Products > Test Equipment
SM8124 Battery Impedance Meter
kripton2035:
shouldn't be too hard to reverse the schematic it seems ?
flywheelz:
Looks like the 2 to 3 milliohms offset is a common thing with these testers. I also noticed it has temperature drift.
DBoulanger:
I have to admit, I wasn't too impressed about the soldering job. Far from professional.
I just checked on Banggood and the SM8124 is sold out. They now have the SM8124A which at first glance has pretty much the same specs. The only obvious difference is the probes which have 2 pins each instead of "concatenated" ones.
It is around $64 USD.
I guess you have to have a need for this type of meter. When someone has only few batteries, it might be rather difficult to justify.
kripton2035:
you can still find the SM8124 on ebay, at a better price
https://www.ebay.com/itm/Portable-Battery-Internal-Resistance-Meter-Voltage-Tester-Voltmeter-SM8124/162812601314?
DBoulanger:
Hi,
Thank you for the link.
I had to share what I found on that listing, I thought it was too good to let it go without any notice.
We pretty much all know that the main purpose of this meter is to measure battery impedance, right ? Well, I guess the person who took the pictures for the listing wasn't aware of this.
Just for the fun of it, here are 3 pictures that were part of the listing however 2 of them raised some concerns.
AA Battery : That one is pretty much OK. The voltage is within a good range but if you're like me, I would have been more interested at seeing the battery's ESR.
CellPhone Battery : This one is rather convincing. The battery is REALLY dead !!! Expecting something in the 3.7V range or so, I'm pretty sure we can call it DEAD while showing 1mv ! What bugs me though, is the fact that the meter still in the 2V range selection. Was the user expecting such a low voltage to leave it on the 2V scale ? Once again, no ESR.
9V Battery : Once again, the photographer had pessimistic anticipations. He left the unit on the 2V scale and astonishingly the reading is within the range with a whopping 1.233V !!! With that voltage who cares about the ESR, right ?
Either he had a very bad battery inventory or his supplier pulled a quick one on him !
So globally it is amusing at times to see how some sellers may have rather limited marketing skills.
I'm not perfect but I think that with very minimal effort I would have done better. I'm sure a lot of people would have too.
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