Vaisala HMP228 User Manual
Page 57
HMP228 Transmitters
M210282en-A
Appendix 1: Serial commands
51
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 ) ?
9.980 <cr>
Ch2
U1
(V ) ?
0.120 <cr>
Ch2
U2
(V ) ?
9.980 <cr>
L
Outputting linear correction coefficients
L <cr>
With the help of command L the user can check how the transmitter has been
adjusted after it has been calibrated at the factory.
>L <cr>
RH
offset
: 0.000
RH
gain
: 1.000
Tsoffset
: 0.000
Ts
gain
: 1.000
LI
Entering linear correction coefficients
Disconnect the security lock jumper!
LI <cr>
The LI command is one way of calibrating the transmitters.
>LI <cr>
RH
offset
: 0.000 ? -.6 <cr>
RH
gain
: 1.000 ? <cr>
Ts
offset
: 0.000 ? <cr>
Ts
gain
: 1.000 ? .4 <cr>
The factory settings are offset 0 and gain 1. The transmitter can be returned to
its factory calibration by giving these values.