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Jun 14, 2009, 12:17 AM
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New Zealand, Auckland
Joined Dec 2008
210 Posts
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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
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Le Treport, France
Joined Jun 2004
1,316 Posts
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Quote:
I have two models here : - a µMetros 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 |
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Last edited by Acetronics; Jun 15, 2009 at 04:05 AM.
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Jun 15, 2009, 01:20 AM
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New Zealand, Auckland
Joined Dec 2008
210 Posts
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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 |
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Jun 15, 2009, 04:08 AM
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Le Treport, France
Joined Jun 2004
1,316 Posts
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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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