Vaisala PTB330 - Manual (Page 123)

Chapter 6 ___________________________________________________Calibration and Adjustment
VAISALA ______________________________________________________________________ 121
Analog Output Adjustment (Ch1)
In the analog output calibration the analog output is forced to the
following values:
- Current output: 2 mA and 18 mA.
- Voltage output: 10 % and 90 % of the range.
Connect PTB330 to a calibrated current/voltage meter in order to
measure either current or voltage depending on the selected output
type.
NOTE Normally, analog output module does not need to be adjusted once it
has left from the factory. However, if accuracy of the unit is
suspected, it is advisable to return the unit to Vaisala for re-
adjustment/calibration.
Using Display/Keypad
To adjust the analog output:
1. Press the ADJ button to open the ADJUSTMENT MENU.
2. Select Adjust analog outputs , press the right arrow key.
3. Select the output to be adjusted Adjust analog output 1, press
the START button.
4. Measure the first analog output value with a multimeter. Give
the measured value by using the arrow buttons. Press the OK
button.
5. Measure the second analog output value with a multimeter. Give
the measured value by using the arrow buttons. Press the OK
button.
6. Press the OK button to return to the adjustment menu.
7. Press the EXIT button to close the adjustment mode and to
return to the basic display.