DMM WinApex ET8102
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This is a fairly cheap true rms multimeter.
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I got it in a typical cheap multimeter box, the drawing mostly match the meter.
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That was the meter, the probes, a thermocoupler and a manual.
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Probes are marked CAT III, but do not have the (partial) tip covers, this means they are CAT II.
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The plugs are fully shrouded, but the shroud is a bit short
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The thermocoupler is the standard cheap type with banana plugs, the cable is rather thin.
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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.
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Display
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All the segments are shown during power on, but not all are used.
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Typical display during usage, it will show the number and selected measurement
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The NCV indicator, in addition to the bars the beeper will sound.
Functions
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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.
Rotary switch:
- Off: Meter is turned off
- VAC: AC voltage and frequency/duty-cycle, the frequency input has high sensitivity and low bandwidth.
- VDC: DC voltage
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: 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.
Input
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- 10ADC: 10A DC current input.
- COM: The common terminal for all ranges.
- xxx: All other ranges, including uA and mA.
Measurements
- 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).
- 1V AC readings is 5% down at 2.3kHz, rms will not work at that frequency
- 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
- 10A range has audible alarm above 10A
- 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
- Ohm needs about 2.5s to measure 100ohm
- 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
- Current consumption of meter is 1.6mA, 8.2mA with backlight, 9.1mA with backlight and 13.3mA with both.
- Probes
- Probe resistance 46mOhm for one.
- Probe wire is soft and 73cm long.
- Probe resistance 46mOhm for one.
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A look at the capacitance measuring waveform with a 1uF capacitor.
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The logical frequency input is about 2-3kOhm in input impedance.
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High DC voltage will block for AC readings.
Tear down
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I had to remove the sleeve and four screws to open the meter.
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The circuit board is not shaped like the enclosure, but is just a rectangle. The NCV bulb is empty, the antenna is only the circuit board.
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There was 6 screws holding the circuit board in.
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There is only a limited amount of parts on this side: The two fuses, a PTC for protection, the buzzer, crystal, capacitor and the flashlight led.
The two points marked SW1 & CAL is accessible from the battery compartment without opening the meter.
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The meter is on this side. The current input has a wire shunt for the 10A range and next to it the 1ohm and 99ohm for the mA and uA ranges, they are protected with a TVS diode (D3). The voltage input has the usual 10Mohm input made from two 5Mohm resistors.
The ohm range uses the PTC and a transistor pair (Q1 & Q2) for protection, but do also have a sense path through a small SMD resistor (R7: 1Mohm).
The NCV antenna is at the top of the circuit board and has a high ohmic resistor (R40: 22Mohm).
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Conclusion
As usual I do not believe the CAT rating, 250V fuses and a small SMD resistor on ohm input is not enough.
The meter looks very cost optimized, but it has a lot of functions, only mV is missing. The ohm position is rather busy with 6 selections.
Notes
This meter exist with many different names on it and small variations in functions.
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