Decformations

Posté par davefollmers le Ven Juin 01, 2018 09:23

Hi,

We are having an issue with the Keithley 6430 Current source. Out DUT has JFETs on its inputs, which are connected to the current source. When the current sources are off and the DUT is powered down, the triax cables are moved from one JFET to another. Sometimes when this change happens, the JFETs are damaged and begin to leak between their gate and source, sometimes to the mA level.
The output off mode is set to normal. Is there something about this configuration that could be inducing a shock into our DUT?
Also, we took similar actions with the 6220 current sources, but did not see damage. Is there a difference between the 6220 output off mode and the normal output off mode of the 6430?

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
https://forum.tek.com/viewtopic.php?t=125440
Collaboration Solution Video

Thank you.