MSB780(X) - User’s Guide
5 Calibration and Adjustment
MSB780 or MSB780X is fully adjusted, compensated and calibrated in factory using a reference
traceable to the national standard according to ISO17025.
User of MSB780 or MSB780X is responsible for calibration of the barometer in appropriate
interval, or when there is a reason to believe, that the MSB780 or the MSB780X is not performing
within acceptable limits. If calibration results show impermissible measurement error, the error
can be removed using adjustment commands via serial interface.
Adjusting MSB780 or MSB780X is done by altering the k and q coefficients in the memory. This
is done by the command "cset", as discussed in section 6.36 on page 49.
MSB780X with more than one pressure transducer has a set of k and q coefficients for each
transducer.
The output pressure is computed using formula 1.
p
out
= k.p
meas
+ q (1)
where:
p
meas
is pressure measured by pressure sensor in hPa
k is the corrected pressure gain
q is the corrected pressure offset
p
out
is pressure on the output of the MSB780 in hPa
Note: Entering new adjustment coefficients overrides their previous values. It is advisable to
write down the previous coefficient values, so they are not lost by mistake.
5.1 How to read the current correction values
To get the current correction coefficients values, use the cnf?<cr> command, as described in
section 6.5 on page 34.
5.2 Disabling the correction
It is not possible to turn off correction, MSB780 or MSB780X always uses it to compute the
output value. It is however possible to virtually disable the correction by setting the coefficients
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