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A.C. Impedance measurements with Labview & Keithley 2400

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A.C. Impedance measurements with Labview & Keithley 2400

Post by thessel » June 5th, 2019, 9:00 am

I would like to know if it is possible to make measurements of impedance by programming a frequency sweep on Labview up to 10 MHz. The program will send a sinusoidal voltage to a Keithley source meter and measure the resulting current from a material.

Andrea C
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Re: A.C. Impedance measurements with Labview & Keithley 2400

Post by Andrea C » June 9th, 2019, 8:00 am

A SourceMeter such as model 2400 is not suitable for what you describe.

Even when SourceMeter is used for AC impedance, two are required. One to apply the voltage sine wave; and one to measure the current in time sync.
This can give you the Z and phase shift.
Even so, the freq of the resulting sine waves that you can generate with a SourceMeter will be a few hundred Hz in best case.

Some SourceMeter models, 2600B in particular, has dual A/D converters, so can in theory get by with one meter and do both I and V. But sine wave freq will still fall short of your 10MHz freq.

You need an LCR meter or the 4210-CVU.

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