Offset and gain adjustments, Hmi41 as a reference meter – Vaisala HMT100 User Manual
Page 36
User's Guide ______________________________________________________________________
36 __________________________________________________________________ M210701EN-D
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 HMT100 motherboard (see Figure 9 on
5.
Connect the other end of the connection cable to the
EXT
connector located on the bottom of the HMI41 indicator (see
Figure 17 on page 34).
6.
Turn on both devices. Wait until the following display appears:
RH
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:
RH
or
RH
Press
ENTER
to confirm the selection. A display similar to the
following appears:
RH
%
The next sections describe how to perform offset and gain adjustments in
two different ways.
HMI41 as a Reference Meter
The HMI41 humidity probe is used to show the correct humidity value
(be sure that the reference probe has previously been adjusted). Connect
the cable and select the appropriate adjustment method as previously
explained, and continue according to the following instructions.
8.
A display similar to the one below should be visible:
RH
%
Numbers on the first line indicate the transmitter reading, and
the numbers on the second line indicate the reference probe
reading.