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Hey guys... Just thought I'd post an update in case anyone else has a similar problem: Finally fixed the problem... I tried one those HCPL-7510 parts but could not make it last. Problem was that the measuring side could not be isolated from the other side... The measuring side is measuring...

Compositpro: I would think it would be hard to get consistent and accurate results in the micro-amp range... Probably possible but I bet it'd be a pain. BrianG: Yes and unfortunately a brief arc means that even a fairly low inductance return path can see hundreds of volts on the IC... And with...

Hey guys I'm back. Did some expirments with some opto-couplers and found that the DC level thing will be a big issue. The ones I have lying around are 1:1 ratio, 15KV (IIRC) and rated for up to 40mA. They appeared to be most linear in 20-30mA range but they were not stable... They tended to...

Thanks so much for the replies guys... Some good ideas here. BrianG: I have not tried spark gaps. I know they were common for use in CRT video amps because they had no leakage and very little capacitance (this made them preferable in applications were there was a high speed video signal) but...

Hi all, My first thread so hopefully I am posting in the right forum/format/etc. Looking for advice on the best isolation device to use for analog signals. Heres the problem: The circuit (this part of it anyway) is a device for measuring the cathode current of a high voltage vacuum tube (we...