DMM Aneng AN101

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This is a fairly cheap pocket DMM with most functions.

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The DMM comes with its own box.

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The probes are rather small, here it is besides a normal sized probe.
They are marked 400V 200mA, CATII, i.e. lower CAT rating than the meter.

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The plugs are not shrouded and considerable smaller than standard probes.

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The box has a few tricks, it can be used as a stand or it can protect the meter from splashes

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The meter uses a CR2032 battery.

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Display

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All segments on the display.

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



Functions

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Buttons: Rotary switch:

Input

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This meter has shared voltage and current input and without a fuse this is usual a bad idea. The meter has a PTC to protect the current ranges.


Measurements
DMMschema

I could not find any specifications for ohms.
AC volt shows 4.78V with 5V input at 50Hz (DC is fine).
AC volt shows 198V with 227V input at 50Hz (DC is fine).
DC current is about 4 count outside the tolerance.



Tear down

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Two screws and the back could be removed.

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A few more screws and the circuit board could be removed.

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On this side there is only the switches and connections to the display.

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The yellow part is a PTC to protect the current ranges, the green part is probably a PTC to protect the ohms range. The resistors below the green part is the current sense resistors (100ohm & 1ohm).
The MELF (Round resistor) resistors near the trimpot is a 10Mohm input resistor, the other MELF resistors is used for the different ranges.
Below the buzzer is a hidden number printed on the circuit board XT9210 and a data 20170222 .

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Conclusion

This is a very compact multimeter with many of the common DMM functions, but it is missing ampere, frequency, capacity and temperature. The precision is not as good as promised and my meter has a problem with measuring 230VAC. The safety with the probes is also questionable.
The PTC protection on the current range is a very big advantage, no blown fuse or meter due to small mistakes.

I would not recommend this meter for mains measurement or precision measurements, but for checking something on the bench or in a car it is acceptable.



Notes

This meter probably exist with many different names on it and small variations in functions.

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