7-8
VL-1225/6 Analog Input/Output Board
Output Calibration (VL-1225 only)
• Disconnect all inputs and outputs from the card and connect the voltmeter to channel 0.
• Referring to the table below, select the column which matches the output range and data format
of the channel being calibrated.
• Write the “ZERO” data to the output channel as indicated in the table. This causes the largest
negative voltage to be output.
• Adjust the ZERO pot (Z0 for channel 0, Z1 for channel 1) until the “ZERO” output reading, as
indicated in the table, shows on the voltmeter.
• Write the “GAIN” data to the output channel. This causes the largest positive voltage to be
output.
• Adjust the GAIN pot (G0 for channel 0, G1 for channel 1) until the “GAIN” output reading, as
indicated in the table, shows on the voltmeter.
• Repeat the above steps for channel 1.
————————————— Output Range ——————————————
±5V
±5V
±10V
±10V
0 to 10V
Offset
Two’s
Offset
Two’s
Natural
Binary
Complement
Binary
Complement
Binary
“ZERO”
Data
00H
80H
00H
80H
00H
Output
–5.000V
–5.000V
–10.000V
–10.000V
0.000V
“GAIN”
Data
FFH
7FH
FFH
7FH
FFH
Output
+4.961V
+4.961V
+9.922V
+9.922V
+9.961V
Figure 7-8. Calibration Codes
External Connections
J1 is an unlatched 34-pin dual-row (.1" center) header type connector. External connections to the VL-
1225/6 can be made with standard cable assemblies, or with the following mating connectors:
Mating Connectors
Connector
Mating Connector
J1
26-pin socket type connectors such as 3M #3399-7026,
Ansley 609-3441, or Robinson Nugent FDSC34PK-SR-TG
Figure 7-9. Mating Connectors
Reference – External Connections
