Analog output adjustment (ch1 and ch2), Using display/keypad, Using serial line – Vaisala PTU300 User Manual
Page 179: Acal
Chapter 7 ____________________________________________________ Calibration and adjustment
VAISALA _______________________________________________________________________ 177
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 button.
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 buttons. Press the OK key.
5.
Measure the second analog output value with a multimeter. Give
the measured value by using the arrow buttons. 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.
Using Serial Line
Enter the ACAL command and type the multimeter reading for each
case. Continue by pressing ENTER.
ACAL
Example (current outputs):
>acal
Ch1
I1
(mA) ?
2.046
Ch1
I2
(mA) ?
18.087
Ch2
I1
(mA) ?
2.036
Ch2
I2
(mA) ?
18.071
>