Their simple connections eliminate the isolation and noise current problems that plague other solutions. I noticed you selected 0 A for both the current start and stop values. Voltage compliance which limits the amount of voltage applied when sourcing a current is critical for applications in which overvoltages could damage the device under test DUT. Also, have you contacted Keithley to ask them about it as they will have developed this to be used as a subVI and will probably want to know if it doesn’t work correctly. Simple Programming Both current sources are fully programmable via the front panel controls, or from an external controller via RS or GPIB interfaces. Message 5 of

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Research determining the transition temperature of superconductive materials I-V characterization of a material at a specific temperature Calorimetry Differential thermometry Superconductivity Nanomaterials Metrology Intercomparisons of standard cells Null meter for resistance bridge measurements.

Once the and A are connected properly, the user simply presses the current source’s Delta button, followed by the Trigger button, keothley starts the test. When i run the vi as a subvi in my larger programme however as I need to doit returns an array with the correct number of elements, but with the first stored value in all of the elements of the array.

leithley This current reversal technique cancels out any constant thermoelectric offsets, ensuring the results reflect the true value of the voltage. When I read out the buffer, the vi returns an array with all elements the same, and equal to the first element in the buffer wich I can read out from the keithley by using the front panel.


Is this a VI that you had created? Message 6 of Doesn’t that kinda raise a flag? I know i can also address the A via the ‘s vi’s and a rs cable, but i want to address it directly via GPIB for added flexibility. I am using the Keithley buffer read.

Keithley Nanovoltmeter – Instrument Driver – National Instruments

Since this is an executable and I am unable to view the Block Diagram, I cannot troubleshoot the code. I am trying to use the “differential labviwe mode” in software “KI Lower stimulus currents produce lower – and harder to measure – voltages across the device.

I think that the plus with the conductance measurement software from Keithley are designed for resistor-like device: As a side note: Message 1 of 5. Is it a timing issue that when run as a subvi it only reads the first element? I believe the vi was originally made for LabView 8.

Keithley 2182

Appreciates for any advices. Are you able to take a voltage sweep on a transistor?

Essentially, delta mode automatically triggers the current source to alternate the signal polarity, then triggers a nanovoltmeter reading at each polarity. In my case, I need to plot a 3-D graph which has source-drain voltage Xgate voltage Y and conductance Z.


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Most Active Software Boards: Mathematically, differential conductance is the derivative of a device’s I-V curve. Even small amounts of heat introduced by the measurement process itself can raise the DUT’s temperature, skewing test results or even destroying the device. For some reason, I was unable to open the data sheets and manuals on Keithley’s website. I use the A nanovoltmeter in conjunction with a current source, connected with a trigger link cable.

The output voltage can be set from 0.

Message 2 of 5. From this package, users jeithley print out the instrument commands for any of the pre-programmed functions, which provides a starting point for incorporating these functions into customized applications. I tried running the program in “Demo mode” with your same settings, and the run was successful, without throwing a warning.

This may be the source of the warning; the sweep is starting and stopping at 0 A. Delta Mode Keithley originally developed the delta mode method for making low noise measurements of voltages and resistances. Message 7 of I want to edit the program and make it convenient to me, as I suppose with my limited labview knowledge it will take more time if I strat from scratch.