Meausing voltage across a shunt resistor with an oscilloscope
Meausing voltage across a shunt resistor with an oscilloscope
(OP)
Hi,
I am trying to measure the voltage across a shunt resistor with an oscilloscope (actually, one of Yokogawa's 'ScopeCorders'). Since a DC current flows through this resistor in two directions, neither end is at ground potential.
Can this voltage be measured with a single voltage probe?
If not, would this be an application for a diff probe?
Thanks,
David
I am trying to measure the voltage across a shunt resistor with an oscilloscope (actually, one of Yokogawa's 'ScopeCorders'). Since a DC current flows through this resistor in two directions, neither end is at ground potential.
Can this voltage be measured with a single voltage probe?
If not, would this be an application for a diff probe?
Thanks,
David





RE: Meausing voltage across a shunt resistor with an oscilloscope
If you only want to measure low frequencies, below - say - a few hundred Hz, and your circuit is isolated from the mains (battery powered, for instance), then you can use a standard scope input.
In all other cases, you need either a differential input or an external differential probe.
As I said - it depends. If mains connected, do not do it.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Meausing voltage across a shunt resistor with an oscilloscope
Bill
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"Why not the best?"
Jimmy Carter
RE: Meausing voltage across a shunt resistor with an oscilloscope
Even when a resistor is tied to "circuit ground," the circuit ground itself may actually be incidentally coupled to the AC mains. Since scope grounds tend to tied to actual and real AC grounds, spectacular results may ensue.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Meausing voltage across a shunt resistor with an oscilloscope
I'm unclear of the difference between the "actual and real" AC grounds. Would you mind elaboarting?
Thanks,
David
RE: Meausing voltage across a shunt resistor with an oscilloscope
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Meausing voltage across a shunt resistor with an oscilloscope
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If we learn from our mistakes I'm getting a great education!
RE: Meausing voltage across a shunt resistor with an oscilloscope
RE: Meausing voltage across a shunt resistor with an oscilloscope
This is the 21st Century you know!
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: Meausing voltage across a shunt resistor with an oscilloscope
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Meausing voltage across a shunt resistor with an oscilloscope
RE: Meausing voltage across a shunt resistor with an oscilloscope
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Meausing voltage across a shunt resistor with an oscilloscope
RE: Meausing voltage across a shunt resistor with an oscilloscope
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Meausing voltage across a shunt resistor with an oscilloscope
Thanks.
RE: Meausing voltage across a shunt resistor with an oscilloscope
Glenn
RE: Meausing voltage across a shunt resistor with an oscilloscope
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Meausing voltage across a shunt resistor with an oscilloscope
A.
RE: Meausing voltage across a shunt resistor with an oscilloscope
KCPS: kilo-cycles per second. Directly equivalent to kHz. Used by oldtimers who learned their craft in The Good Old Days.
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If we learn from our mistakes I'm getting a great education!