Vaisala HMP240 User 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
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
Ta : 0.80
Ref1 ?
0.0
Press any key when ready ...
Ta : 56.20
Ref2 ?
55.0
In one-point offset correction, the Ref2 prompt is acknowledged with
>CTA
Ta : 0.80
Ref1 ?
0.0
Press any key when ready ...
Ta : 75.50
Ref2 ?
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
>CTA
Ta : 0.80
Ref1 ?
c
Ta : 0.40
Ref1 ?
0.00
Press any key when ready ...
Ta : 56.20
Ref2 ?
55.0
ACAL
Calibrating the analogue outputs
Disconnect the security lock jumper!
ACAL
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
Ch1
U1
(V ) ?
0.123
Ch1
U2
(V ) ?
9.98
Ch2
U1
(V ) ?
0.120
Ch2
U2
(V ) ?
9.98