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High Voltage probes on usb scope?

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High Voltage probes on usb scope?

Postby cinmay » Sun Dec 22, 2013 8:42 pm

Hi.

I want to measure high voltage signals. Anything from mains 230V up to maybe 5KV or more. It's some sort of crazy resonance circuit.
But I am a bit skeptical to hock up my old Picoscope 2204 to that kind of voltage. Do any of you have experience doing this? Can I use a regular high voltage probe?
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Re: High Voltage probes on usb scope?

Postby Martyn » Tue Dec 24, 2013 11:01 am

Mains will require high voltage active probes, so proceed with extreme caution.

Please contact support@picotech.com for further advice.
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Re: High Voltage probes on usb scope?

Postby cinmay » Fri Dec 27, 2013 12:17 pm

Thanks :)
I'm considering using an op-amp buffer circuit in front of the probes rather then expensive active probes. This way I will know what goes in to the picoscope and if anything goes wrong the buffer will blow up rather then the scope. It will probably mess with my signal but I don't need the measurements to be 100% accurate. Will this be a ok solution?
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Re: High Voltage probes on usb scope?

Postby PeterF » Fri Dec 27, 2013 3:46 pm

Hi,
Active differential & high voltage probes are expensive for a reason and that is safety. Please don't mess with high voltages unless you really know what you are doing. An Op-amp circuit is no protection for the scope or operator when things go wrong! Please look at the specifications of our high voltage differential probes:-
http://www.picotech.com/oscilloscope-accessories.html#active
Regards,
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Re: High Voltage probes on usb scope?

Postby cinmay » Tue Dec 31, 2013 12:29 pm

I definitely see your point. As you probably guessed I'm a bit skeptical to this entire circuit. There are too many unknown variables here. Ill have a look at the probes but I'm guessing Ill end up bringing it to a proper high voltage lab before turning the darn thing on and try to fix it.
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