what is the constant current used to measure the Resistance with the 4072 DMM?

[SamEJ]

Hi I have a PXI 4072 DMM.

During the resistance,diode, measurements the DMM is said to use a constant current method to test the resistance. I'd like to know what is the waveform used to measure the resistance (sine, squeare??) and what is its frequency. I'm assuming its a sine wave but I'm not entirely sure. Does anyone have any details about this? Also is there a way I can graph the test current?

Regards

Sam

[Mark_E]

Sam,

For both resistance and diode measurements, a constant current is used. More of the details can be found within our awesome help file. (It should be on your computer, as it is also installed with the NI-DMM driver.) Navigate to Devices >> NI 4072 >> DMM Measurements >> Resistance (or Diode) for the specific details on what current value is used (because it changes with range). I'm not sure you'd want to graph it as it's just DC, but a hall effect sensor is one way to do it.

The measurements that use a non-DC current are capacitance and inductance measurements of the NI 4072. I will again refer you to the same path as above, except you'll select the Capacitance/Inductance "book" to read about.

I hope that helps!