DMM Handskit 117C



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



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



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.




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



They include a tip protection.



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



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










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














Display



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



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.



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



Functions



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

Buttons:

• Hold: Will freeze the display, hold down to turn backlight on.
• Range: Switch to manual ranging and will also change range, hold down to get back to automatic.
• Rel: Remember the current reading and shows all further values relative to this, will disable auto ranging.
• Hz %: Select Hz and duty cycle display in AC ranges, is also used in Hz range to select duty cycle.
• Select (Orange): Selects orange marked ranges for each position on the range switch.
• Max/min: Starts capturing maximum and minimum values, pressing it will change between max/min on the display, holding it down will return to normal. This function will disable auto ranging.

Rotary switch:

• Off: Meter is turned off
• VAC: Show AC voltage, use Hz to display frequency.
• VDC: Show DC voltages.
• mV: Show millivolt, use SELECT to change between DC and AC. In AC Hz can be used to show frequency.
• : Resistance, continuity, diode and capacitance, use SELECT to change between them.
• Hz: Frequency and duty cycle, this only works in AC ranges and on the Hz setting.
• A: Current DC and AC, use SELECT for AC and "Hz" for frequency and duty cycle.
• mA: Current DC and AC, use SELECT for AC and "Hz" for frequency and duty cycle.
• uA: Current DC and AC, use SELECT for AC and "Hz" for frequency and duty cycle.
• NCV: Non contact voltage or electric field detection.

Input

• 10A: High current, it can only withstand 10+ ampere for a short time (Fuse is 10A).
• mAuA: The lower current ranges, the selector switch will change between two different shunts.
• COM: The common terminal for all ranges.
• xxx: All other ranges.

Measurements

• Volt and frequency
  • Frequency input requires a zero crossing.
  • Max/min needs about 390ms to capture a voltage.
  • At 0.1Vrms input frequency range is from 0.8Hz to 4.5MHz
  • At 1Vrms input frequency range is from 0.9Hz to 7.8MHz (At 3.5V rms I reached 70MHz).
  • Duty cycle works from 2% to above 94% at 100kHz with 1Vpp, precision is within 0.3
  • 1 VAC is 5% down at 2kHz
  • Input impedance is 10-11Mohm on DC and AC.
  • Millivolt range has high input impedance in DC up to 2V, then it drops to 2Kohm, AC mV is 10Mohm, but drops to 2kohm
  • Frequency input is 1-3Mohm up to 2V, then it drops to 2kOhm
  • Voltage ranges rated to 1000VDC or 750VAC
  • mV range rated to 550V
  • NCV is very sensitive.
• Current
  • mAuA is protected with 0.6A/250V 6.3x32mm fuse (More correctly 5.9x30mm it is not sand filled, i.e. not a HRC fuse)
  • A is protected with 10A/250V 10x38mm fuse
  • There is audible alarm when current goes about 6.2mA in uA range.
  • There is no audible alarm in mA range.
  • There is audible alarm when current goes above 10A in 10A range.
• Ohm, Continuity, diode and capacitance
  • Ohm needs about 2.5s to measure 100ohm.
  • Ohm is 0.97V open and 0.39mA shorted
  • Continuity is very fast (Below 10ms).
  • Continuity beeps when resistance is below 50ohm
  • Continuity is 1.01V open and 0.39mA shorted
  • Diode range uses 3.2V, max. display is 3.000V at 0.16mA, max. current is 1.7mA shorted
  • 70000uF takes about 8 seconds to measure.
  • Ranges rated to 550V ACpeak/DC for 10 seconds.
• Miscellaneous
  • Current consumption of meter is about 2mA, except ohm where it is 4.3mA (12mA with backlight in volt)
  • Meter works down to 1.8V where meter turns off, battery symbol show at 5.8V.
  • Backlight fades with falling voltage it is about gone at 2.6V
  • Reading is stable until about 2.0V where it increase a few count.
  • The meter needs a couple of display update to reach the final value.
  • Viewing angle is good
  • Display updates around 3 times/sec
  • Backlight will automatic turn off in about 15 seconds.
  • Will automatic turn power off in about 15 minutes.
  • Standard probes cannot be fully inserted.
  • Weight is 366g without accessories, but with batteries and sleeve.
  • Size is 183 x 90 x 46mm with sleeve.
• Probes
  • Probe resistance 36mOhm for one
  • Probe wire is soft and 88cm long.
  • Gripper wire resistance is 10mOhm
  • Griper wire is 57cm long.
  • SMD tweezers wire is 51cm long.

A look at the capacitance measurement waveform.



Frequency input resistance.



The low capacitance 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



I had to remove 4 screws to open it.





The meter uses ceramic fuses and fairly large ones.



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



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







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.






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.










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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