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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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