How can I protect a picoammeter or a picoscope in HVDC measurements?

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Malaoui Abdessamad

It is preferable to avoid ohmic connections by resistances. I propose to use a follower Aop (high impedance input amplifiers) to measure the current.

Ajith John Thomas

Anti parallel diode with series resistance..

Olanrewaju Lasabi

Thanks for all these answers.

But what about going with the second option and connecting a Zener Diode in parallel to the picoscope, can it work?

Please note that this is a very high DC voltage (up to 250KV).

U. Dreher

Would you please supply some schematic of your setup? It is a bit difficult to judge, based only on your textual description.

okay, Something like the picture attached.

R1=5kohms , R2=50ohms the picoscope has an internal resistace R3=1Mohms and internal capacitance C1=13pF and the limits of its input are -20V to +20V.

So I'm thinking again, what if I connect a zener diode accross R2, can it protect the picoscope?

Thanks

or a combination of a discharge tube and a zener diode?

Amlan Chakrabarti

I know of industrial applications in Aluminum industry where they use hall effect transducers are used in clusters of parallel circuits for measurement of high current DC. We may use cluster hall effect transducers in series to to connect a picoammeter. It would provide the desired isolation.

Regards,