Vaisala HMW90 - Manual (Page 60)

User's Guide _______________________________________________________________________
58 ___________________________________________________________________ M211399EN-F
Calibration and Adjustment Commands
The following sections describe the calibration and adjustment
commands of the HMW90 series. For general information on performing
calibration and adjustment on the serial line, see section Adjustment
Using a PC on page 71.
The 1-point humidity adjustment of the HMW90 series adjusts both
offset and gain, depending on the adjustment condition. In a dry
condition (for example, 11 %RH), offset is adjusted more than gain.
NOTE The 1-point humidity adjustment requires that the target condition is at
least 50% of the currently measured value. This prevents the user from
making excessive corrections that are very unlikely to be needed.
However, if you feel that you may have done an incorrect adjustment,
you can easily remove the adjustment using the CRH RESET command.
Adjust Humidity Measurement
Use the CRH command to perform a humidity adjustment of the relative
humidity (RH) measurement. You can do a 1-point or a 2-point
adjustment, or clear the adjustment information from the HTM10
module. Note that the factory adjustment will remain intact when user
adjustment is cleared.
NOTE The CRH command does nothing on the TMW92 and TMW93
transmitters.
Show Current RH Adjustment
CRH<cr>
Example (showing default offset and gain):
>pass 9000
>crh
RH Gain : 1.000
RH Offset : 0.000