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Entry  Wed Aug 10 14:27:39 2011, Ishwita , Manuel, Update, PEM, Calibration of Guralp and STS2 
    Reply  Wed Aug 10 14:35:39 2011, rana, Update, PEM, Calibration of Guralp and STS2 
       Reply  Wed Aug 10 15:17:39 2011, Ishwita, Manuel, Update, PEM, Calibration of Guralp and STS2 
          Reply  Thu Aug 11 09:39:25 2011, Ishwita, Manuel, Update, PEM, Calibration of Guralp and STS2 pw_gurs_aug11.png
             Reply  Thu Aug 11 11:50:56 2011, Manuel , Ishwita, Update, PEM, Calibration of Guralp and STS2 
                Reply  Thu Aug 11 16:15:59 2011, Ishwita, Manuel, Update, PEM, Calibration of Guralp and STS2 
Message ID: 5185     Entry time: Thu Aug 11 09:39:25 2011     In reply to: 5175     Reply to this: 5187
Author: Ishwita, Manuel 
Type: Update 
Category: PEM 
Subject: Calibration of Guralp and STS2 

Quote:

Quote:

I'm pretty sure that don't have any ADC's with this gain. It should be +/- 10V for 16 bits. 

Jenne told us that the ADC was +/- 2V for 16 bits so our calibration is wrong. Since, the ADC is +/- 10V for 16 bits we need to change our calibration and now we can also use the purple STS breakout box.

 New calibration for Guralp:

ADC: 216counts = 20V Hence, calibration of ADC is (215x0.1) counts/V.


GURALP

Sensitivity = 800 V/ms-1

(215 x 0.1) counts/V x 800  V/ms-1 = 2621440 counts/ms-1 ----->  3.8147e-07 ms-1/count

Calibration = 3.8147e-07 ms-1/count


Using the above calibration we obtain the following plot:

pw_gurs_aug11.png

When we compare this plot with the old plot (see here) we see that in our calibration, we have got a factor of 10 less than the old plot. We do not know the gain of the Guralp. If we assume this missing 10 factor to be the gain of Guralp then we can get the same calibration as the old plot. But is it correct to do so?

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