enabling shunt calibration for ch0 on SCXI-1121

[cpc13]

Hi, I'm going through the "Stress and Stain" NI lab manual and I came to intruction #4 (Configure the SCXI 1121) part (a) Enable shunt calibration for channel 0.

I'm confused as to how to enable the shunt calibration. The SCXI-1121 manual mentions setting SCAL to a value of 1. Is that what I'm suppose to do for this lab? If it is then how do I do that?? Could someone please provide some more detailed instructions? Is this done via software? hardware? MAX?

Thanks,
cpc13

[e-Cash-Money]

Hello cpc13,

I believe SCAL is a register value that needs to be set to turn on the shunt calibration. There is an example VI that implements this feature linked here:
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=BAF6461F2DB10223E034080020E74861

Here is another example that shows how to use the channel string (the example is for an 1122 but I think it should still be similar for the 1121):
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3E2F556A4E034080020E74861&p_node=DZ52452&p_source=External

Take care,
E.Lee

[cpc13]

Hi E.Lee thanks for replying. I'm currently looking into the NI-DAQ function SCXI_Calibration_Setup located in nidaq32.dll, which the program from the first link you posted makes reference to using a Call Library Function Node.

What's still confusing me is the fact that this instruction (4a) is listed before the instructions on jumper setting changes (4b) and before installation of the SCXI-1121 module into the SCXI-1000 Chassis (4c). It suggests that this is some kind of hardware setting that I'm suppose to modify physically.

This doesn't have anything to do with the Null Circuit jumper settings right?

[e-Cash-Money]

Hello cpc13,

I took a look at the Stress and Strain document and it looks like step 4b) is a jumper for gain settings, which you are correct, has nothing to do with Null Circuit settings. You can't access the jumpers in the 1121 after it is installed in the chassis, so that is why 4b) is listed first. I do agree with you that it is a little odd that step 4a) is there considering that it is done in software.

Take care,
E.Lee