How to shunt cal a load cell using SCXI 1520 and Signal Express

[OKors]

I've searched the boards but still cannot find a thorough solution for my question.

How do I condition and shunt cal a load cell using SigEx?

When we check out a load cell from our calibration lab it comes with a shunt "value" for a range of resistances (50k, 100k, 200K ohm is typical). The load cell I'm working with is a 100kip load cell which has a value of 61359lbs @ 100k ohm.

With our other signal conditioners, with the shunt applied we adjust the voltage gain until the output reads whatever the shunt value is (in my case it's 61359lbs).

[EEsRULEtheWORLD]

Hi, OKors.

When you create a DAQmx Strain Task, you can navigate to the Configuration tab » Device tab and select the Calibration button; here, you can perform shunt calibration.  To condition your load cell, you can create a Custom Scale to perform any conversion from the prescaled units measured by a channel to the scaled units associated with your measurement and then apply it to the Task (using the drop-down menu Custom Scaling on the Configuration tab).  Refer to page 121 of the SCXI-1520 manual for more information regarding calibrating.

I hope you're having a great day!

[OKors]

Right, but when I use the Strain Task setup it want's to know the gage factor, which for these load cells we do not have. We calibrate all our load cells in-house, so as I mentioned all we get back from the cal lab is a sticker which gives an output value in force (lbs) when 100k shunt is applied.

[RT4CY]

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