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Problem Sorted..!!!
It seems the over reading was caused by the leakage inductance of the transformer, where the capacitor partially resonates with the inductive component to give a greater current than the short circuit.
Many thanks to 'Jimmc' from EEVblog for this insite.
This has now been...
HI duffy, Thanks for you kind Information on charge pump effects and explination, I'm learning something new here.
It sounds to me like that could well be the cause, I'll have to wait until friday before i can get back to it.
Cheers
Hi Duffy, thanks for your reply, Yes 10uf electrolytic for C3 as per ludens circuit.
I'll play around with C3 and see what's what, it's just taking the 100k signal accros R6 to the op-amp at 40k load.
If it's C3 'charge pump characteristic' why will this only happen measuring 'non polar caps' ...
Hi I'v just finished an ESR meter based on Ludens circuit, which seems to work very well. I did a small mod to broaden the range a bit, so 4.7 ohm is below mid scale great. Works fine.
Here's the Puzzle!.
I short the test leads out to zero the meter fine.
Then If I measure a 'NON...
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