ADLINK ACL-6128A - Manual (Page 38)

30 • Calibration
5.5 Bipolar Output Calibration
If Bipolar mode for analog output is used, use Bipolar Output Calibration to
correctly calibrate. There are two steps involved: Gain Calibration and Offset
Calibration.
Gain Calibration:
1. Set jumpers JP1 and JP5 (for CH1) or JP2 and JP9 (for CH2) as
bipolar, and choose an internal reference as -5V.
2. Set the digital data as (1000 0000 0000)
B
, trim VR4 (for CH1) or VR10
(for CH2) until the voltmeter reading is 0V.
Offset Calibration:
1. Set the internal reference to -5V.
2. Set the digital data as (0000 0000 0000)
B
, trim VR6 (for CH1) or VR12
(for CH2) until the voltmeter reading is -5V.
5.6 Current Sink Calibration
If using current sink output, please do the following:
Use -5V for internal reference and its reference voltage.
Follow the below procedures to calibrate the current sink output.
1. Set the digital data as (0000 0000 0000) B , and internal reference as -
5V, using unipolar output range.
2. Trim VR5 (for CH1) or VR11 (for CH2) until there is a constant current
of 4mA.