Vaisala Calibration of Digital Transmitters with HMI41 - Manual (Page 16)

User's Guide ______________________________________________________________________
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0605-012
Figure 4 Service Port in Series HMT330 Transmitters
After having connected the cable, turn HMI41 on with the ON/OFF
button and wait until the following text appears on the display:
RH
If you press the HOLD button, you will go on to two-point calibration
mode, and if you press the MODE button, you will go on to gain
calibration mode. You can return to offset calibration mode from two-
point or gain calibration modes by pressing MODE or HOLD
repeatedly. As offset and gain calibrations are performed in the same
way, the following chapter is valid for both. For two-point calibration,
see Two-Point Calibration on page 18.