Old 03-07-2014, 02:58 AM #1
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Default Panel meter - common ground

Edit: Topic changed.

Okay, so I still have not finished building my CC/CV PSU (thanks to djQUAN for a lot of help) because of some circumstances.

Anyway, I've ditched my plan of getting a particular panel meter and just go cheapo. I'm looking at this ammeter.

It says that it needs an isolated power supply but I don't want to add an isolated module to save some space on the pcb. Is there a way to use this on without an isolated supply? Something like a differential input? I don't even know how it works.

I've seen similar meters that do not have a built in shunt but the pcb and components look the same and in the description I found this diagram (below). Would this work with the meter above?





Edit again: Since the meter I'm looking at has a built in shunt, I'm thinking about connecting its input to the negative side of the circuit I need to measure. Is this gonna work?



Last edited by Zeebit; 03-07-2014 at 09:54 AM. Reason: grammar; thread change
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Old 03-07-2014, 04:59 AM #2
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Default

Yeah, but I just want to know if somebody has one of these meters so that I could know the resistance before I buy one.

Thread changed.

Last edited by ped; 03-07-2014 at 09:45 AM. Reason: double post
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Old 03-07-2014, 02:26 PM #3
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Default Re: Panel meter - common ground

Meter shunt are the two white ceramic resistors beside the current input wires. I'm guessing they are two 0.1ohm resistors in parallel.
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Old 03-08-2014, 03:55 AM #4
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Default Re: Panel meter - common ground

I'm thinking about getting that meter with the built in shunt. Can I use it without an isolated supply?

Here is my setup:

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Old 03-08-2014, 04:25 AM #5
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Default Re: Panel meter - common ground

I think it should work.
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Old 03-08-2014, 05:41 AM #6
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Default Re: Panel meter - common ground

Time to give it a go then.

Care to explain why this method works with meters that require an isolated power supply?
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