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Old 20th August 2006, 04:22 AM   #1
artb is offline artb  United States
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Join Date: Sep 2005
Default Replacing meters in bench power supply

I picked up a Sorenson SRL40-25 lab power supply from the Pratt and Whitney surplus store on Sat. I orginally I was hoping to get an oscilloscope but $10.60 for a PS, couldn't hurt to take a chance right? Voltage and current meters look a little worse for wear, especially the voltage meter. So here's my question(s) for the board: can I replace the analog meters with digital meters and if so what are some recommendations?

I haven't had a chance to actually plug it in yet cause it's a heavy mother.

thanks
art
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Old 20th August 2006, 06:15 AM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Hi,
3.5 digit meters are fairly cheap.
Add a resistive attenuator to change the scale from 1.999V to 199.9V and just don't use the top half of the usable range (ruins sensitivity unfortunately). Maybe a press and hold button to temporarily decrease scale to 19.99V might be a nice to have). or buy more expensive 3.75 digit meters (4000 or 6000 count instead of 2000 count).

Similarly, add a current shunt to get your 1.999V scale to read the correct current.

Fit current and voltage meters, very handy.
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regards Andrew T.
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Old 20th August 2006, 11:19 AM   #3
dnsey is offline dnsey  United Kingdom
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Join Date: Mar 2004
Location: Shropshire, England
If you want to do it on the cheap, use a bargain basement multimeter (suitably adapted and powered).
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