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Appendix B — Humilab chilled mirror hygrometer
• From Operate mode, press and hold
N
until “
O
” is displayed in
the
CONTROL STATUS
display. In addition, the parameter
annunciator will show “Humidity.”
Press
S
to View and/or Change the humidity output. The
CONTROL STATUS
display will show “
H
.” Press
S
to change the
humidity output units.
The
CONTROL STATUS
display will show “
O
.” The units portion
of the main display will show the units available for the out-
put you are changing. Press and hold
N
to scroll through the
units, and press
S
to select one.
The
CONTROL STATUS
display will now show “
H
,” and the cur-
rent high value will now appear on the main display. Press
S
to change this value. The right-most digit will blink.
Press
N
and hold to scroll through the digits and press
S
to
select one. The second digit from the right will blink.
Continue as before. Finally the sign for the value will blink.
The choices here are –, –1, 1, or “blank.” Note that the 1 is a
half-digit and that + is not shown.
Once the sign is set, press
S
to continue through the output
changing sequence.
• You will now be given the opportunity to view and/or change
the low humidity output value. Note that you cannot change
the output units by accessing the low output value. This can
be done only by accessing the high output, as described
above. If you want to change the low output value, press
S
and proceed as above.
• You will then have an opportunity to view and/or change the
Temperature. Proceed as above.
RS-232c re-programming mode
See Appendix C for information on establishing RS-232 communi-
cations. Once you have established communications, follow the
menu descriptions here.
RS-232C re-programming is done via a series of menus and oper-
ates on firmware in the Humilab chilled mirror system. To access
