Hi All,

I am working in a project where we are using the DT 80 series 3 with strain gauge application. The resistance according the supplier is 350.4 Ohms ...Bridge connection has been done with DT 80 as per the drawing...Web interface has been established B/W laptop and DT 80 for configuration....Basic configuration have been done and this i configured as BGI (current excitation and arm resistance also defined)...

When i check in the monitor tab i am getting value between 90 to 100 PPM.....I have doubt the value which showing now is correct or wrong...If correct ,how can i able to make the zero (like offset) ....how can i cross check the PPM value ...

Thanks in advance

Good afternoon flsarun,

That is a very good result. All gauges will have some strain from installation but this isn't a problem as strain gauges are a relative output device.

To remove the offset just subtract the strain gauge reading when you are at the zero point. This can be done in a schedule that is triggered to take the zero reading or by hard coding.

Cheers

Roger

Good afternoon Roger,

First of all thanks for your prompt reply.As i am new for this data taker ,as said by you i have done calculation to subtract value but this zero is showing in the calculation window....is it possible to show in current bridge tab for example ..

Current bridge value ---100PPM

Calculation = current bridge- 100=0

How can i show zero in the current bridge instead of 100PPM.....

If you provide me some example it will be more useful for me...

BR/ARUN

Hi Arun,

Please find the following sample for re-zeroing:

BEGIN"Current"

1BGI(LM,=1CV,W) 'zero reference

RA5S LOGONA
1BGI(LM,=2CV,W) 'raw reading
3CV("Load~kN")=2CV-1CV 'real value
END

You need to read the initial value using BGI channel outside schedule A. This initial value will be used as a subs-tractor to raw reading value (BGI channel inside schedule A) to get the real value.

Best regards,
Rudy Gunawan