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6487 - - Ohm Measurement

2502, 6485, 6487 - Support
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Brian.Congdon
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6487 - - Ohm Measurement

Post by Brian.Congdon » May 29th, 2015, 7:18 am

What is the maximum possible ohm reading that can be measured by the Keithley 6487?

Dale C
Keithley Applications
Keithley Applications
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Re: 6487 - - Ohm Measurement

Post by Dale C » May 29th, 2015, 9:01 am

In theory, the 7485 can source up to 500V.
and it can read down to 1e-14A.
So 500 V / 1e-14A = 50 e17 ohms.
But that is not practical.
So the offset current is about 0.4pF. So I would use that to find out the max resistance.
500V / 0.4pA = 1.25 e15 ohms.
Make sense?

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