Aalborg PWE Digital - Manual (Page 61)

5.2.2 Flow 0-5 Vdc analog output calibration
1. Install jumpers J3A, J3B and J3C on the PC board for 0-5 Vdc output
(see Table 5-1).
2. Connect a certified high sensitivity multi meter set for the voltage
measurement to the pins M (+) and K (-) of the PWE 12 Pin "M16" connector.
3. Write 4000 counts to the DAC_A channel: !11,WRITE,0,4000[CR]
4. Read voltage with the meter and calculate FOutScaleV value:
5. Save FOutScaleV in to the EEPROM: !11,MW,39,X[CR]
Where: X – the calculated FoutScaleV value.
5.2.3 Flow 4-20 mA analog output calibration
1. Install jumpers J3A, J3B and J3C on the PC board for 4-20 mA output
output (see Table 5-1).
2. Connect a certified high sensitivity multi meter set for the current
measurement to pins M (+) and K (-) of the PWE 12 Pin "M16" connector.
3. Write 4000 counts to the DAC_A channel: !11,WRITE,0,4000[CR]
4. Read current with the meter and calculate FoutScale_mA value:
5. Write zero counts to the DAC_A channel: !11,WRITE,0,0CR]
6. Read offset current with the meter and calculate FoutOffset_mA value:
7. Save FoutScale_mA in to the EEPROM: !11,MW,41,Y[CR]
Save FoutOffset_mA in to the EEPROM: !11,MW,42,Z[CR]
Where: Y – the calculated FoutScale_mA value.
Z – the calculated FoutOffset_mA value.
56
FoutScaleV=
20000
Reading[V]
FoutScale_mA =
4000
Reading[mA]
FoutOffset_mA=-FOutScale_mA*Offset_Reading[mA]