Vaisala HMP155 - Manual (Page 62)

USER'S GUIDE____________________________________________________________________
60 _______________________________________________________________ M210912EN-C
7. Insert the probe into the high end reference chamber (for example,
NaCl: 75 % RH chamber in the humidity calibrator HMK15) and
do the high humidity gain adjustment by using the - and + buttons
to make sure the A
out
voltage is correct. To finish the RH
calibration, press the ADJ button and the red indicator LED lights
up.
NOTE If you do not wish to perform the temperature adjustment at this time,
press ADJ -button two times and the indicator LED turns off. After
reset, HMP155 exits the calibration mode. Otherwise, continue
following the instructions from step 8 onwards.
8. Insert the probe into a known reference temperature (if HMK15
Humidity Calibrator is not used) and let the temperature reading
stabilize.
NOTE Do not touch the adjustment buttons before the conditions have
stabilized.
9. Using the - and + buttons, make the temperature offset adjustment
by making sure the A
out
voltage is correct and press the ADJ
button. Red indicator LED turns off and back.
NOTE If you do not wish to perform the two-point temperature adjustment at
this time, press the ADJ button one more time so that the red indicator
LED turns off. After reset, HMP155 exits the calibration mode.
Otherwise, continue following the instructions from step 10 onwards.
10. Insert the probe into another reference temperature.
NOTE Do not touch the adjustment buttons before the conditions have
stabilized.
11. Using the - and + buttons, make the temperature gain adjustment
by making sure the A
out
voltage is correct.
12. Press the ADJ button and the red indicator LED turns off.