DMM EEVBlog 121GW



This meter is partly specified by Dave from EEVBlog and made by UEI, it is packed with function, including some unique ones.



The meter arrived in a white cardboard box with very little text on it.



Inside was the pouch with the meter in it.



The box included the meter, two probes, a thermocoupler, batteries, pouch and a Certificate of Conformity. There is no manual, it must be downloaded from the EEVBlog website.




Probes are branded with B.T.C. and are rated for up to CAT IV 1000V. The meter is “only” CAT III 600V.





The tip has 3 different configurations.



The plug is fully shrouded and standard probe plug size.




A standard thermocoupler with a standard dual banana connector.



The meter is heavy and the tilting bale can hold it while the range switch is used and when the buttons is pressed carefully.



The meter is rather thick.























There is a micro SD card next to the fuse, it is used for firmware updating, for logging and the calibration can be stored on it.



Display



The above picture shows all the segments on the display.



Normal DC voltage with voltage, bargraph and temperature. The secondary display will often shows meter temperature.



Battery voltage, it requires one or more presses on SETUP to display it.



A configuration options (Auto Power Off), to change it: Hold SETUP down until it blinks, then use arrows to change it, hold SETUP to save value.



Burden voltage, it is in mV, but the m is placed a bit far from the V.

The secondary display has a couple of functions:

• Meter internal temperature (Ambient temperature)
  
• Frequency in VAC and mVAC mode.
  
• dBm in VAC mode.
  
• Optional burden voltage in current modes
  
• Volt and current in VA modes (Toggles between them).
  
• Diode test voltage, either 3V or 15V
  
• Entries when logging to card or displaying data
  
• Configuration settings.
  

• Range: Switch to manual range and select range, hold down to activate automatic ranging again. In diode mode it will switch to 15V diode test
  
• Hold: Freeze the display, press again to for automatic hold when reading is table and press a 3. time for to return to normal mode.
  
• REL: Store current reading and show further readings relative to this value. Hold down to active LPF in VAC.
  
• 1msPeak: Capture peak voltage, this only work in VAC where it will capture a positive or negative peak, result is without any sign. Hold down to turn bluetooth on.
  
• Mode: Select the red function on the rotary switch (These selection are remembered). Hold down to turn background light on.
  
• Min/Max: Capture min/max/avg values, there is a position to show actual value. Hold down to disable.
  
• Mem: Press to see saved values, hold down to start logging. Time interval is changed in configuration.
  
• Setup: Controls secondary display and configuration, hold down to change and hold down to confirm changes.
  

• Off: Meter is turned off.
  
• LowZ: Low impedance voltage measurement, meter is fixed in 600V range and can measure both AC and DC.
  
• V: Voltage DC, AC, AC+DC, in AC it is possible to show dBm on secondary display (Use SETUP)
  
• mV, Temp: Millitvolt DC, AC and temperature from thermocoupler
  
• Hz: Frequency, 1/frequency (ms) and duty cycle.
  
• : Resistance, continuity, diode and capacity. Use the RANGE switch for 15V diode test.
  
• mVA/VA: Volt Ampere for DC and AC, this function requires connections to both volt and current terminals on the meter.
  
• uA/uVA: Micro ampere and micro volt ampere for both DC and AC
  
• A/mA: Milli ampere and ampere for AC and DC.
  
• Off: Meter is turned off.
  

• A 500mA: The high mA range and the A ranges, also used for VA.
  
• mAuA: The lower current ranges, also used for VA.
  
• CON: The common terminal for all ranges.
  
• xxx: All other ranges including VA and burden voltage.
  

• Volt and frequency
  
  
  
  • Frequency input will trigger on 1V rms as long as the average voltage is within +/- 2.3V
    
  • At 1Vrms frequency input range is from 1Hz to 1MHz
    
  • Duty cycle works from 10% to 93% at 100kHz with 4Vpp, precision is within 1.6
    
  • Duty cycle works from 1% to 99% at 10kHz with 4Vpp, precision is within 0.3
    
  • The ms reading do not show pulse width, it is 1/frequency.
    
  • 1 VAC is 5% up at 134kHz (RMS will not work at the frequency).
    
  • 1 VAC with LPF (1kHz) is 5% down at 520Hz.
    
  • Pressing the SETUP key will show dBm on the secondary display in AC.
    
  • Max/min needs about 490ms to capture a voltage.
    
  • Peak needs about 0.9ms to capture a voltage, it only captures a peak without sign and only in AC mode.
    
  • Input impedance is 10-11Mohm on DC and 10Mohm on AC, AC+DC will switch between the two.
    
  • mV DC/AC has 10Mohm input impedance up to about 2V, then it drops to a two kOhm
    
  • Frequency input is a few Mohm up to 2 volt then it drops to 2kohm
    
  • LowZ can show both AC and DC voltage, but requires at least 12V.
    
  • Rated overload protection is 600VDC/VAC.
    
  
  
• Current
  
  
  
  • For best precision REL must be used in the low ranges (55uA, 5.5mA, 550mA), due to internal offset in the meter, this disables auto range.
    
  • 10A range will show “OFL” above 11A
    
  • Ampere ranges are not the usual distribution, the A terminal has 3 ranges (0.5A, 5A, 10A), this means the meter has one more current range than is typical.
    
  • The meter can display burden voltage on secondary display (Hold SETUP, press arrow, hold SETUP, press SETUP), the value is in mV.
    
  • The meter can measure VA (Volt x ampere), the secondary display will toggle between current (mA/A) and voltage, the primary display will show VA
    
  • The VA ranges only works up to 55V.
    
  • Overload protection in uA and mA: 0.4A/600V or 0.44A/600V 6×32mm fuse
    
  • Overload protection in A: 11A/1000V 10×38mm fuse
    
  • There is an audible warning when using non current ranges with a probe in current terminals
    
  
  
• Ohm, continuity, diode and capacity
  
  
  
  • Ohm needs about 4.5s to measure 100ohm
    
  • Ohm is 2.5V open and 0.57mA shorted
    
  • The Mohm ranges are very sensitive and will jump a bit around.
    
  • Continuity is quick (about 25ms).
    
  • Continuity beeps when resistance is below 30ohm (30ohm setting) and 300ohm (300ohm setting)
    
  • Continuity has selection between 30ohm, 300ohm shorted or open in SETUP menu.
    
  • Continuity is 2.1V open and 0.57mA shorted
    
  • Diode range 3V uses 3.2V, max. display is 3.0000V at 0.05mA, max. current is 0.84mA shorted
    
  • Diode range 15V uses 15.5V, max. display is 15.000V at 0.23mA, max. current is 4.7mA shorted
    
  • 10uF takes about 4 seconds to measure.
    
  • 9000uF takes about 16 seconds to measure.
    
  • Rated overload protection is 600VDC/VAC
    
  
  
• Miscellaneous
  
  
  
  • Current consumption of meter is 5mA-6mA (17mA with backlight)
    
  • Bluetooth adds about 5mA to current consumption.
    
  • Build-in battery voltmeter is about 0.2V too low on my meter.
    
  • Meter works down to 1.7V where it turns off, battery symbol is show at 4.3V (4.0V on internal meter).
    
  • The meter reading is stable down to 3.8V where it starts to show wrong values.
    
  • Backlight start to fade at 3.5V
    
  • The meter often needs a couple of updates before the reading is fully correct.
    
  • Viewing angle is good
    
  • Display updates around 5 times/sec
    
  • Bargraph updates much faster than number (Probably 30+ times/second).
    
  • Backlight will not turn automatic off
    
  • Will automatic turn power off in about 30 minutes without any warning.
    
  • Standard probes fits perfectly into sockets on meter.
    
  • Firmware can be updated from a microSD card
    
  • Weight is 486g without accessories, but with sleeve and batteries.
    
  • Size is 165 × 84 × 55mm with sleeve.
    
  
  
• Probes
  
  
  
  • Probe resistance 29mOhm for one.
    
  • Probe wire is soft and 100cm long.
    
  
  

DMM UNI-T UT139S



Uni-T has a large selection of DMM in their program, this model exist in A, B, C, E and S versions, In this review I will look at the S version that is the most advanced model (Together with E) and has a inverted LCD display.



The meter arrived in a red box with Chinese writing and the dealer had added a pouch for the meter.



The box contained the meter, probes, thermosensor and a manual in Chinese (I could download a English version).





The probes are branded UNI-T and rated for 10A and 1000V. As usual the CAT rating depends on mounted or unmounted tip cover.



The plug is fully shrouded and the shroud is slightly shorter than standard probes.




The thermocoupler has a single connector to the multimeter end, that is considerable better than the two loose banana plugs.



The tilting bale is just about stable enough to change range and use switches with one hand. The tilting bale is not locked in either position.



The 600mA fuse is accessible from the battery compartment.







The battery lid holds the screw.















Display



The above picture shows all the segments on the display. Due to the way the display works some of the segments can have a fixed color.



Typical display during usage, it will show the number and what measurement is selected.
The circle with arrow shows that auto power off is enabled, hold down SELECT when turning on to disable this.



The electric field detection (NCV) shows from 1 to 4 bar depending on field strength and a red led will turn on together with the buzzer.



Functions



Buttons:

• Range: Switch to manual ranging and will also change range, hold down to get back to automatic
  
• Max/Min: Starts recording min/max values, press the button to change between min/max (Both are saved), hold down to exit.
  
• Rel: Uses the current value as reference and will show all further readings relative to this, will change to manual range.
  
• Hz %: Select Hz and duty cycle display, works on all AC volt and current ranges.
  
• Hold/light (Yellow): Will freeze the display, hold down to turn change brightness of the background light (Reduce it)
  
• Select/LPF(Blue): Selects the ranges printed with blue on the rotary switch.
  

• LoZ: Low input impedance for AC voltage, this connects a PTC across the voltage input.
  
• Off: Meter is turned off
  
• VAC: Show AC voltage, use Select for LPF and “Hz %” for frequency an duty cycle.
  
• VDC: Show DC voltage.
  
• mV: Show DC and AC voltage, use Select for AC and “Hz %” for frequency an duty cycle. This is the high speed frequency input.
  
• ohm: Resistance, continuity, diode and capacitance.
  
• °C: Temperature input, use Select for C/F selection.
  
• uA: Current DC and AC, use Select for AC and “Hz %” for frequency an duty cycle.
  
• mA: Current DC and AC, use Select for AC and “Hz %” for frequency an duty cycle.
  
• A: Current DC and AC, use Select for AC and “Hz %” for frequency an duty cycle.
  
• NCV: Non contact voltage, i.e. electric field.
  

• 10A: High current, it can only withstand 10+ ampere for a short time (Fuse is 10A).
  
• mAuA: The lower current ranges, the selector switch will change between two different shunts (Fuse is 600mA).
  
• COM: The common terminal for all ranges.
  
• xxx: All other ranges, including external current clamp.
  

• Volt and frequency
  
  
  
  • Frequency counter and duty cycle can only be selected in AC ranges.
    
  • Frequency input requires a zero crossing.
    
  • At 0.1Vrms frequency input range is from 0.8Hz to 6MHz
    
  • At 1Vrms frequency input range is from 0.9Hz to 29MHz
    
  • Max/min needs about 380ms to capture a voltage, the function will not capture the full voltage at the first peak, but needs multiple peaks.
    
  • 1 VAC is 5% down at 2.1kHz, rms will not work at this frequency
    
  • 7 VAC is 5% down at 650Hz with LPF
    
  • LPF locks range to 600VAC
    
  • Duty cycle works from 2% to above 99% at 100kHz with 1Vpp, precision is within 0.4 (Mostly 0.1).
    
  • Input impedance is 10-11Mohm on DC and AC
    
  • Input impedance is 11Mohm on mV DC and 5Mohm on mV AC range up to about 1V where it drops to 2kohm at 5V
    
  • Frequency input impedance is 5Mohm at 0.1V, dropping to 2kohm at 5V
    
  • Voltage ranges are rated for 600V DC/AC input.
    
  
  
• Current
  
  
  
  • Frequency counter and duty cycle can only be selected in AC ranges.
    
  • Meter has audible alarm on 10A range when current is above 19A and shows OL above 20A.
    
  • 10A range protected with a 10A/600V 6.3×25mm fuse
    
  • mAuA range is protected with a 0.6A/600V 6.3×32mm fuse
    
  
  
• Ohm, Continuity, diode and capacity
  
  
  
  • Ohm needs about 2.5s to measure 100ohm
    
  • Ohm is 1.0V open and 0.4mA shorted
    
  • Continuity is very fast (About 10ms).
    
  • Continuity beeps when resistance is below 50ohm
    
  • Continuity is 1.0V open and 0.4mA shorted
    
  • Diode range uses 3.3V, max. display is 3.000V at 0.15mA, max. current is 1.7mA shorted
    
  • 70000uF takes about 7 seconds to measure.
    
  • 10uF takes about 4 seconds to measure.
    
  • Range are rated for 600V input.
    
  
  
• Miscellaneous
  
  
  
  • Current consumption of meter is 21mA with normal backlight and 11mA with low backlight
    
  • Meter works down to 2.4V where the display goes dark and the buzzer will warn and turns off, battery symbol show at 2.6V.
    
  • Backlight is fairly stable until display turns off.
    
  • Reading is stable with varying battery voltage.
    
  • The meter usual need a couple of display update to reach the final value.
    
  • Viewing angle is good, except from top
    
  • Display updates around 3 times/sec
    
  • Bargraph updates at the same speed as the numbers.
    
  • Backlight is always on and has two brightness levels, default is high.
    
  • Will automatic turn power off in about 15 minutes.
    
  • Standard probes fits fine, but cannot be seated fully.
    
  • Weight is 365g without accessories, but with batteries and sleeve.
    
  • Size is 176 × 81 × 48mm with sleeve.
    
  
  
• Probes
  
  
  
  • Probe resistance 38mOhm for one
    
  • Probe wire is soft and 88cm long.
    
  
  

DANIU 1M 4mm Banana Plug to Alligator Clip



Official specifications:

• Color: Blue,Black,Red,Green, Yellow
  
• Material: Copper
  
• Plug size: 4mm
  
• Suitable For: Testing
  
• Length: 1M
  

DMM Keysight 34461A 6½ digit



This is a fairly expensive 6½ digit bench multimeter from a top quality brand.
This meter has many possibilities and I will not cover everything it can do.



It arrives in a big very solid cardboard box with the DMM well protected inside and a box with all the accessories.
It includes a calibration certificate, this list the reading and the error at many different calibration points and the date this was measured.



In the accessories box is probes, mains cable, CD with manual and a bit of documentation. The manual can be downloaded from Keysight (It is nearly 600 pages in English).



The probes includes a few accessories.



Standard probe, note that this probe is a fairly low safety rating, like the DMM (CAT II).



With extended probe tip.



With hook.



There is two types of hooks included.





The meter can be used in multiple position, the flat position is often used to stack it with other equipment. It can also be used floor standing. It is possible to buy a bracket for mounting one or two meters in a rack.



The front has the display, the buttons and one set of inputs.




On the back is another set of input and a few other connections, including the mains input.
There is also a cover for the optional GPIB interface.



Display




This meter is a computer that needs some time to boot and do self test, during that time it shows a couple of boot screens.



Typical display when measuring without any of the more advanced stuff activated.



Secondary display enabled and showing AC (When showing DC & AC a relay inside the meter will toggle). The statistic can show max/min/average and a bit more.



A bar can be added to the display.



There is also some modes where it shows the data graphically.



Ohm can be done both as two wire or four wire, difference here is about 30mOhm due to the cables.



Functions

• DCV/DCI: Select DC voltage or DC Ampere if Shift is pressed first.
  
• ACV/ACI: Select AC voltage or AC Ampere if Shift is pressed first.
  
• Ohm2W/Ohm4W: Select ohm with two wire or with four wire if Shift is pressed first.
  
• Freq/Capacity: Select frequency or capacity if Shift is pressed first.
  
• Cont/Diode: Select Continuity or diode if Shift is pressed first.
  
• Temp: Select temperature measurement (This do not support thermocouplers).
  
• Run/stop/reset: Start/stop measuring or reset meter to factory settings if Shift is pressed first.
  
• Single/Probe Hold: Take a single measurement (Used after stop is pressed) or enable auto hold if Shift is pressed first.
  
• Null/Math: Enable relative measurement or min/max/average (Math can do more than that) if Shift is pressed first.
  
• Display/Utility: Modify display with bargraph, trend chart or second display. If Shift is used it is possible to change configuration.
  
• Acquire/Help: Trigger, number of measurements, saving of measurements. There is also some help available (Holding any key down will show help for that key).
  
• Shift: Select the function listed above the key.
  
• Arrows: Adjust settings.
  
• Select: Select value adjusted with arrows.
  
• +/range/-: Shortcut to select manual/auto range and select range.
  

• Input HI: The voltage, frequency, capacity, diode and ohm positive input.
  
• Input LO: The voltage, frequency, capacity, diode and ohm negative input.
  
• Sense HI: Four terminal ohm and voltage ratio positive input.
  
• Sense LO: Four terminal ohm and voltage ratio negative input.
  
• 3A: Low current range, it is not recommend to use it up to 3A, it has very high burden voltage.
  
• 10A: High current range.
  
• Switch: Select between this set of input terminals and the rear terminals.
  

• Volt and frequency
  
  
  
  • At 10mVrms frequency input range is from 1Hz to 490kHz
    
  • At 1Vrms frequency input range can be stretched to 920kHz
    
  • Frequency input do not require a zero crossing.
    
  • 1 VAC is 5% down at 320kHz, rms will not work at this frequency
    
  • Frequency can be selected as secondary display in AC ranges.
    
  • AC voltage can be selected as secondary display in DC ranges (A relay will toggle).
    
  • Input impedance is 10Mohm on DC and AC
    
  • DC ranges below 12V can be set to high impedance.
    
  
  
• Current
  
  
  
  • AC current can be selected as secondary display in DC ranges (A relay will toggle).
    
  • Frequency can be selected as secondary display in AC ranges.
    
  • The 3A range is for combability with an old model, use 10A instead.
    
  • 3A and 10A ranges is protected by two 11A/1000V 10×38mm fuse.
    
  • 3A and lower ranges is protected with a 3.15A/500V 5×20mm time delay ceramic fuse in addition to the large fuse.
    
  
  
• Ohm, Continuity, diode and capacity
  
  
  
  • Ohm needs about 1.2s to measure 100ohm in default configuration.
    
  • Ohm is 10.7V open (100M range is 5V) and 1mA shorted
    
  • Continuity is very fast (Less than 3ms).
    
  • Continuity beeps when resistance is below 10ohm.
    
  • Continuity is 10.7V open and 1.0mA shorted
    
  • Diode range uses 10.7V, max. display is 5.0V at 1.0mA, max. current is 1.0mA shorted
    
  
  
• Miscellaneous
  
  
  
  • Power consumption when on 9 watt
    
  • Power consumption when off 0.5 watt
    
  • The meter reach final value in one to two readings.
    
  • Viewing angle is good.
    
  • Display update speed depends on settings.
    
  • Maximum measuring speed is 1000 readings/second (At high speed it will have less digits).
    
  • Weight is 3760g without accessories.
    
  • Size is 300 × 262 × 105mm
    
  
  
• Probes
  
  
  
  • Probe resistance 22mOhm for one.
    
  • Probe wire is very soft and 120cm long.
    
  
  

DANIU 1M 4mm Banana to Banana Plug Shrouded P1050



Official specifications:

• Color: Blue,Black,Red,Green, Yellow
  
• Current: 20A
  
• Voltage: 2000V
  
• Plug size: 4mm
  
• Length: 1M
  
• Wire gauge: 1mm2
  

DMM UNI-T UT61E



This is a old UNI-T multimeter and I have looked at it before, but I wanted to update the review to same standard as my current multimeter reviews. For the review I bought a new UT61E from China, this way I can also see if the protection in the Chinese version has been upgraded (The EU version has upgraded protection).



There are 5 meters in the UT61 series and the box do not show the E model or list any specifications.



In the box was the meter, the probes, A RS232 cable, a CD with software and a manual (Both software and manual can be downloaded).




Probes are branded UNI-T and rated for 20A. They do not include tip covers, this means the CAT III & CAT IV rating is wrong.



The plugs are fully shrouded, the shroud is a bit short




On this meter this adapter can be used when testing resistors and diodes, it uses the mAuA terminal as ground, this will add about 0.4ohm error to ohm measurements.



The meter is heavy enough to keep it stable while turning the range switch, this means it can easily be used with one hand, either lying flat or standing.














Display



All the segments are shown during power on, not all of them are used.



Typical display during usage, it will show the number and selected measurement. The communication marker is always on.



Functions



Buttons:

• Hold: Will freeze the display reading, until pressed again
  
• Range: Select manual range and change range, hold down to reactivate automatic ranging.
  
• Rel: Shows values relative to current value, will also select manual range. Press again to disable.
  
• Peak: Capture very fast min/max values, will also select manual range. Hold down to disable.
  
• (Yellow): Select frequency/duty cycle in AC voltage and current modes.
  
• (Blue): Select AC/DC in voltage and current mode, in ohm mode it will change between ohm/continuity/diode
  

• Off: Meter is turned off
  
• V: DC and AC voltage, use blue button to change and yellow button for frequency.
  
• mV: DC and AC millivolt, use blue button to change and yellow button for frequency.
  
• : Ohm, continuity and diode.
  
• : Capacitance.
  
• Hz: Logical frequency input.
  
• uA: Micro ampere DC or AC, use blue button to change and yellow button for frequency.
  
• mA: Milli ampere DC or AC, use blue button to change and yellow button for frequency.
  
• A: Ampere DC or AC, use blue button to change and yellow button for frequency.
  

• 10ADC: 10A DC current input.
  
• uAmA: Micro and milliampere input.
  
• COM: The common terminal for all ranges.
  
• xxx: All other ranges.
  

• Volt and frequency
  
  
  
  • 1V AC reading is 5% up at 38kHz, rms will not work at that frequency
    
  • Frequency input do not require a zero crossing, it can handle average from an about -4.5V to more than 8.5V with 1Vrms input.
    
  • At 1Vrms frequency input range is from 3Hz to 78MHz
    
  • Duty cycle works from 10% to 95% at 10kHz with 1Vpp, precision is within 1.2.
    
  • Duty cycle works from 5% to 95% at 100kHz with 4Vpp, precision is within 0.5.
    
  • Meter has audible alarm when V range is on overload (OL), not mV.
    
  • Peak max/min needs about 0.1ms to capture a voltage, with very short pulses it need a few.
    
  • Input impedance is 10-11Mohm on DC and AC
    
  • mV DC/AC is high impedance below 3V, then drops
    
  • Maximum voltage is 1000VDC 750VAC
    
  
  
• Current
  
  
  
  • 10A range is fused with a 10A/240V 6.3×25mm fuse
    
  • mAuA range is fused with a 1A/240V 6.3×25mm fuse
    
  • Meter has audible alarm when range is on overload (OL)
    
  
  
• Ohm, continuity, diode and capacity
  
  
  
  • Ohm needs about 1.2s to measure 100ohm
    
  • Ohm voltage is -0.39V open and -1.6mA shorted.
    
  • Continuity is very fast (About 3ms).
    
  • Continuity beeps when resistance is below 30ohm.
    
  • Continuity is -3V open and -1.6mA shorted
    
  • Diode range uses 2.9V, max. display is 1.8999V at 0.6mA, max. current is 1.9mA shorted
    
  • 10uF takes about 0.6 second to measure.
    
  • 70000uF takes about 13 seconds to measure.
    
  • Overload protection is 1000VDC 750VAC
    
  
  
• Miscellaneous
  
  
  
  • Current consumption of meter is between 1.5 and 4mA, typically around 2.5mA, duty cycle in voltage and current is 4mA
    
  • Meter turns off at 1.6V, battery symbol show at 5.5V.
    
  • Readings will be correct until meter turn off.
    
  • Viewing angle is good
    
  • Display updates around 2 times/sec
    
  • Bargraph updates faster than numbers.
    
  • Meter will not automatic turn off, due to the always enabled computer connection.
    
  • Standard probes fits.
    
  • The meter usual shows the correct value at second update.
    
  • Weight is 352g without accessories, but with battery.
    
  • Size is 180 × 88 × 44mm
    
  
  
• Probes
  
  
  
  • Probe resistance 43mOhm for one.
    
  • Probe wire are 93cm long.
    
  
  

Just received this little beauty and for my first post I thought I would share:

DMM Aneng AN302



The brand Aneng has a lot of cheap multimeters, most of them fairly good. This meter is a pocket meter, except that is missing a compact pouch for pocket use.



I got the meter in the usual black plastic bag with some protective wrapping around the pouch.



The pouch with the meter in it, it will fit in a large pocket.



I got the following pieces: the DMM, a pouch, a lanyard and a instruction sheet.



The probes a small and without tip cover, that means CAT II. They are marked 250V and the meter is marked 600V, this do not really match up with non-replaceable probes.



The meter do not have a range switch, only buttons, this means it will never slide around when selecting range.



But the buttons can get stuck, I also had the FUNC switch non-working a couple of times, but could get it working again without opening the meter.







Replacement of battery requires removal of small 3 self tappers, it will probably limit the number of times it is possible to replace the battery.



The meter do not have background light, instead it is a flashlight.



Display



The above picture shows all the segments on the display, most are used by this meter.



Typical display during usage, it will show the number and what measurement is selected.



The NCV is the usual bars, the buzzer and the flashlight.



Functions



Buttons:

• Hold: Freezes the display, hold down to turn flashlight on/off.
  
• Range: Will disable auto range and change range, hold down to activate auto range.
  
• Rel: Shows values relative to current value, will also select manual range. Press again to disable.
  
• Select (Yellow): Select ranges, see below.
  
• Func (Blue): Select between the two modes, there is no indication on what mode is selected, this must be inferred based on selected range.
  

• Volt and frequency
  
  
  
  • At 100mVrms input frequency range is from 1Hz to 5.6MHz in mV mode.
    
  • At 1Vrms input frequency range can be stretched to 6.2MHz in mV mode.
    
  • At 1Vrms input frequency range is from 1Hz to 30kHz (Above that the display gets unstable) in V mode.
    
  • At 5Vrms input frequency range can be stretched to 80kHz in V mode.
    
  • 1 VAC is 5% down at 2.1kHz (RMS will not work at the frequency).
    
  • Frequency input requires a zero crossing in both mV and V mode.
    
  • Input impedance is 10..11Mohm on DC and AC
    
  • mVDC range is high impedance for DC up to around 1.5 volt where it drops to 2kOhm. AC is similar, but capped at 10Mohm
    
  • mV frequency input is 10Mohm up to around 1.5 volt, then the protection clamps to 2kOhm
    
  • V frequency input is 10..11Mohm.
    
  
  
• Current
  
  
  
  • Meter cannot measure current
    
  
  
• Ohm, Continuity, diode and capacity
  
  
  
  • Ohm needs about 2.8s to measure 100ohm
    
  • Ohm is 1V open and 0.4mA shorted
    
  • Continuity is quick (About 30ms, but mostly 5ms).
    
  • Continuity beeps when resistance is below 50ohm.
    
  • Continuity is 1V open and 0.4mA shorted
    
  • Diode range uses 3.2V, max. display is 3.000V at 0.13mA, max. current is 1.8mA shorted
    
  • 10uF takes about 4.5 seconds to measure.
    
  • 70000uF takes about 12 seconds to measure.
    
  • Overload protection is not rated
    
  
  
• Miscellaneous
  
  
  
  • Current consumption of meter is 1.5 to 1.9mA depending on range with flashlight it is up to 15mA.
    
  • Meter works down to 2.2V where it turns off, battery symbol shows at 2.4V.
    
  • Reading do not change with battery voltage.
    
  • Flashlight only works down to about 2.6V where it is fairly dim.
    
  • The meter usual need a couple of display update to reach the final value.
    
  • Viewing angle is good.
    
  • Display updates around 3 times/sec
    
  • Flashlight will not turn off automatic, but will turn off when meter automatic turns off.
    
  • Will automatic turn power off in about 15 minutes.
    
  • Weight is 74g without accessories, but battery.
    
  • Size is 119 × 63 × 13mm width includes bent strain relief for probes.
    
  
  
• Probes
  
  
  
  • Probe wire is soft, fairly thin and 70cm long.
    
  
  

Power supply frontend DPS5020-USB 50V/20A with Bluetooth and USB interface



This device is the front end for a power supply, it must be supplied with low voltage DC power (Up to 60V).
Official specifications:

• Input voltage range: 6.00-60.00V
  
• Output voltage range: 0V-50.00V
  
• Output current: 0-20.00A
  
• Output power range: 0-1000W
  
• Product Weight: about 222g
  
• Display module size: 79*43*38(mm) (L*W*H)
  
• Cutout size: 71mm*39mm
  
• Power module size: 93*71*41(mm) (L*W*H)
  
• Length of connecting line: 200mm
  
• Fixed hole center distance: 86mm, 64mm
  
• Output voltage resolution: 0.01V
  
• Output current resolution: 0.01A
  
• Output Voltage accuracy: ± (0.5% + 1 digit)
  
• Output Current accuracy: ± (0.5% + 2 digits)
  

• Application will show an ad for another RD product when started.
  
• Application is not on Google.
  
• RD uses a file download service that opens ads in minimized windows.
  
• Protocol is documented.
  

• Application is a 240MB download
  
• Inside the archive is manuals, a font, a driver and another archive with the program
  
• Application is very slow to install.
  
• The screen is a fixed size (1062 × 619 pixels), there is no resize options.
  
• RD uses a file download service that opens ads in minimized windows.
  
• Protocol is documented.
  

DMM Bside ADM92



This meter has the shape of a clamp meter, but it a normal multimeter, that can also work as a pen meter



The meter is in a brown cardboard box with a label that shows the model and a few specifications.



It included the DMM, a pouch, a pair of probes, a thermocouples and a instruction manual.



Everything could fit in the supplied pouch.




The thermocoupler is standard cheap K type with lose banana plugs.





Probes are branded with BSide and has removable tip covers. There is a CAT III 1000V rating on the cover, but none on probe.



The plug is fully shrouded and very close standard probe shroud size.









The slot at the side of the meter can hold one probe and the the meter works as a pen type meter.











When I got the meter something was rattling inside it, it was the NCV antenna. I soldered it back in place before doing any testing.
It was probably not soldered good enough and fall off due to a bump during shipping.




Display



The above picture shows all the segments on the display, not all are used.



Typical display during usage, it will show the main number and what measurement is selected.



NCV has the usual bars on the display, together with a red led and the buzzer.



The LIVE function requires one probe, shows 4 bars when not connected and LIVE when touching a live wire. Buzzer and led is also used for this function.



The led for LIVE and NCV function is here.




Functions



Buttons:

• Hold: Freezes the display, hold down for backlight.
  
• Hz: Will change to frequency in AC ranges.
  
• SEL: Select between DC and AC and ohm, continuity, diode and capacitance. For temperature is will select between C and F.
  
• V Alert: Activates the NCV mode, works on any rotary switch position except off. Pressing again or turning the rotary switch will exit NCV mode.
  

• Live: Detect a live wire with one probe.
  
• Off: Meter is turned off
  
• V: Show DC or AC voltage.
  
• : Resistance, continuity, diode and capacitance.
  
• mA: The two mA current ranges.
  
• : Temperature.
  

• Volt and frequency
  
  
  
  • Frequency counter is only available on AC ranges
    
  • Frequency input requires a zero crossing
    
  • At 0.1Vrms input frequency range is from 10Hz to 5.6kHz
    
  • At 1Vrms input frequency range is from 1Hz to 45kHz
    
  • 1 VAC is 5% down at 2.3kHz (RMS will not work at the frequency).
    
  • Input impedance is 10-11Mohm on DC and AC
    
  • Rated overload protection is 1000VDC and 750VAC
    
  • Frequency input resistance is same as voltage, except at very low voltages where it is high
    
  
  
• Current
  
  
  
  • mA do not have a fuse but uses some PTC’s
    
  • Will show OL above 200mA
    
  
  
• Ohm, continuity, diode and capacitance
  
  
  
  • Ohm needs about 2.8s to measure 100ohm
    
  • Ohm is -1.1V open and -0.3mA shorted
    
  • Continuity is quick (About 15ms).
    
  • Continuity beeps when resistance is below 50ohm
    
  • Continuity is -2.1V open and -0.3mA shorted
    
  • Diode range uses 4.0V, max. display is 3.300V at 0.36mA, max. current is 2.1mA shorted
    
  • 10uF takes about 2 seconds to measure.
    
  • 9900uF takes about 9 seconds to measure.
    
  • Rated overload protection is 600V DC or AC
    
  
  
• Miscellaneous
  
  
  
  • Current consumption of meter is 1.5mA to 1.7mA, with backlight it is 5.2mA
    
  • Meter works down to 2.2V where it turns off, battery symbol show at 2.3V.
    
  • Meter readings are stable until it turns off.
    
  • Backlight fades with voltage and is very dim at 2.5V
    
  • The meter usual show correct reading on first or second display update.
    
  • Viewing angle is good, except from top
    
  • Display updates around 3 times/sec
    
  • Backlight turn off after about 30 seconds.
    
  • Will automatic turn power off in about 16 minutes.
    
  • Banana plugs and standard probes fits nicely.
    
  • Weight is 118g without accessories, but with batteries.
    
  • Size is 140 × 49 × 33mm.
    
  
  
• Probes
  
  
  
  • Probe resistance 185mOhm for one.
    
  • Probe wire is 78cm long.
    
  
  

DMM Mustool MT8206



This is a DMM that can also show waveforms.




I got the meter in a cardboard box with specifications on it.



It included the DMM, a pair of probes, a bag and a manual.





The probes are without tip covers, i.e. they are only CAT II rated.



The plug is fully shrouded, but is slightly smaller than standard probe plug size.



Both meter and tilting bale is smooth, this makes it difficult to use the meter one handed.



The bag can fit both meter and probes, but feels a bit tight when doing it (Meter fits easily in it).









Battery lid uses do not use a screw, is clipped on and has instruction on how to insert batteries (Centre battery last).







Display




The power on screen shows four lines. The screen always uses background light, this gives it a good contrast.



The display will usual show the value and unit, together with a bargraph.
The display is a graphic display, this gives some flexibility with showing symbols and units.



The display have a log of saved values.



And it can show waveforms.



Functions



Buttons:

• DIS/Auto: Manual range, hold down to reactivate auto range. When held down in auto range the waveform display will be shown.
  
• REL: Remember current value and show values relative to this, this function is indicated with a triangle on the display.
  
• SELE: Change between ohm, diode, continuity and capacity in ohm mode and DC, AC in current modes.
  
• HOLD/DS: Freeze the display value and store a value/chart, press again to release. Hold down this key to enter the log.
  
• : Use for page up/down when showing recorded data and for adjusting time in waveform display.
  

• Off: Meter is off.
  
• mV: DC mV range
  
• VDC: DC volt range
  
• VAC: AC volt and mV range, mV must be selected manually.
  
• Hz%: Frequency and duty cycle.
  
• : ohm, diode, continuity and small capacity (Max. 100uF)
  
• mF: Large capacity, up to 10000uF
  
• mA: milliampere, use SELE to select between DC and AC
  
• A: Ampere, use SELE to select between DC and AC
  
• Off: Meter is off.
  

• 10A: High current.
  
• mACx: The lower current ranges, large capacitor +
  
• xxx: All other ranges.
  
• CON: The common terminal for most ranges, large capacitor is excluded from this.
  

• Volt and frequency
  
  
  
  • At 1Vrms frequency input range is from 0.6Hz to 560kHz
    
  • At 2Vrms frequency input range can be stretched to 1.2MHz, to reach the specified 5MHz the input voltage must be 7Vrms
    
  • Frequency counter works with at least +/-8.5V offset with 1Vrms input
    
  • Duty cycle works from 10% to 95% at 10kHz with 4Vpp, precision is within 2.5
    
  • Duty cycle works from 1% to 99% at 1kHz with 4Vpp, precision is within 1.8
    
  • 1 VAC is 5% down at 63kHz
    
  • Input impedance is 10-11Mohm on DC, AC and mVAC
    
  • Input impedance on mVDC is high
    
  • mVAC must be manually selected
    
  • Frequency input varies in impedance at low voltage, but at 20V it is down to 2kOhm
    
  • There is audible alarm on overload on any voltage range.
    
  • There is a short beep and high voltage indicator turns on when voltage goes above 24VAC or 24VDC
    
  • Maximum voltage is 1000VDC and 750VAC, for frequency input it is 380V
    
  
  
• Current
  
  
  
  • mA protected by 0.5A/250V probably a PTC
    
  • A is protected a 10A/250V SMD fuse
    
  • There is audible alarm on overload on current ranges, except 10A range!
    
  
  
• Ohm, Continuity, diode and capacitance
  
  
  
  • Ohm needs about 4s to measure 100ohm
    
  • Ohm is 0.43V open and 0.23mA shorted
    
  • Continuity is 0.43V open and 0.23mA shorted
    
  • Continuity is moderate in speed (About 120ms).
    
  • Continuity beeps when resistance is below 100ohm .
    
  • Diode range uses 1.5V, max. display is 0.999V at 0.25mA, max. current is 0.73mA shorted
    
  • 10uF takes about 3.4 seconds to measure.
    
  • Lower capacity selection goes to 100uF
    
  • mF is protected by a PTC and a TVS diode.
    
  • 100uF takes about 18 seconds to measure in low capacity selection.
    
  • 100uF takes about 4 seconds to measure in high capacity selection.
    
  • 11000uF takes about 18 seconds to measure in high capacity selection (Display shows about 9.200mF).
    
  • Measuring large capacity values flashes empty battery symbol sometimes.
    
  • There is audible alarm on overload on capacitance range
    
  • Ohm and capacity input is rated for 250VDC/AC overload.
    
  
  
• Miscellaneous
  
  
  
  • Current consumption of meter is 33mA
    
  • Display is too dark to read at 2.6V, battery symbol show at 2.9V.
    
  • Meter reading is stable while display is readable.
    
  • Backlight starts to fade at 3.8V
    
  • The meter will usual show the correct value after two display updates and a update for each range step.
    
  • Viewing angle is good, except from the top
    
  • Display updates slightly below 2 times/sec
    
  • Bargraph updates at same speed as display.
    
  • Will automatic turn power off in about 15 minutes.
    
  • Standard probes cannot be fully seated (Maybe 4mm stick up)
    
  • Weight is 256g without accessories, but with batteries.
    
  • Size is 160 × 82.5 × 37mm.
    
  
  
• Probes
  
  
  
  • Probe resistance 92mOhm for one.
    
  • Probe wire is soft and 82cm long.
    
  
  

DMM Keithley DMM6500 6½ digit



This is a fairly expensive 6½ digit bench multimeter from a top quality brand.
This meter has many possibilities and I will not cover everything it can do.



It arrives in a big very solid cardboard box with the DMM well protected inside.



It includes a calibration certificate stating that the meter is in calibration, mains cable, a pair of probes and a usb cable. It do not include any manuals, they must be downloaded (Reference manual is 1200 pages).



The meter included 3 mains cable, none of them are a perfect match for the normal Danish socket, but the Schuko works.




Standard probe, note that this probe is a fairly low safety rating, like the DMM (CAT II).



The plug is fully shrouded.



The front has the display, the buttons and one set of inputs.



The meter can be tilted, but in one angle only.




The vent holes for the fan are on the sides.




The back, there was a warning to check the mains voltage.





Both back and front connectors has a cheap and easy replaceable fuse for the 3A input, inside is a large HRC fuse.



The front and back bumpers can easily be pulled off.



Behind the front bumper is screw holes for rack mounted brackets (All high end bench meters can be mounted in a rack).



Display



This meter is a computer that needs some time to boot and do self test, during that time it shows the brand name. At first only the name and later in the sequence it adds a background image and a bar. Total time is about 15 seconds.



Typical display when measuring without any of the more advanced stuff activated. Here I am measuring one of my precision resistors in 4 terminal mode (The meter is probably more precise than the resistor).



Secondary display enabled and showing AC.



Just about any measurement can be used for secondary display, but many of them means a relay will be toggling inside the meter.
Not all combinations of main and secondary are meaningful, but they can be selected and the meter will do it.



The statistic can show max/min/average and a bit more.



It is possible to include a chart on the display.



It can be expanded to cover the full screen.
When in this state it is possible to enable cursors to measure value and time.



When using the digitize function the meter samples very fast, this is a 100kHz sine wave. This fast sampling can be done in either voltage or current mode, this means that capturing a 10us current pulse is possible.
To change scale use two fingers on the screen to contract or expand the view.



And a 10kHz square wave.



The usual table view is also present, it is possible to click on a entry to get some parameters.



The usual histogram is also present, it support panning and zooming. The maximum number of bins are 700.



Functions

The buttons do not say much about the function in the meter, because most of the user interface is done with the touch screen.

• HOME: One press will return to the measured value display, two pressed will return to the measured values with the function selection below.
  
• MENU: The menu screen with icons for all the different configurations and functions.
  
• APPS: Applications, this is not the same as scripts, but made in the same language.
  
• HELP: Shows a help screen for the selected item/function.
  
• ENTER: Activate the button with a yellow square around (Generally not very useful on this meter).
  
• EXIT: Leave a menu/function.
  
• FUNCTION: Select range, this is basically the same as the selection below the readout.
  
• TRIGGER: Used to manually trigger a measurement or measurement sequence.
  

• Input HI: The voltage, frequency, capacitance, diode and ohm positive input.
  
• Input LO: The voltage, frequency, capacitance, diode and ohm negative input.
  
• Sense HI: Four terminal ohm and voltage ratio positive input.
  
• Sense LO: Four terminal ohm and voltage ratio negative input.
  
• 3A: Low current range, it is not recommend to use it up to 3A, it has fairly high burden voltage. There is a fuse inside the terminal.
  
• Switch: Select between this set of input terminals and the rear terminals.
  

• Input HI: The voltage, frequency, capacitance, diode and ohm positive input.
  
• Input LO: The voltage, frequency, capacitance, diode and ohm negative input.
  
• Sense HI: Four terminal ohm and voltage ratio positive input.
  
• Sense LO: Four terminal ohm and voltage ratio negative input.
  
• 3A: Low current range, it is not recommend to use it up to 3A, it has fairly high burden voltage. There is a fuse inside the terminal.
  
• 10A: High current range, this has a large fuse behind the lid above.
  
• Switch: Select between this set of input terminals and the rear terminals.
  

• Volt and frequency
  
  
  
  • At 10mVrms frequency input range is from 1.5Hz to 720kHz
    
  • At 1Vrms frequency input range can be stretched to 1MHz
    
  • Frequency counter works with at least +/-8.5V offset with 10mVrms input
    
  • 1 VAC is 5% down at 390kHz, rms will not work at this frequency
    
  • Period is 1/frequency, it do not show high/low period time.
    
  • Meter can show dB(m) with any reference voltage or a any reference impedance between 1ohm and 10kOhm.
    
  • Input impedance is 10Mohm on DC, but only 1.1Mohm on AC with AC coupling (The 10Mohm DC resistance still applies).
    
  • Frequency input is similar to AC input.
    
  • DC ranges below 12V can be set to high impedance.
    
  
  
• Current
  
  
  
  • 3A and lower ranges is protected with a 3.15A/250V 5×20mm glass fuse accessible from outside.
    
  • 3A and lower ranges is also protected by a 3.6A/1000V 10×38mm fuse inside the meter.
    
  • 10A range is protected by a 11A/1000V 10×38mm fuse behind a lid.
    
  
  
• Ohm, Continuity, diode and capacitance
  
  
  
  • Ohm needs about 0.2s to measure 100ohm in default configuration.
    
  • Ohm is up to 12.9V open and 10.0mA shorted
    
  • Continuity is very fast (Less than 4ms) because it uses 4½ digit mode.
    
  • Continuity beeps when resistance is below 10ohm, this is adjustable.
    
  • Continuity is 9.3V open and 1.0mA shorted
    
  • Diode range uses 9.3V, max. display is 7.0V at 1.0mA, max. current is 1.0mA shorted (Current is adjustable).
    
  • 10uF takes about 0.3 seconds to measure in default configuration.
    
  • 100uF takes about 0.4 seconds to measure in default configuration.
    
  
  
• Miscellaneous
  
  
  
  • Power consumption when on is 22 watt
    
  • Power consumption when off is 5.7 watt
    
  • There exist a multiplexer card with 10 inputs, it uses the rear inputs on the meter.
    
  • The meter reach final value in one to two readings.
    
  • Viewing angle is good.
    
  • Display update speed depends on settings.
    
  • Maximum measuring speed is 21000 reading/seconds and 1000000 readings/second using digitizer function (16 bit resolution)
    
  • Measurement are always stored in a internal buffer, this can be presented in various ways, saved to a usb key or downloaded.
    
  • The fan is fairly quite.
    
  • Weight is 4580g including bumpers.
    
  • Size is 390 x 225 × 100mm including bumpers.
    
  
  
• Probes
  
  
  
  • Probe resistance 33mOhm for one.
    
  • Probe wire is very soft and 116cm long.
    
  
  

• Scanner card. A 10 channel scanner or 5 channel with 4 terminal connections or a 9 channel thermocoupler card with build in compensation.
  
• Communication interfaces. USB and LAN is included, all other is extra, there are 3 different cards (Only one can be used at a time).
  
• TSP link that is an interface to other Keithley equipment, this also requires a communication interface.
  
• PC software.
  

DMM HoldPeak HP-770D



This is a DMM with 40000 count display and lot of functions.







It arrived in a universal HoldPeak cardboard box.




Inside the box was a pouch with everything inside.



It included the DMM, a pair of probes, a thermocoupler, a instructions sheet and the pouch.




No tip covers on these probes that is rated for 1000V Cat III and 20A
This means the rating is wrong.



The plug is fully shrouded.




The thermocoupler is encapsulated, this makes it usefull for inserting in stuff, but not as good for measuring surface temperatures.








Using the tilting bale I was a bit worried about it breaking, after some time it got a bit more loose.









There is a small light in the range switch.





The sleeve do not give much protection agains bumps.






Display



The above picture shows all the segments on the display.



Display during normal usage, it will show selected range and value.



Voltage detector shows dashes depending on the strength of the electric field. It will also beep and turn on a red led while there is a field present.



At the top is two leds used for the NCV, green when no field detected and red when a field is detected. The center position is a photosensor used to turn on the backligh on the display and the light in the range switch.


Functions



Buttons:

• Select: Select between AC/DC and different function for ohm settings.
  
• Range: Will disable auto range and change range, hold down to activate auto range.
  
• Rel: Shows values relative to current value, will also select manual range. Press again to disable.
  
• Hz duty: Shows frequency and duty cycle in AC and frequency ranges.
  
• Hold: Freezes the display.
  
• Max/Min: Captures maximum/minimum values, will show min/max, requires repeating pulses to capacture the full value.
  

• Off: Meter is turned off
  
• A: Current AC and DC. In AC the Hz button will show frequency and duty cycle.
  
• mA: Current AC and DC. In AC the Hz button will show frequency and duty cycle.
  
• uA: Current AC and DC. In AC the Hz button will show frequency and duty cycle.
  
• hFe: Transistor tester.
  
• °C/°F: Temperature, will show internal temperature when no probe is connected.
  
• NCV: Non contact voltage or electric field detection.
  
• Hz: Frequency, use Hz button to select duty cycle.
  
• : capacitance.
  
• : Resistance, diode and continuity.
  
• mV: Show DC or AC mV. In AC the Hz button will show duty cycle.
  
• V: Show DC or AC Volt. In AC the Hz button will show duty cycle.
  
• Off: Meter is turned off
  

• 20A: High current, maximum is 20A for 10 seconds.
  
• mAuA: The lower current ranges and temperature.
  
• COM: The common terminal for all ranges.
  
• xxx: All other ranges.
  

• Volt and frequency
  
  
  
  • Frequency counter (Range Hz) will count as long as the voltage goes within 1V of COM positive or negative.
    
  • At 1Vrms frequency input range is 0.9Hz to 19MHz
    
  • Frequency is always auto range
    
  • Frequency counter and duty cycle can only be selected in AC ranges.
    
  • Duty cycle works from 30% to 70% at 100kHz with 2Vpp, precision is within 1.6
    
  • Duty cycle works from 1% to 99% at 100kHz with 4Vpp, precision is within 0.1
    
  • 1 VAC is 5% down at 5.0kHz (RMS will not work at the frequency).
    
  • Min/max is about 360ms to capture a value (It require that the peak repeats).
    
  • Input impedance is 10-11Mohm on DC and AC including mV
    
  • mV DC/AC input impedance drops to 2kohm above 2V
    
  • Frequency input is 3-6Mohm below 2V above it drops to 2kohm.
    
  • Rated overload protection is 100VDC and 750VAC
    
  
  
• Current
  
  
  
  • Frequency counter and duty cycle can only be selected in AC ranges.
    
  • Fuse on uA/mA is 500mA/500V 6.3×32mm
    
  • Fuse on A is 20A/500V 6.3×32mm
    
  • mA range has audible alert when current is too high
    
  • 20A for up to 10 seconds.
    
  
  
• Ohm, Continuity, diode and capacitance
  
  
  
  • Ohm needs about 3s to measure 100ohm
    
  • Ohm is 1.0V open and 0.39mA shorted
    
  • Continuity is moderate (About 110ms).
    
  • Continuity beeps when resistance is below 62ohm.
    
  • Continuity is 1.0V open and 0.39mA shorted
    
  • Diode range uses 2.7V, max. display is 1.9999V at 0.4mA, max. current is 1.5mA shorted
    
  • 11000uF takes about 9 seconds to measure (A too low value is shown af 5 seconds).
    
  • Rated overload protection on is 500V DC/AC
    
  
  
• Miscellaneous
  
  
  
  • Current consumption of meter is 1.4mA in DC and 5.3mA in AC ranges(9.5mA with backlight in AC)
    
  • Meter works down to 2.4V where it will turn off, battery symbol show at 8.0V.
    
  • Reading are stable down to 3.5 volt, below that it will increase the reading significantly (40% above at 2.5V)
    
  • Backlight brightness starts to drop at 4.5V and is dim at 3.2V
    
  • Backlight has a significat hotspot where the led is placed.
    
  • Viewing angle is good.
    
  • Display updates around 5 times/sec
    
  • Bargraph works at same speed as the numeric readings.
    
  • The meter usual need a couple or more display update to reach the final value.
    
  • Backlight is controlled by ambient ligthning, i.e. it turns automatic on.
    
  • Will automatic turn power off in about 15 minutes (Holding SELECT down during power on to disable).
    
  • Standard probes can be fully inserted.
    
  • Weight is 355g without accessories, but with rubber sleve and batteries.
    
  • Size is 194 × 88 × 44mm with rubber sleve and battery.
    
  
  
• Probes
  
  
  
  • Probe resistanse 42mOhm for one.
    
  • Probe wire is soft and 100cm long.
    
  
  

DMM Siglent SDM3045X



This is a low end bench meter, but it has many of the function of a high bench end meter, but not the resolution.



It arrives in a big very solid cardboard box with the DMM well protected inside.



It includes the meter, a quick start guide, a calibration certificate stating that the meter is in calibration, mains cable, a pair of probes with alligator clips and a usb cable. It do not include any manuals, they must be downloaded.





Standard probe, with good safety.



The plug is fully shrouded.





Isolated alligator clips to mount on the probes.



The front has the display, the buttons and the input.




There are vent holes on the sides, but the meter do not have a fan.



The meter can be tilted in two different positions.



With the handle at the front the meter is ready to be carried.




The back, there was a warning to check the mains voltage.



The input fuse is on the back of the meter.



Display



This meter is a computer that needs some time to boot and do self test, during that time it shows the brand name. Total time is about 16 seconds.



Typical display when measuring without any of the more advanced stuff activated. Here I am measuring a voltage.



Secondary display enabled and showing frequency. Many function on the secondary display will mean a relay has to change mode of the meter. Any combination of VDC/VAC/IDC/IAC can be shown on the main/secondary display, the ACV can also be combined with frequency or period.



A bargraph can be enabled, it is possible to configure endpoints.



The statistic can show max/min/average and a bit more.



It is possible to show data as a chart.



Or as a histogram with up to 400 bins.



The collected data can be saved to usb, but it requires a number of button presses:
Utility, Store/Recall, Store settings, Browse, arrow down, Select, Type, Store Data, Yes, Done.



There is also a help system build into the meter.



Functions

• DCV/DCI: DC voltage and current.
  
• ACV/ACI: AC voltage and current
  
• ohm 2W/4W: Resistance in either two or four wire mode.
  
• /Freq: Capacitance and frequency
  
• Cont/: Continuity and diode.
  
• Temp/Scanner: Temperature with either a thermocoupler or PT100 sensor.
  
• Dual/Utility: Select dual display measurement and save/configure/test/update.
  
• Acquire/Help: Set trigger and look in build-in manual.
  
• Math/Display: Statistic, Limits, DB, relative, bargraph, chart, histogram selections.
  
• Run/Stop: Select to measure or not.
  
• Single/Hold: Trig a single measurement and enable auto-hold mode.
  
• Shift/Local: Access all the blue functions and cancel a remote connection (Local only need a single press on the key).
  
• : Selection and adjustment in various menus.
  
• OK: Confirmation of selection in menus.
  
• /Range/: Change between auto range and manual range and select range.
  

• HI: The voltage, frequency, capacitance, diode and ohm positive input.
  
• LO: The voltage, frequency, capacitance, diode and ohm negative input.
  
• HIsense: Four terminal ohm.
  
• LOsense: Four terminal ohm.
  
• 10A: Current input
  

• Volt and frequency
  
  
  
  • At 100mVrms frequency input range is from 2Hz to 500kHz
    
  • Frequency counter has a capacitor at the input and ignores any DC offset.
    
  • 1 VAC is 5% down at 320kHz, rms will not work at this frequency
    
  • Period is 1/frequency, it do not show high/low period time.
    
  • Min/max captures in about 200ms on slow speed and 15ms in fast speed, but peak must match sample window.
    
  • Min/max is based on normal measurements, there is no special mode/circuit to make faster captures, this is standard for bench meters.
    
  • Meter can show dB with adjustable reference either measured or entered.
    
  • dBm reference impedance has these settings: 50, 75, 93, 110, 124, 125, 135, 150, 250, 300, 500, 600, 800, 900, 1000, 1200, 8000,
    
  • Input impedance is 10Mohm on DC, but only 1Mohm on AC with capacitor coupling.
    
  • Frequency input is similar to AC input.
    
  • mVDC range can be set to high impedance.
    
  • The VDC range will toggle a relay, even when not changing range. This may reduce reading speed significantly!
    
  
  
• Current
  
  
  
  • Current range is protected with a 10A/250V 5×20mm glass fuse accessible from outside.
    
  • There is also a internal 12A/250V 5×20mm ceramic fuse for protection.
    
  • uA range has very low burden voltage, it do not use the common 100ohm shunt.
    
  • Auto range will disconnect shortly when changing from 6mA to 60mA range and 600mA to 6A range.
    
  • Even in manual range the meter will auto range when a current range is overloaded.
    
  
  
• Ohm, Continuity, diode and capacitance
  
  
  
  • Ohm needs about 2s to measure 100ohm in default slow and about 0.3s on fast.
    
  • Ohm is up to 5.0V open and 1.0mA shorted
    
  • Continuity is quick (About 30ms).
    
  • Continuity beeps when resistance is below 50ohm, this is adjustable.
    
  • Continuity is 5.0V open and 1.0mA shorted
    
  • Diode range uses 5.0V, max. display is 4.000V at 1.0mA, max. current is 1.0mA shorted (Max. display is adjustable from 0 to 4V).
    
  • Diode range maximum is adjustable, it follows selected threshold, i.e. with 2V as threshold meter will maximum show 2V (Silly).
    
  • 10uF takes about 2.5 seconds to measure.
    
  • 9700uF takes about 14 seconds to measure.
    
  
  
• Miscellaneous
  
  
  
  • Power consumption when on is 9 watt
    
  • Power consumption when off is 3 watt
    
  • The meter reach final value in a few updates, extra updates is required when doing auto range.
    
  • Viewing angle is good.
    
  • Display update speed depends on settings (5, 50, 150 / second)
    
  • Bargraph updates will follow the display update, this is normal for bench meters.
    
  • At 150 readings/second the resolution will be reduced to 3.5 digit.
    
  • The last 10000 measurement are stored in a internal buffer, this can be presented in various ways, saved to a usb key or downloaded.
    
  • Weight is 3820g including bumpers.
    
  • Size is 300 x 260 × 110mm including bumpers and handle.
    
  
  
• Probes
  
  
  
  • Probe resistance 26mOhm for one.
    
  • Probe wire is very soft and 98cm long.
    
  
  

Power supply frontend DPH5005-USB 50V/5A with Bluetooth and USB interface



This device is the front end for a power supply, it must be supplied with low voltage DC power (Up to 50V).
Official specifications:

• Input voltage range: 6.00-50.00V
  
• Output voltage range: 0V-50.00V
  
• Output current: 0-5.00A
  
• Output power range: 0-250W
  
• Product Weight: about 222g
  
• Display module size: 79*43*38(mm) (L*W*H)
  
• Cutout size: 71mm*39mm
  
• Power module size: 93*71*41(mm) (L*W*H)
  
• Length of connecting line: 200mm
  
• Fixed hole center distance: 86mm, 64mm
  
• Output voltage resolution: 0.01V
  
• Output current resolution: 0.001A
  
• Output Voltage accuracy: ± (0.5% + 2 digit)
  
• Output Current accuracy: ± (0.5% + 3 digits)
  
• Max allowable input current: 10A
  
• Output ripple: 100mVpp
  

• Application will show an ad for another RD product when started.
  
• Application is not on Google.
  
• RD uses a file download service that opens ads in minimized windows.
  
• Protocol is documented.
  

• Application is a 230MB download
  
• Inside the archive is installation files
  
• Application is very slow to install if it has to install the National Instruments part.
  
• The screen is a fixed size (1062 × 619 pixels), there is no resize options.
  
• RD uses a file download service that opens ads in minimized windows.
  
• Protocol is documented.
  

DMM WinApex ET8102



This is a fairly cheap true rms multimeter.




I got it in a typical cheap multimeter box, the drawing mostly match the meter.



That was the meter, the probes, a thermocoupler and a manual.





Probes are marked CAT III, but do not have the (partial) tip covers, this means they are CAT II.



The plugs are fully shrouded, but the shroud is a bit short




The thermocoupler is the standard cheap type with banana plugs, the cable is rather thin.



The meter is not very heavy making it difficult to turn the range switch or press buttons without the meter moving around when on tilted.





















Display



All the segments are shown during power on, but not all are used.



Typical display during usage, it will show the number and selected measurement



The NCV indicator, in addition to the bars the beeper will sound.



Functions



Buttons:

• Select (Yellow): Select DC/AC in current modes, continuity, diode, capacity, temperature in ohm mode and can also be used to show duty cycle in Hz mode and frequency and duty cycle in AC mode.
  
• Hold: Will freeze the display reading, until pressed again, hold down to activate the background light.
  
• Range, REL: Select manual range and change range, hold down to reactivate automatic ranging. In capacitance it is a REL function to zero out and offset.
  
• Max/min: Capture maximum and minimum values, it will change between max/min/actual, holding it down will activate flashlight.
  

• Off: Meter is turned off
  
• VAC: AC voltage and frequency/duty-cycle, the frequency input has high sensitivity and low bandwidth.
  
• VDC: DC voltage
  
• : Ohm, diode, continuity, capacitance, temperature Fahrenheit, temperature Celsius
  
• Hz: Logical frequency input, can also show duty cycle.
  
• A: Ampere DC or AC
  
• mA: Milli ampere DC or AC
  
• uA: Micro ampere DC or AC
  
• Test: Phase detection with one connection. This will show 0 or OL in the display, OL means phase detected.
  
• NCV: Non-contact voltage or electric field detection.
  

• 10ADC: 10A DC current input.
  
• COM: The common terminal for all ranges.
  
• xxx: All other ranges, including uA and mA.
  

• Volt and frequency
  
  
  
  • 1V AC readings is 5% down at 2.3kHz, rms will not work at that frequency
    
  • AC frequency range with 0.1V input is from 1.1Hz to 2.5kHz
    
  • AC frequency range with 0.1V input it can be stretched to 32kHz
    
  • AC frequency range requires a zero crossing.
    
  • Frequency input can handle +/-2.8V offset with 1Vrms input.
    
  • At 1Vrms frequency input range is from 1.1Hz to 44MHz
    
  • Duty cycle works from 1% to 99% at 100kHz with 4Vpp, precision is within 0.3.
    
  • Max/min needs about 200ms to capture a voltage, autorange is disabled when using this function and it will not capture every max/min.
    
  • Input impedance is 10-11Mohm on DC and AC
    
  • Frequency input is 2-3kOhm in input impedance above 2V
    
  • Input protection is 1000VDC/750VAC
    
  • Frequency input is protected to 250V or 550V DC or AC peak (Both values are specified).
    
  
  
• Current
  
  
  
  • 10A range has audible alarm above 10A
    
  • 10A range is fused with a 10A/250V 5×20mm fuse
    
  • mAuA range is fused with a 0.6A/250V 5×20mm fuse
    
  • Current ranges starts in DC
    
  • Input voltage must not be more than 36VDC or 25VAC
    
  
  
• Ohm, continuity, diode and capacitance
  
  
  
  • Ohm needs about 2.5s to measure 100ohm
    
  • Ohm voltage is 1.1V open and 0.25mA shorted.
    
  • Continuity is fast (About 20ms).
    
  • Continuity beeps when resistance is below 50ohm.
    
  • Continuity is 2.1V open and 0.25mA shorted
    
  • Diode range uses 4.0V, max. display is 3.3V at 0.25mA, max. current is 1.5mA shorted
    
  • 10uF takes about 2.5 seconds to measure.
    
  • 70000uF takes about 7 seconds to measure.
    
  • Overload protection is 550V DC or AC peak
    
  
  
• Miscellaneous
  
  
  
  • Current consumption of meter is 1.6mA, 8.2mA with backlight, 9.1mA with backlight and 13.3mA with both.
    
  • Meter turns off at 2.2V, battery symbol show at 2.3V.
    
  • Readings will be correct until meter turns off.
    
  • Backlight fades with dropping voltage, but it usable until meter turns off.
    
  • Flashlight fades with dropping voltage, but it usable until meter turns off.
    
  • Viewing angle is good except from the top.
    
  • Display updates around 3 times/sec
    
  • Backlight will automatic turn off after about 12 seconds.
    
  • Flashlight will not automatic turn off, but turns off when the meter turns off.
    
  • Will automatic turn power off in about 17 minutes.
    
  • Standard probes cannot be fully seated in the meter, but they do connect (About 5mm stick up).
    
  • The meter usual need a few display update to before it display the value.
    
  • Weight is 209g without accessories, but with sleeve and battery.
    
  • Size is 145 × 70 × 37mm with sleeve
    
  
  
• Probes
  
  
  
  • Probe resistance 46mOhm for one.
    
  • Probe wire is soft and 73cm long.
    
  
  

Olight i3E Eos with eneloop battery.

Victorinox Mini Champ.

Nite Ize Doohickey. 

I have not found any triple A flashlight smaller than the Olight. Mini champ's bottle opener I can not master hence the doohickey. Unless I have a specific need for a larger flashlight or multi-tool this is my EDC. Anyone know of a smaller triple A?

DMM Mustool MT109



This is a smaller meter that has a lot of ranges.





I got the meter in a brown cardboard box, the drawing mostly matches the meter.



It included the DMM, a pair of probes, a thermocoupler and a manual.





The probes has is rated for CAT III, but do not include the partial tip covers required for CAT III or CAT IV.



The shrouded plug is the slightly short variety.




A standard cheap thermocoupler.



The range switch is a bit difficult to use single handed when meter is on the tilting bale, it slides around.






There is a flashlight led on the front of the meter.


















Display



The above picture shows all the segments on the display, not all are used.



Typical display during usage, it will show the number and what measurement is selected.



The NCV is the usual bars and the buzzer.



Functions



Buttons:

• Select (White): Select the ranges printed with yellow.
  
• Hold: Freezes the display, hold down to turn off backlight (Display is not readable with backlight off).
  
• Range/Rel: Will disable auto range and change range, hold down to activate auto range. In capacity mode it will zero the reading.
  
• Max/min: Starts recording maximum and minimum value, press to select between max/min/disable. Hold down to turn the flashlight on/off.
  

• Off: Meter is turned off
  
• VAC: Show AC voltage, using the Select button to select frequency and duty cycle.
  
• VDC: Show DC voltage.
  
• mV: Show mV, use Select to change between DC and AC
  
• : Resistance, diode, continuity, diode, capacitance.
  
• Hz: Logical frequency and duty cycle (Use Select to change between them).
  
• A: Current DC and AC (Use Select to change between DC, AC, Frequency, Duty-cycle).
  
• mA: Current DC and AC (Use Select to change between DC, AC, Frequency, Duty-cycle).
  
• TEMP: Temperature, used Select to change between Celsius and Fahrenheit.
  
• NCV: Non-contact voltage or electric field detection.
  

• 10A: High current input
  
• COM: The common terminal for all ranges.
  
• xxx: All other ranges.