DMM Aneng H01

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This is a fairly cheap Aneng multimeter, but is has most of the common ranges.

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I got the meter without a box

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It included the meter, probes and a instruction sheet that do not match the meter.

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Probes are not branded and are specified for CAT III, this cannot be true with that much tip exposed.

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The plug is fully shrouded but very short with 13.7mm shroud.

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Pressing on the meter the rotary switch can be turned when the meter is on its tilt stand.

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Display

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The above picture shows all the segments on the display, a few of them are not used.

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Usually the meter shows the selected range and the value.

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The Non contact voltage detector is the usual bars.



Functions

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Buttons:

Rotary switch: The color scheme around the rotary switch looks like it was added for design, not to help with identifying similar ranges and the yellow button also affect a blue range (uA).


Input

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Measurements 1uF

A look at the capacitance measurement waveform when measuring 1uF

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Frequency input resistance, the impedance is a bit above 1Mohm up to around 2V where it drops to 2kOhm

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The input resistance in off is rather low.

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Meter is true-rms
Large DC values will block for AC readings.
The supplied manual do not match the meter, i.e. the tolerance specifications and overload ratings are probably wrong.
The mA fuse is only 0.25A





Tear down

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I had to remove four screws to open the meter.

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The NCV antenna is a wire going into a cut slit in the enclosure and the wire is damaged from that.

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A closeup of the NCV antenna.

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Four more screws and I could remove the circuit board.

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The 10A current shunt is a but thin, but works fine. The uA (1000: 100ohm) and mA (1R00: 1ohm) resistors next to it together with the protection diodes (2xM7), a fast check shows they will drain about 15uA at 0.4V at about 25C, this is the 4000uA range (this is 0.4% error and tolerances says 1%).
The voltage input has the usual resistor (10Mohm) next to the fuse. For ohm/diode/continuity/capacity the PTC and a transistor pair (Marked Y1) protected the current output, the input uses a 1Mohm resistor (Under the PTC) directly connected to the chip. In Hz the PTC and same transistor pair is used.
This meter do not have the classical set of resistor (1k-10k-100k-1M) for the ranges, maybe they are inside the chip.
A little test: 4000uA current, display shows 4015uA, hit the diodes with a heat gun at 100C for a short time, display shows 3900uA.

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Conclusion

The CAT rating is not correct, unfused cannot be CAT rated.
The meter is very cost optimized with nearly everything in a single chip, but I do not like that the meter uses a SMD fuse on mA and it may easily blow if using the full mA range. The partly cut through NCV antenna is also bad.
The meter has a good selection of ranges, but there are a couple of omissions and not that many functions



Notes

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