Vaisala HM40 User Manual
Page 38
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37
3.
Select the number of calibration
points at menu item [2] Points.
You can perform a 1-point or 2-
point calibration.
For 2-point calibration, you need
two reference environments. For
example, LiCl and NaCl salt
chambers provide 11% and 75%
relative humidity references.
4.
Remove the filter from the probe
and place the probe in the first
reference environment (first
calibration point).
Take care not to damage the
sensors. Wait 20 – 40 minutes for
the reading to stabilize.
5.
Select menu item [3] Point 1 and
press the Set button. The meter
now shows the currently
measured value of the selected
parameter. Set the reference value
using the arrow buttons and press
the OK button.
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