
Chapter 6 ___________________________________________________Calibration and adjustment
VAISALA ______________________________________________________________________ 137
Analog Output Adjustment (Ch1 and Ch2)
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 PTU300 to a calibrated current/voltage meter in order to
measure either current or voltage depending on the selected output
type.
NOTE
Normally, analog output Ch3 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
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 1/2, press
the START key.
4. Measure the first analog output value with a multimeter. Give
the measured value by using the arrow keys. Press the OK key.
5. Measure the second analog output value with a multimeter. Give
the measured value by using the arrow keys. Press the OK key.
6. Press the OK key to return to the adjustment menu.
7. Press the EXIT key to close the adjustment mode and to return
to the basic display.
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