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Jun 14, 2009, 12:17 AM
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ESR meter to test Nicad/NiMH ??


Hi there. Has anyone used a ESR meter to test Nicad/NiMH ??
Basicly compare the internal resistance of batts to pick out bad batts.
I wonder if I'd get any useful measurements/results.
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Jun 14, 2009, 07:37 AM
"MAYONNAISE"
Acetronics's Avatar
Quote:
Originally Posted by 1101
Hi there. Has anyone used a ESR meter to test Nicad/NiMH ??
Basicly compare the internal resistance of batts to pick out bad batts.
I wonder if I'd get any useful measurements/results.
Hi, 1101

I have two models here :

- a ÁMetros from Mr Cam ( DIY )
- a RIM 1000 from Conrad / ELV ( Germany )

Both work pretty well ... and give same results.

But which results !!! a bit far from the 1Khz tests ( significative ??? ) of cell constructors ... but true.

One thing is sure : it is a very good instrument to detect cell differences ... It can also show the charging state , as internal resistance is a function of charge ( and rest ...)

Don't be sad when you will discover batts are " not so perfect " ...

Alain
Last edited by Acetronics; Jun 15, 2009 at 04:05 AM.
Jun 15, 2009, 01:20 AM
Registered User
Hi Alain

I'll give it a try them. My ESR is DIY as well.
Ive a pretty good idea what cells are 'off' on my old nicads, not sure with my NiMh
Do the batts need to be discharged first ??

Would a bad cell give a higher voltage across that cell in the pack when discharging (due to higher than normal internal resistance)??

Cheers
Steve
Jun 15, 2009, 04:08 AM
"MAYONNAISE"
Acetronics's Avatar
Hi, Steve

The best to do is charge the cells and let them aside for two or three days ...

Then you measure.

A bad cell will give LOWER voltage than others during discharging ... even invert its polarities ...

And remember NiMh internal resistance can vary a lot with discharge state or rest ( moreover the AA and AAA " High capacity " cells !!! )

C Size do not show a huge variation ... THEM.

Alain


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