Using a DMM to measure output isolation/crosstalk

? 2016?8?8???? UTC+

ee 5 Volt converters, one 15 volt converter, and a converter with +/- 12 vo lts DC.

ch other. I want to make sure that there is isolation between all the suppl y outputs. The +/-12 supply shares the same common between them, but I"ll h ave to check to make sure that common isn't shorted to the +15volts for exa mple. These components were from

have the DMM in VDC mode. After the line/load regulation test, I leave the positive lead of the DMM on the first supply, then I move the negative lead to each supply. I should measure the supply voltage output of the first su pply, then zero VDC moving the negative lead to each supply.

test all the negative pins making sure they are 0 VDC.

ly?

lead to each supply making sure it is also 0VDC, or would this step be red undant?

? 2016?8?8???? UTC+

C+8??4:45:31?Chuoiujk???

hree 5 Volt converters, one 15 volt converter, and a converter with +/- 12 volts DC.

each other. I want to make sure that there is isolation between all the sup ply outputs. The +/-12 supply shares the same common between them, but I"ll have to check to make sure that common isn't shorted to the +15volts for e xample. These components were from

I have the DMM in VDC mode. After the line/load regulation test, I leave th e positive lead of the DMM on the first supply, then I move the negative le ad to each supply. I should measure the supply voltage output of the first supply, then zero VDC moving the negative lead to each supply.

d test all the negative pins making sure they are 0 VDC.

pply?

ve lead to each supply making sure it is also 0VDC, or would this step be r edundant?

ID=844/image] Here is the image. I hope this could help you understand my question.

We test multi-channel isolated things by making a string-of-resistors voltage divider powered by some DC. Each tap on the string goes to one channel. We measure all those tap voltages to demonstrate isolation to ground and between channels.