Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

how do I isolate DVOM probes from the power source

Status
Not open for further replies.

tesla2008

New Member
I have this DVOM:**broken link removed**
https://www.rpelectronics.com/Defau...sp&Detail=/English/Content/Items/PM-1029A.asp


DVOM uses 9V for power display and electronics

A 24v battery and a linear voltage regulator (set at 9V) feeds the circuitry of DVOM. I can measure any DC voltage within its preset range (0 to 200V) as long as that is part of separate circuit, say a battery, another power supply etc.

but when I try to measure the voltage on same battery pack that feeds the voltage regulator the DVOM digits disappear and only couple of segments are displayed in first digit.
removing the ground DVOM probe from the circuit restores the digits to "0000".


apparently negative/ground for 9V DVOM and negative/ground probe do not play well.


so, how do i isolate those two negatives from each other so that I can measure the power from same battery pack that feeds the DVOM via voltage regulator?
 
Last edited:

MikeMl

Well-Known Member
Most Helpful Member
Buy a dPm that includes the isolated power supply. Or build a switcher with an isolated winding on the inductor
 
Status
Not open for further replies.

Latest threads

Top