LCR Compensation with PXI4190

[Arkaru]

Hello everyone,

so i am trying to compensate the PXI 4190 LCR module, because we use it within a complex test fixure, in order to measure capacitance and resistance. I tried to follow the following guide, but it does not really come with a hands-on example:

https://www.ni.com/docs/de-DE/bundle/ni-dcpower-compensating-lcr-measurements/page/ni-dcpower-compen...

For instance, in the chapter "Generating Custom Cable Compensation Data" it says, that "Get LCR Custom Cable Compensation Data" should be called for multple sets to generate a discrete data set for each set, which then "can be tracked"... My question is, what is that supposed to mean? "can be tracked"? What would be a way to track it? 

For example: I have over 30 testpoints, which according to the guide need to be individually compensated. Does that mean i have to create 30 wire for each testpoints after creating at least 30 data sets after 30 individual compensation, just so i can use it in the corresponding part in the code? 
Can someone show me an example by any chance please?

Thanks in advance!

[santo_13]

Probably best to reach out to NI Support or your NI contact to get more example or detail.

PXIe-4190 is a niche and not a lot of knowledge is available in the public.

[snh93]

Hi all,

I am having similar questions. I noticed that on-board storage only save the latest open/short/load compensation data, but that means the compensation data is extrapolated with frequencies other than the ones you tested. I noticed that we can directly set the property nodes to input the open/short/load compensation resistance/reactance...etc, but where are these values come from?

As you mentioned, the compensation document does not really talk about how to exact these values from on-board memory after compensation is conducted. The niDCPower Get Compensation Data.vi gives output of an array of unsigned 8bit integer, which is hard to interpret.

Can I assume that I can directly conduct measurements under open-circuit, short-circuit, and known load conditions and use the output impedance to calculate those values?

Thank you

[Arkaru]

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@snh93 wrote:

Hi all,

I am having similar questions. I noticed that on-board storage only save the latest open/short/load compensation data, but that means the compensation data is extrapolated with frequencies other than the ones you tested. I noticed that we can directly set the property nodes to input the open/short/load compensation resistance/reactance...etc, but where are these values come from?

As you mentioned, the compensation document does not really talk about how to exact these values from on-board memory after compensation is conducted. The niDCPower Get Compensation Data.vi gives output of an array of unsigned 8bit integer, which is hard to interpret.

Can I assume that I can directly conduct measurements under open-circuit, short-circuit, and known load conditions and use the output impedance to calculate those values?

Thank you

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Hi,
i also assumed that and yes, that is what i did.
But i really doubt, if that is the correct approach here.... it would be much better, if the official documentation would be updated in that regard.

Have a nice day!