Current probe measurments with LabView

[LilySamchuk]

Hello. I am trying to measure current and voltage with LabVIEW and PXI set up. I am using current probe to measure current but the values that I got are larger compare to real values that I can see when using current probe with oscilloscope. The voltage is measured correctly. Any idea what may be the reason for this?

The probe attenuation is set correctly.

[santo_13]

Depends on a lot of factors, unless you share all involved HW details and how you're measuring (code that you use), we could only speculate that the user is not using the right settings or the right set of HW

[LilySamchuk]

NI scope VI is used with attenuation 10, vertical range 10 and offset 0 - in initialize block. 

In main I am suing niScope Multi Fetch WDT and get waveform components to write the data into csv file. 

[santo_13]

What does the resolution and accuracy of the scople translate into for a current measurement for the given settings?

How are you comparing the scope measurement to an actual one (like a DMM or something)?

[LilySamchuk]

I have one current probe connected to the oscilloscope and the second one to PXI (where data is recorded and then graph is build ) and compared  to the oscilloscope one. 

[santo_13]

Unfortunately, you have not been very explicit in the HW you are using.

What is the accuracy of current measurement of your non-PXI scope?

[JÞB]

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@LilySamchuk wrote:

Hello. I am trying to measure current and voltage with LabVIEW and PXI set up. I am using current probe to measure current but the values that I got are larger compare to real values that I can see when using current probe with oscilloscope. The voltage is measured correctly. Any idea what may be the reason for this?

The probe attenuation is set correctly.

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"Larger" is very ambiguous.  So is "Real."  "Current Probe" and "PXI Setup" can mean any one of several sets of hardware.

• What current probe are you using?
• What O'Scope?
• What PXI device?
• What are the readings you are comparing?  Do they differ by %0.001, %10, 3dB, 10dB?
• What is the expected value?