Offset and gain adjustments – Vaisala HMT120 User Manual
Page 63
Chapter 5 _______________________________________________________________ Maintenance
VAISALA ________________________________________________________________________ 61
Offset and Gain Adjustments
Offset and gain adjustments are performed in the same way (they differ
only in internal calculations), so this section is valid for both methods.
4.
Connect the 25917ZZ HMI41-connection cable to the
SERVICE PORT
connector on the HMT120 motherboard (see Figure 11 on page
5.
Connect the other end of the connection cable to the
EXT
connector
located on the bottom of the HMI41 indicator (see Figure 20 on
page 59).
6.
Turn on both devices. Wait until the following display appears:
7.
Select the appropriate adjustment mode with the ▲ and ▼ buttons.
Select offset adjustment if the humidity is < 65 %RH and gain
adjustment if the humidity is ≥ 65 %RH:
or
Press
ENTER
to confirm the selection. A display similar to the
following appears:
NOTE
In case of using a HMT120 transmitter with display option, the text
"HMI41 adjustment mode" is shown at the upper row of HMT120
display.
The next sections describe how to perform offset and gain adjustments in
two different ways.
RH
RH
RH
RH
%