Vaisala Calibration of Digital Transmitters with HMI41 - Manual (Page 20)

User's Guide ______________________________________________________________________
18 __________________________________________________________________ M210777EN-B
In this case, perform the calibration again. Whether the calibration
was successful or not, HMI41 always returns to show the selected
calibration mode:
RH
or
RH
After having successfully completed the calibration, turn HMI41 off
and disconnect the cable.
Two-Point Calibration
In two-point calibration mode, both offset and gain corrections are
made. This calibration mode is more accurate than offset or gain
calibrations. For performing a two-point calibration you need two
reference points with a difference of at least 50 %RH between them.
NOTE Two-point calibration is not supported for HMT100.
Select two-point calibration with buttons ▲ and ▼:
RH
Press ENTER and the following text appears on the display for about
1 ... 2 seconds:
RH