Vaisala HMP42 - Manual (Page 20)

HMI41 AND HMP42
Operating Manual
M210317EN-A
16
All selections are acknowledged with ENTER. In the following, you will find
a list of these calibration options.
RH
set
T Default calibration restores the factory settings of
the humidity and temperature calibrations.
RH
set
One point humidity calibration; select this for
performing humidity calibration at one point. See
Chapter 5.3.1 for further details.
RH
set
Two point humidity calibration; select this for
performing humidity calibration at two points.
See Chapter 5.3.2 for further details.
set
T
One point temperature calibration; select this for
performing temperature calibration at one point.
See Chapter 5.3.3 for further details.
set
T
Two point temperature calibration; select this for
performing temperature calibration at two points.
See Chapter 5.3.4 for further details.
5.3.1 One point humidity calibration
In one point humidity calibration, one accurate humidity reference is
sufficient. However, note that after one point calibration, the humidity reading
is most accurate near the reference value. For a better accuracy over the whole
range, perform a two point calibration if possible.
Leave the reference instrument (HMK15) and the probe at the calibration site
at least 30 minutes so that the probe temperature stabilizes to the room
temperature. Start the calibration by inserting the probe to the reference
humidity.
In setup mode, press ENTER repeatedly until the following is displayed:
set