Digital Multimeters (DMMs) and Precision DC Sources

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SMU 4139 resistor

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I have a question about the SMU 4139.

He is able to program the output impedance/resistance.

Can his output be used to simulate a resistance? Floating? Or is it always stuck to ground.

 

thx.

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Accepted by topic author kdCMC

Hi kdCMC,

 

You can program the NI 4139 as a programmable load.  The attached example allows you to use the programmable output resistance functionality to directly program the device's resistance.  To accomplish this in DCV mode, set the output voltage to 0 V and set the Output Resistance to a valid value for the given Current Limit Range.  In DCI mode, set the output current to 0 A and set the Output Resistance to a valid value for the given Current Level Range.

 

The valid resistance values are showed below (copied from the spec document😞

 

Untitled.png

 

Note that the valid resistance values depend on whether you are in DC Voltage or DC Current mode.  The value values also depened on the Current Limit Range or Current Level Range that you have programmed.

 

The load will still be floating unless you physically short the LO terminal to chassis GND.

Regards,

Jared R.
Precision DC Product Support Engineer
National Instruments
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