Vaisala HMW90 - Manual (Page 72)

User's Guide _______________________________________________________________________
70 ___________________________________________________________________ M211399EN-F
Adjustment Using an HM70
1. Connect the HMW90 series transmitter to the HM70 hand-held
meter using the connection cable (Vaisala order code 219980).
2. Depending on the connected devices, you may be prompted by the
HM70 meter to check the currently applied environment settings.
Check the settings when prompted.
3. In the Functions menu of the HM70, select Calibrate XMW9x
and press Start.
4. Confirm Yes. Confirm the automatic power off notification with
Ok.
5. Select parameter for adjustment, T or RH.
6. Screen shows the measured values and their difference. Press
Adjust to select the Adjustment mode.
7. Select the desired adjustment type using arrow buttons and press
Select:
- To same as reference: Adjusts the measurement of the HMW90
transmitter to the same reading as the reference that is connected
to the other port. When the parameter being adjusted is RH, both
offset and gain are adjusted, depending on the adjustment
condition (same as when turning the RH trimmer). This option is
not available if no reference is connected to the HM70.
- 1-point adjustment: Adjusts the measurement of the HMW90
to a reference value that you specify. When the parameter being
adjusted is RH, both offset and gain are adjusted, depending on
the adjustment condition (same as when turning the RH
trimmer). Follow the instructions from the HM70 when using
this option.
- 2-point adjustment: Adjusts the measurement of the HMW90
at two points to reference values that you specify. This option is
not available when adjusting temperature (T).
- Revert factory calib.: This option removes the currently
applied user adjustment from the HTM10 module. Only the
adjustment for the selected parameter is removed (RH or T).
8. Complete the selected adjustment by following the instructions
from the HM70.