Aalborg SDPROCs - Manual (Page 39)

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The display should show the D/A value between 3900 and 4095. Save the D/A slope
parameter by pressing the CAL (ENTER button).Proceed with D/A calibration for as
many channels as required. When digital to analog (D/A) slope is calibrated for last
available channel, the following display will appear.
g.2 Analog to Digital (A/D) Calibration
Select the A/D calibration mode from the Calibration Menu. The following display will
appear.
Connect exactly 5.000 VDC to pin 3 for all available channels on the 15 pin “D” connectors
and ground to pin 10.
NOTE: Make sure the inputs from all available channels (pin 3 on the 15 pin “D”
connector) are connected to a stable source of the voltage 5.000 Vdc (failure to
do so, will result in incorrect SCALE calibration for channels which are not
connected to 5.000 Vdc).
Press any key when done with 5.000 Vdc connections. The following display will appear.
NOTE: The screen above assumes four channels SDPROC. The number of SCALE read-
ings on the screen will correspond to the number of channels for the SDPROC being
calibrated. The display should show the A/D scale values between 150 and 250. If any
value is outside of those limits, the PC board is defective. Save the A/D scale parame-
ters by pressing the CAL (ENTER button). The following display will appear.
Connect pin 3 for all available channels on the 15 pin “D” connectors to the ground (pin 10).
NOTE: Make sure the inputs from all available channels (pin 3 on the 15 pin “D”
connector) are connected to the common pin 10 (failure to do so, will cause
incorrect OFFSET calibration for channels which are not connected to ground).
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