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Keithley 248 Input Voltage Selection Key

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Joined: November 19th, 2012, 12:45 pm
Country: Romania

Keithley 248 Input Voltage Selection Key

Post by gunnar » November 19th, 2012, 12:58 pm

Hi guys,

I have a question regarding the small board that serves as voltage selector for the mains voltage.
I had a problem on a 248 model - 220V mains when 120V key selected - and opened it up suspecting a blown trafo.
Analyzing the possible voltage selections I noticed that for 220V & 240V mode, one of the windings of the transformer gets shorted (green & brown).
Is this the intended way of going or do I have something messed up in here?


Dale C
Keithley Applications
Keithley Applications
Posts: 2845
Joined: June 10th, 2010, 6:22 am
Country: United States

Re: Keithley 248 Input Voltage Selection Key

Post by Dale C » November 28th, 2012, 8:59 am

This is a service issue.
Please contact the local Keithley service center.

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