Vaisala HMP240 - Manual (Page 77)

HMP240
M210300en Appendix 1: Serial commands
75
CTA Temperature calibration of the optional T sensor head
Disconnect the security lock jumper!
CTA <cr>
With this command the optional temperature sensor head can be calibrated
against an accurate reference, such as a Pt 100 simulator. A two-point
calibration is performed as follows:
>CTA <cr>
Ta : 0.80
Ref1 ? 0.0 <cr>
Press any key when ready ...
Ta : 56.20
Ref2 ? 55.0 <cr>
In one-point offset correction, the Ref2 prompt is acknowledged with <cr>:
>CTA <cr>
Ta : 0.80
Ref1 ? 0.0 <cr>
Press any key when ready ...
Ta : 75.50
Ref2 ? <cr>
If the stabilization of the sensor to the temperature of the calibrator or the ref-
erence needs to be monitored, the measurement output can be repeated by giv-
ing command c<cr> at Ref1 and Ref2:
>CTA <cr>
Ta : 0.80
Ref1 ? c <cr>
Ta : 0.40 Ref1 ? 0.00 <cr>
Press any key when ready ...
Ta : 56.20
Ref2 ? 55.0 <cr>
ACAL Calibrating the analogue outputs
Disconnect the security lock jumper!
ACAL <cr>
Calibrates the outputs selected on channels 1 and 2. The output is measured
and the measured values (mA or V) entered as calibration coefficients.
For example, calibrating the outputs when 0...10 V signal has been selected on
both channels (set with AMODE command)
>ACAL <cr>
Ch1
U1 (V ) ? 0.123 <cr>
Ch1 U2 (V ) ? 9.98 <cr>
Ch2 U1 (V ) ? 0.120 <cr>
Ch2 U2 (V ) ? 9.98 <cr>