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keithley 6487 measuring current at 5 kV

2502, 6485, 6487 - Support
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Joined: May 30th, 2019, 12:27 am
Country: Italy

keithley 6487 measuring current at 5 kV

Post by fiorrr » May 30th, 2019, 12:40 am

Hello to every one,

I have a Keithley 6487 and I need to measure currents on a high voltage line (MAX 5 kV).
I know this - has the max input voltage at about 500V, but one technician in my institute suggest me that probably it exists some external module to perform measurements at a higher voltage (up to 5 kV or more).

Does this module exist? If not, there is a way to perform this measurement with this instrument or do I have to switch to another instrument?

Thanks for your time :)

Dale C
Keithley Applications
Keithley Applications
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Joined: June 10th, 2010, 6:22 am
Country: United States

Re: keithley 6487 measuring current at 5 kV

Post by Dale C » May 30th, 2019, 10:48 am

do you need an external source of 5kV? Or do you need to float the 6487 at 5kV?
Model 6487 has its own voltage source built in. With a max output of 500V.
But if you are testing at DUT at 5kV, then make sure you do not float the 6487 at more than 500V.
Attached is a document showing a protection circuit when using high voltage with the 6487 and Keithley -.
Again, do not float the -, instead float the DUT.
Hope this helps.
Dale Cigoy
Keithley technical support
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