Chapter 5, Calibration and adjustment – Vaisala PTB210 (serial) User Manual
Page 23
Chapter 5 ___________________________________________________Calibration and Adjustment
VAISALA _______________________________________________________________________ 21
CHAPTER 5
CALIBRATION AND ADJUSTMENT
The PTB210 series digital barometers can be fine adjusted and
calibrated against pressure standards that have high accuracy and
stability as well as known traceability to international standards. For
the Class A barometers, standards with uncertainty of
70 ppm (2
standard deviation value) or better should be used. For the Class B
barometers, electronic working standards with uncertainty of
150
ppm are recommended.
NOTE
Calibration is considered not to involve any adjustments.
The pressure readjustment of a PTB210 series digital barometer is
performed by deactivating first the multi-point corrections using
MPCOFF
command. All fine adjustments are then deactivated. By
comparing the output to a reference, the user can define the
corrections required for readjustment.
It is advisable to write down the previous multi-point corrections so
that they will not be lost by mistake.
The corrections are given by using the Wizard software; available for
download at
hen the new
multi-point corrections have been entered to the barometer, the
corrections are activated either with the Wizard or with the
MPCON
command. Finally, the barometer is calibrated to verify its real
accuracy.