'Bridge shun cal.vi' shunted value setting?

[usuario]

I've copied the 'bridge shun cal.vi' from the LabView example 'Acq Wheastone Bridge Samples (with Calibration).vi', to include it in a strain measuring .vi I'm working on.

My hardware consists on a SCXI 1001 chassis, 1520 and 1314 modules.

What does de 'Shunted value' setting stand for? Shunting resistance's value (in ohms, I supouse)?

And this is less important for me, but think it can be interesting for others: How do I make it to choose between shunt calibration resistance A or B?

Thanks,

usuario

[DavidOna · Accepted solution]

Hi usuario,

     You're right when you say 'shunt resistor' in 'DAQmx Perform Shunt Calibration (Bridge)' VI stands for the value of shunt resistor in ohm. As you can see in page 4 of the SCXI-1314 manual, both shunt calibration resistors A and B are have a value of 100 kohm. Besides, page 4-28 of SCXI-1520 User Manual specifies they are are RN-55 style (standard 1/4 W).

     Respect choosing whether shunt calibration resistor A or B, this last manual mentions in page 3-4 that 'shunt calibration switches A and B are software control settings that allow ou to engage or disengage the shunt calibration resistors in order to erform gain calibration. In most cases, you do not explicitly control he shunt calibration switches, but instead allow driver software to utomatically adjust them for you during the automated shunt calibration procedure. However, if you want to explicitly control the calibration witches, you can write an application program that controls the shunt alibration switches.' and refers user  to Chapter 4, Theory of Operation, for more Information.

     Hope this helps.

     Regards,

[usuario]

Gracias David, si tienes ñ de Oña supongo que entenderás esto.

Por cierto, si pudieras echarle un ojo a esto también te lo agradecería:

http://forums.ni.com/ni/board/message?board.id=170&message.id=380356#M380356

Gracias,

usuario