We are using a datataker (Model: DT85 GM Series 4)in our lab to take strain gauges reading. We have another datataker (Model: DT85 GM Series 3) also in our lab in use. When we connected the same strain gauge to both datatakers separately, both showed different readings. The DT85 Series 4 showed it in the ‘6000-7000’ range and the DT85 Series 3 showed it in the ‘10000-11000’ range (Please refer to the images attached). Is this normal to have different readings from different datatakers for the same strain gauge connected to the same specimen (in our case, the strain gauge was connected to a steel specimen)? Or does this show any problem in datataker for reading values (The DT85 Series 3 had a connectivity issue for some time which was solved lately through a firmware update)?

Also, is there any way to set the initial readings of the datataker to ‘zero’ whenever we connect the strain gauges or displacement transducers to it?

Thanks in advance.

Hi SJRJ,

It is possible to have a different strain gauge reading when you move between the logger, especially when you use a simulated bridge. The norm of reading strain gauge needs you to re-zero the circuit when no strain is applied to the gauge before starting any reading.

But the difference of 4000 ppm is indeed unusual. Can you please explain your wiring, the sensor detail, and the syntax in your program?

Best regards,
Rudy Gunawan