Replacing meters in bench power supply

artb · 20th August 2006, 04:22 AM

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

AndrewT · 20th August 2006, 06:15 AM

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.

dnsey · 20th August 2006, 11:19 AM

If you want to do it on the cheap, use a bargain basement multimeter (suitably adapted and powered).

20th August 2006, 04:22 AM	#1
artb diyAudio Member Join Date: Sep 2005	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

20th August 2006, 06:15 AM	#2
AndrewT diyAudio Member 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. __________________ regards Andrew T.

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20th August 2006, 11:19 AM	#3
dnsey diyAudio Member 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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