Aalborg Vortex Insertion Uživatelský manuál stáhnout pdf (Strana 72)

6.1.3 Analog 4-20 mA channel#2 output calibration

1. Connect a certified high sensitivity multi meter set for the current

measurement to pins 3 (+) and 4 (-) of the TB3 terminal connector.

2. Write 4000 counts to the DAC2 channel: !11,WRITE,1,4000[CR]

3. Read current with the meter and designate it to Reading_4000_mA variable.

4. Write 400 counts to the DAC1 channel: !11,WRITE,1,400CR]

5. Read current with the meter and designate it to Reading_400_mA variable.

6. Calculate Out2_Scale_mA value:

Out2_Scale_mA = 3600 / (Reading_4000_mA - Reading_400_mA)

7. Calculate Out2_Offset_mA value:

Out2_Offset_mA = - (Reading_4000_mA/10 - Reading_400_mA) X Out2_Scale_mA

8. Save Out2_Scale_mA in to the EEPROM: !11,MW,34,Y[CR]

Save Out2_Offset_mA in to the EEPROM: !11,MW,35,Z[CR]

Where: Y – the calculated Out2_Scale_mA value.

Z – the calculated Out2_Offset_mA value.

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Aalborg Vortex Insertion Uživatelský manuál Strana 72