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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 http://www.vaisala.com/PTB210Wizard/. When 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.

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Vaisala PTB210 SERIES Guida Utente Pagina 23