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Model 248 Earth Ground

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Joined: April 23rd, 2013, 3:40 pm
Country: United States

Model 248 Earth Ground

Post by Ben_UNT » April 23rd, 2013, 3:48 pm

I apologize if this is a trivial question but why is there no earth ground connection on the back panel of the model 248 high voltage power supply? I understand that the device under load should have a grounded safety shield during operation but I don't get why the power supply is not grounded too. I am using this power supply for field emission experiments and I don't want to damage it with arcing. What are you recommendations for this issue?

Jane S
Keithley Applications
Keithley Applications
Posts: 114
Joined: November 10th, 2010, 5:45 pm
Country: United States

Re: Model 248 Earth Ground

Post by Jane S » April 24th, 2013, 1:15 pm

The 248 has an OVP circuitry to avoid arcing.

This is explained in the datasheet (Model 248 High Voltage Supply and Technical Information - DC Power Supplies)

See link below;
http://www.keithley.com/support/keidoc_ ... Data+Sheet

In addition, the E-handbook there's a number of applications for additional information.

http://www.keithley.com/support/keidoc_ ... e=Brochure

I hope this helps.


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