Hi all,
I am having the (similar) drift issue but it's in different fashion. I have two strain gauges on my sample (one on the compression side and other on the Tension side). I am using two individual channels to measure two individual strains from each gauge and using quarter bridge connection with "dummmy" resistor.
When I use the gauge alone. The results are nice and steady; and am able to nullify the output at some point. But, as soon as I place (glue) the gauge on my sample the voltage started to drift again.
Assuming the possibility of the defective gauge, I tried using brand new gauge on my sample but the drift continued as soon as the sample comes in the picture. I also changed the sample with brand new gauges but couldn't get rid of the drift. Just to avoid any possible temperature affect, I changed the room where the room temperature was monitored, but the drift continued.
When, I interchanged the position of the gauges on the bridge I and II, the drift became negative and continued to -ve 5 volts in merely 10 mins.
As all these indicate the gauge on the sample may be the cause, I checked the resistance on the gauge (with sample) and it comes out to be 120 ohms as it should be.
Any hint what could be the trouble here.
Thanks in advance,
Tkp
I am having the (similar) drift issue but it's in different fashion. I have two strain gauges on my sample (one on the compression side and other on the Tension side). I am using two individual channels to measure two individual strains from each gauge and using quarter bridge connection with "dummmy" resistor.
When I use the gauge alone. The results are nice and steady; and am able to nullify the output at some point. But, as soon as I place (glue) the gauge on my sample the voltage started to drift again.
Assuming the possibility of the defective gauge, I tried using brand new gauge on my sample but the drift continued as soon as the sample comes in the picture. I also changed the sample with brand new gauges but couldn't get rid of the drift. Just to avoid any possible temperature affect, I changed the room where the room temperature was monitored, but the drift continued.
When, I interchanged the position of the gauges on the bridge I and II, the drift became negative and continued to -ve 5 volts in merely 10 mins.
As all these indicate the gauge on the sample may be the cause, I checked the resistance on the gauge (with sample) and it comes out to be 120 ohms as it should be.
Any hint what could be the trouble here.
Thanks in advance,
Tkp