Vaisala MMT330 - Manual (Page 147)

Chapter 7 ___________________________________________________ Calibration and Adjustment
VAISALA _______________________________________________________________________ 147
Temperature Adjustment
Using Display/Keypad
1. Press the ADJ button on the motherboard to open the
ADJUSTMENT MENU. If using a warmed probe for measuring,
probe heating will be interrupted when ADJ key is pressed. Wait
some time for the probe to reach ambient temperature.
2.
Select ►Adjust T measurement, press ►key.
3. Select 1-point/ 2-point adjustment, press START.
4. Remove the filter from the probe and insert the probe into the
reference temperature.
5. Wait at least 30 minutes for the sensor to stabilize. Follow the
stabilization from the GRAPH display.
6. Press READY when stabilized. Give the reference temperature
using the arrow keys.
When carrying out the 2-point adjustment, proceed to the next
adjustment point and carry out the procedure as described in the
previous item. Note that the difference between the two
temperature references must be at least 30 ºC.
7. Press OK. Press YES to confirm the adjustment.
8. Press OK to return to the adjustment menu.
9. Press EXIT to close the adjustment mode and return to the basic
display.
Using Serial Line
1. Press the ADJ key on the motherboard to open the adjustment
mode.
2. Remove the probe filter and insert the probe into the reference
temperature.
3. Enter the command CT and press ENTER.
4. Type C and press ENTER a few times to check if the reading is
stabilized. Let the reading stabilize, give the reference temperature
after the question mark and press ENTER three times.
When having another reference temperature (2-point calibration)
press ENTER only twice and insert the probe to the second
reference. When the reading is stabilized, give the second reference
temperature after the question mark and press ENTER. Note that
the difference between the two temperature references must be at
least 30 ºC.