DMM Handskit 117C

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I bought this meter as "HY-19" without any brand on Aliexpress, but when I received it the name had changed to the above.

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This meter did not come in a cardboard box, but in a plastic box with lot of accessories included.

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There was the meter, instruction sheet and probes, but in addition there was extra sharp and thin probe tips, alligator clips, hooks and a SMD tweezers.

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The probes are rated for 1000V and 20A in CAT II environment.

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They include a tip protection.

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The plug is fully shrouded with the short type of shroud (17mm).

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This probe can be used when measuring on small stuff or be stuffed into some connectors to measure while it is connected.

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The tilting bale is just about stable enough to change range and use switches with one hand.

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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 meter.

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Typical display during usage, it will show the number and what measurement is selected.
AUTO is for auto range and APO is for automatic power off.

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The electric field detection (NCV) shows from 1 to 4 bar depending on field strength. It is very sensitive.



Functions

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This meter will remember what was selected with SELECT and start in the same function next time, power off will not reset this.

Buttons: Rotary switch:
Input

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Measurements
1uF

A look at the capacity measurement waveform.

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Frequency input resistance.

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The low capacity range has bad tolerances, but that range is not covered in the specifications. The highest ohm range is about 2% out around 50Mohm, but within tolerances at lower values.



Tear down

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I had to remove 4 screws to open it.

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The meter uses ceramic fuses and fairly large ones.

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The large fuse is rated for 100kA, this is probably a bit optimistic. The small fuse is without any printing on it.

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I needed to remove 6 more screws to get the circuit board out.

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On this side there is no components, but only areas for the different switches and a NCV antenna at the top.
The lcd required two screws more and unsoldering the backlight. It did not look like there was anything under it, so I let it stay on this time.

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The inside looks fairly standard for a cheap multimeter. Besides the large fuse is the mA (R52 0.99ohm) and uA (R37: 99ohm) shunts, they are protected by a couple of diodes (D8..D12). Above the small fuse is the input divider (R44..R47: 4x2.5Mohm). Output protection for ohms is PTC1 and two transistors (Q3 & Q4), this protection circuit is also used for mV and Hz input.
The 9V battery goes to a voltage regulator (IC6) and is then used to supply the multimeter IC and the EEPROM (24C08N).
This side do also have a NCV antenna at the top of the circuit board.

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Conclusion

As usual the CAT rating is fairly optimistic with fuse specifications saying 250V.
This meter has all the usual ranges, except temperature, the only "extra" function is NCV. With all the included accessories this is a nice meter kit for low voltage and mains in the home.



Notes

This meter is a rebrand from HY-19 (That is probably also a rebrand).

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