High Voltage Isolation

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cgervasi
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High Voltage Isolation

Post by cgervasi » Mon Jul 09, 2018 4:49 pm

We are trying to measure a 2V signal across a current resistor at -17kV from ground.
HV_Isns.jpg
There is no way we can put the resistor on the ground side.

We can measure this signal with a multimeter, taking care to keep it isolated. But can anyone thing of a trick to log data from it for a long period of time? The must be some trick, perhaps with a current mirror and an opto-isolator, to get the voltage down to low voltage levels.

bennog
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Re: High Voltage Isolation

Post by bennog » Tue Jul 10, 2018 8:53 am

Working on high with home made circuitry is very dangerous.

It is better to use a special crafted instrument for this

https://nl.rs-online.com/web/p/multimet ... s/4428294/

You can attach this to the picoscope and measure over long periods of time.

Benno

cgervasi
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Re: High Voltage Isolation

Post by cgervasi » Tue Jul 10, 2018 9:55 pm

bennog wrote:Working on high with home made circuitry is very dangerous.

It is better to use a special crafted instrument for this

https://nl.rs-online.com/web/p/multimet ... s/4428294/

You can attach this to the picoscope and measure over long periods of time.
Thanks for replying.

I already have that high voltage probe.
Image

I need to monitor 8 channels. I'd like something like the PicoLog 1000 that I could power by battery and read wirelessly in a PC or phone app.

Martyn
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Re: High Voltage Isolation

Post by Martyn » Wed Jul 11, 2018 5:56 am

The PicoLog 1000, as with all our devices, will require a permanent connection to a PC to provide power and also collect the data.
Martyn
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