Vaisala HMW90 - Manual (Page 61)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 59
1-point Adjustment of RH Measurement
The 1-point adjustment adjusts both offset and gain depending on the
adjustment condition. The same type of adjustment is done when turning
the RH trimmer.
Place the transmitter in the reference condition and allow it to stabilize
before entering the adjustment.
CRH [ONE] [x]<cr>
where
x = The reference humidity condition (%RH) that the transmitter
should be showing.
Example:
>pass 9000
>crh one 11
OK
2-point Adjustment of RH Measurement
CRH [LO | HI] [x]<cr>
where
LO = Adjustment point at the dry end (low RH).
HI = Adjustment point at the wet end (high RH). The difference
between the two points should be at least 30 %RH.
x = The reference humidity condition (%RH) that the transmitter
should be showing.
The 2-point correction is not applied immediately – you must use the
CRH SAVE command to store your adjustment to the HTM10 module.
If you have entered user adjustments using the CRH command but do not
wish to commit them, use the CRH CANCEL command.
CRH [SAVE | CANCEL]<cr>
Example (two point adjustment, low point 11 %RH and high point 75
%RH):
>pass 9000
>crh lo 11
OK
>crh hi 75
OK
>crh save
OK