Vaisala PTU300 - Manual (Page 178)

User's Guide _______________________________________________________________________
176 __________________________________________________________________ M210796EN-G
Using Serial Line
1. Press the ADJ button on the motherboard to open the adjustment
mode. If using a warmed probe for measuring, probe heating will
be interrupted when ADJ button is pressed. Wait some time for the
probe to reach ambient temperature.
2. Remove the probe filter and insert the probe into the reference
temperature.
3. Enter the command CT or (CTA for additional T probe) 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.
Example (1-point adjustment):
>ct
T : 16.06 Ref1 ? c
T : 16.06 Ref1 ? c
T : 16.06 Ref1 ? c
T : 16.06 Ref1 ? c
T : 16.06 Ref1 ? c
T : 16.06 Ref1 ? 16.0
Press any key when ready ...
T : 16.06 Ref2 ?
OK
>
5. OK indicates that the calibration has succeeded. Give the
calibration information (date and text) to the transmitter's memory;
see the serial commands CTEXT and CDATE.
6. Press the ADJ button on the motherboard to close the adjustment
mode.
7. Take the probe out of the reference conditions and replace the
filter.