DMM Aneng B01

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This is a pen type multimeter, i.e. one probe is part of the multimeter.

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I got it in a cardboard box without any interesting information on the outside.

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The box contained the meter bag with everything inside the bag.

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It included the DMM, a black probe, a black alligator clip wire, an instruction sheet and a bag.

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The probes has removable tip cover, but with or without the cover it is only rated for CAT II either 1000V or 600V.

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The plug is fully shrouded, but shorter than standard probes.

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The wire with alligator clip uses a standard banana plug.

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The front of the meter is the red probe, there is also a flashlight. On the back of the meter is the socket for the black probe.

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Here the flashlight is on.

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The tip cover can be removed, rating is the same as for the loose probe.

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Display

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

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Typical display during usage, it will show the number and what measurement is selected. When selecting range It requires checking the top and bottom of the display to see what is selected.



Functions

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Buttons:


Input

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One probe is part of the multimeter, the other is connected at the back.



Measurements 1uF

A look at the capacity measurement waveform.

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Frequency input resistance.

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Tear down

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Four screws and the back could be removed.

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The back has holes for the sound from the buzzer, but the holes end below the battery cover? (The buzzer is load enough).

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The circuit board is mounted with clips, the 3 screws are for the display. I wonder how long the yellow (white here) switch is going to last. A hard press on it may pop the soldering and nothing else is holding it.

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Display and circuit board removed.

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The yellow button has a real switch behind it.

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The input resistors (R22, R29: 2x5Mohm) are permanently attached to the input terminal. The input terminal is also connected to the switch and can be routed to a PTC (PTC1: 1.5kOhm) and a transistor clamp (Q4, Q5). Interesting enough a wire also goes from the input side of the PTC further up the circuit board. I traced it to another input resistor (R21: 900kOhm). This do not look like a area or resistor that can handle high voltage!
Near the multimeter chips is a EEPROM (U1: P24C02A) for calibration and functions.

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There is no risk of the led getting close to the input, there is a wall between.

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Conclusion

As usual I doubt the CAT rating, the meter must handle 600V in all ranges, but the manual says not to put voltage into the ohms ranges.
The meter works fine and has many functions including a flashlight and NCV, but finding the correct measurement can be a bit frustrating with all the pushes on the yellow and red buttons. There is also a complete lack of any current measurements.
I like the large digits on the display, but the units showing what is selected, is a bit small.


Notes

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

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