Heating problems Strain Gage; Wait for the function measurement of delay

Hello

I am able (using four 350 ohm gauges) of the strain using a NI 9237 module with a cDAQ in connection Full deck Type 3. My test is to measure the strain over long periods of time (~ 10 days). The NI 9237 measure strain at a rate of 2000 Hz (this is the slowest rate). The wheatstone bridge is currently powerd with the NI 9237 of 2.5 V. When I get my data permanently, I see the strain increases with time (which it shouldn't do my test), and I suspect it's because of free heating strain gauges. So, to overcome this problem, I think using "Wait (ms)" and ask the program to obtain data once every 5 min. Five minutes should be more than enough to dissipate any overheating of the gauge.

My question is: if I use the function 'wait (ms)', is my sensor (extensometer) are constantly under tension during the time-out of 5 minutes? I think that the functions "queue" are used inside a loop to allow a VI to sleep during the prescribed period (correct me if I'm wrong). So, it means that the sensor is not powered during this time?

Thank you

SID

I wouldn't use "wait" function for your timing... software you can use the time elapsed or other timing functions

Tags: NI Software

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