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DMM Voltage Measurement (Load Current)

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danner123

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When measuring a voltage with a DMM does the the DMM see the current across the two points probed?

For example, if I have a circuit that draws 2.5Amps across a load. If I measure the voltage across that load, do I need to worry that I will damage the DMM because of the 2.5A current flowing across the load?

Thanks!
 

No. The DMM is a high impedance when measuring voltage, so very little current will flow into it. If a significant current DID flow, that would mess up the voltage measurement.
 
you should connect the probe in series to the load.
Ensure the multimeter probe connected to the Ammeter prob.
 

barry said:
No. The DMM is a high impedance when measuring voltage, so very little current will flow into it. If a significant current DID flow, that would mess up the voltage measurement.
Click to expand...

It depends on the size of the load resistor. If he has a 1 Kohm load resistor, 2.5A would give him a 2500 volt potential across the resistor. that could exceed most voltmeters max voltage.
:lol:
 

RobertFalbo said:
It depends on the size of the load resistor. If he has a 1 Kohm load resistor, 2.5A would give him a 2500 volt potential across the resistor. that could exceed most voltmeters max voltage.
:lol:
Click to expand...

That was an answer to a totally different question.
 

danner123 said:
When measuring a voltage with a DMM does the the DMM see the current across the two points probed?
Click to expand...
No You cant see the Current ,But you can calculate the curent by mesuaring the Voltage with and without Load.


For example said:
Yes You can mesure with DMM but the mesuaring voltage that should be in the range of you are mesuaring .
Click to expand...
 
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