Vaisala PTB330 - Manual (Page 117)

Chapter 6 ___________________________________________________Calibration and Adjustment
VAISALA ______________________________________________________________________ 115
After disabling the previous adjustments, calibrate the PTB330 against
your pressure reference. Make a note of the pressure reading of each
PTB330 barometer module separately (quantities P
1
, P
2
, and P
3
). Then
use the display/keypad to enter and activate the new multipoint/linear
adjustment factors:
1. Press the ADJ button located on the motherboard in the upper
corner on the left-hand side to open the ADJUST PTB330
menu.
2. Select P1 adjustments , press the right arrow button.
3. Select Multipoint/Linear adjustment, press the SET button.
4. Select an existing adjustment point or Add adjustment point
and press the SET button to enter your new values. If asked,
select MODIFY to replace the old values with your new ones.
5. Enter the P
1
value of the PTB330 at the Reading prompt using
the up/down arrow buttons. Press the OK button.
6. Enter the corresponding pressure reference value to the
Reference
prompt using the up/down arrow buttons. Press the
OK button.
7. Repeat steps 4…6 until you have entered all the pressure points
you have.
8. To remove any excess old adjustment points, press SET and
select REMOVE on each of them.
9. Once you have finished, press the OK button. Press the YES
button to activate the adjustment you have configured.
10. Press the left arrow button to go back to the ADJUST PTB330
menu and repeat steps 2…9 for each barometer module you are
adjusting.
11. If necessary, go to the Adjustment Information submenu and set
a new calibration date and note.
12. Exit the adjustment mode by pressing EXIT.