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What does this PSU feature do?
What does this PSU feature do?
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Old 6th February 2021, 02:37 PM   #1
miaulon is offline miaulon  Germany
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Default What does this PSU feature do?

Hi everyone!

I recently got an old 1970s regulated power supply unit off of ebay. Ive tried looking for info on the manufaturer and had no success...


I want to ask you if anyone knows what is meant with the resistor connection thats printed on the positive outputs labeled V and I. This might be a newbie question, but i haven't had experience with this kind of PSU.

Thank you for your help!Click the image to open in full size.
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Old 6th February 2021, 03:09 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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The purpose is to monitor the current flowing through the load.
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Old 6th February 2021, 03:19 PM   #3
jjasniew is offline jjasniew  United States
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What does this PSU feature do?
Why would it be "1/R"?

To set the current, i.e. hook up a 10 Ohm and you get 100 mA out when it's in constant current mode? Seems Bizarre -
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Old 6th February 2021, 03:38 PM   #4
miaulon is offline miaulon  Germany
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jjasniew: Yeah it just feels odd. I wish I could find a manual for it! I have the feeling I am missing something. But why make it go into constant current mode in that way if there is a switch to put the PSU into const. current though?


JonSnell: Maybe for an external meter? The PSU has a meter built in.


I suppose I'll have to re-cap it and just test to see what it does.
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Old 6th February 2021, 03:57 PM   #5
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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That is for an external meter.
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Old 6th February 2021, 04:51 PM   #6
miaulon is offline miaulon  Germany
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Thank you for your help!
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Old 6th February 2021, 04:58 PM   #7
Mooly is offline Mooly  United Kingdom
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What does this PSU feature do?
I have a couple of Farnell PSU's with a similar set up. The manual describes how to use the feature and why it exists. Yours will be the same...

Have a read at the pdf file.
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File Type: pdf Farnell PSU LT30.pdf (415.9 KB, 4 views)
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