Test/review of Internal Resistance Tester YR1035

1 post / 0 new
HKJ
HKJ's picture
Offline
Last seen: 31 min 46 sec ago
Joined: 05/24/2011 - 12:23
Posts: 6058
Location: Copenhagen, Denmark
Test/review of Internal Resistance Tester YR1035

Internal Resistance Tester YR1035


DSC_7156

This is a meter designed to measure internal resistance in batteries.

DSC_7146

I got the meter in a random shipping cardboard box, it contained:
The meter, 4 terminal probes with extra pogo pins, 4 terminal clamps, 4 terminal battery holder and a manual in Chinese (It is possible to order with the accessories that you want).

DSC_7155

The meter has a recharge battery inside and is charged from a micro usb connector.

DSC_7160

It uses a round metal connector for the four terminal connection. The connector is locking, i.e. the plug cannot fall out. Pulling the ring on the plug will unlock it can be pulled out.

DSC_7161

DSC_7162DSC_7163

DSC_7410

The meter has Chinese text in the display and it is not possible to select English.

DSC_7409

For just using it as a milli-Ohm meter it is not really an issue.

DSC_7398

When not used for some time, it will go into standby mode, this requires a button pres to leave.

DSC_7414


There is a couple of buttons:
Power is used to turn on/off the device.
Hold/Zero is used to freeze the ohm reading, I did not have much luck with the zero function.
Range R is used for manual range select on ohms (20m, 200m, 2, 20, 200, auto).
Range U is used for manual range select for volts (1V, 10V, 100V, auto).

DSC_7148

Four terminal probes made with pogo pings in aluminium tubes and some shrink wrap.
The wires are soft silicone.

DSC_7150

A closer look at the business end.

DSC_7147

If a pogo pin is damaged, it can be pulled out and a new one pushed in, the pack included four spares.

DSC_7149

The plug looks like a fairly good quality.

DSC_7151

The clamps are a cheap Chinese four terminal model.

DSC_7152

The battery holder is a fairly standard four terminal holder (I use same type for my battery test). It is not the fastest way to connect a battery, but gives stable connections.





Measurements


  • The ohm meter is 2200 count display
  • The voltmeter is a 100000 count display.
  • The AC used to measure ohms are 1kHz at up to about 100mV rms, it will vary with range and measured resistance.
  • Output voltage when open is about 2.5Vrms.
  • Power consumption while off: 5.1uA
  • Power consumption while on with light: 65mA
  • Power consumption while on with light and shorted probes: 140mA
  • Power consumption in standby mode: 15mA


ohm

Due to the way the meter works it do not need a battery to measure resistance, but can be used as a general milliohm meter.
Here I am testing on some resistors and comparing to a very precise meter.
The precision is very good.

volt

The same with voltage, again the precision is very good and it has lots of digits.

10ohm

The meter is using a 1000Hz sinus for measuring the resistance

21.9ohm

The maximum AC voltage is about 30mVpp when measuring 22 ohm.

220ohm

The maximum AC voltage is about 300mVpp when measuring 220 ohm.

unloaded

With unloaded outputs the voltage will be considerable higher at about 5.3Vpp



Tear down

DSC_7415

I had to remove four screws to open the box.

DSC_7416

it is a standard project box with some machining and a custom frontplate.

DSC_7417

The circuit is on two circuit boards, one for the display and one for everything else. The used battery is a LiIon 18350 cell marked with 900mAh.

DSC_7418

Four more screws and I could remove the circuit board.

DSC_7425

Markings has been carefully removed from nearly all the chips.

DSC_7419

DSC_7420 DSC_7422

DSC_7421

DSC_7423
DSC_7424

DSC_7426 DSC_7427

Before removing the display board I unsoldered the battery (Only one connection).

DSC_7428

There are two mechanical relays and space for a usb interface chip (U7). There is 5 trimpots to calibrate it with.

DSC_7429



Conclusion

This milli-ohm meter is very good and can both be used to measure internal resistance in batteries and to measure small resistors with. Because it uses AC it will give too high reading on anything inductive, but measuring resistors and small metal pieces works fine.

When using it as a milli-ohm meter the Chinese text is not a big problem, but it is a bit tricky to change any options or use the more advanced functions.



Notes

As reference I used my Keithley DMM7510, it can do 4 terminal ohm measurement.

Vapcell Internal Resistance Tester YR1030
Internal impedance/resistance of batteries

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/