Vaisala HMP260 - Manual (Page 71)

HMP260 SERIES
Appendix 1: Serial commands
HMP260-U017en-1.5
2 CALIBRATION COMMANDS
CRH Relative humidity calibration
Disconnect the security lock jumper!
CRH <cr>
With this command the transmitters can be calibrated against a reference. A one-point
calibration can be done against an accurate transfer standard in the field and a two-point
calibration using saturated salt solutions in controlled conditions. A two-point calibration
is performed as follows:
CRH <cr>
RH : 12.00 Ref1 ? 11.3 <cr>
Press any key when ready ...
RH : 76.00 Ref2 ? 75.5 <cr>
In one-point offset correction, the Ref2 prompt is acknowledged with <cr>:
CRH <cr>
RH : 12.80 Ref1 ? 11.3 <cr>
Press any key when ready ...
RH : 75.50 Ref2 ? <cr>
If the stabilization of the sensor to the humidity in the calibrator needs to be monitored,
the measurement output can be repeated by giving command c<cr> at Ref1 and Ref2:
CRH <cr>
RH : 12.00 Ref1 ? c <cr>
RH : 11.70 Ref1 ? c <cr>
RH : 11.50 Ref1 ? 11.3 <cr>
Press any key when ready ...
RH : 76.00 Ref2 ? 75.5 <cr>