Products > Test Equipment

SM8124 Battery Impedance Meter

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Mosaic:
There is a precision opamp https://www.analog.com/media/en/technical-documentation/data-sheets/AD8221.pdf
It outputs a 1Khz square wave based on its 2 inputs of a 1Khz sine and a halfwave 1Khz sine.. Same sine that appears at the red input lead.
This Sine wave is reduced significantly when the input leads (black & red) are shorted to evaluate  impedance.

I note that soldering a shorting wire across the PCB input lead joint reduces my Meter's zeroing error from 1.5mΩ to 0.5mΩ. So some benefit can be had by improving the gauge of the input lead wiring.
I suspect full zeroing can be achieved by augmenting the leads PCB input traces with solder tinning or a copper wire.  I have yet to try this.

I have a failed SM8124 which I will disassemble first before tampering with the working unit.

Maximus Panin:
I'm also looking for my first tester. I choose between YR1035+, SM8124A, Volcraft BT-501 - which is better ?

Maximus Panin:
YAOREA-YR2050

kripton2035:
YR2050 is a DC milliohm meter. it cannot measure battery internal resistance. you need an 1KHz AC ohmmeter for that.

there is also the RC3563 that seems a good candidate. (better than the SM8124 IMHO)
https://www.aliexpress.com/premium/rc3563.html

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