Racal Instruments 1256 Manual page 40

Publication No. 980855 Rev. A
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7. Rotate the knob one more click to the right. Line 2 now
shows the contents of slot 3 (1260-120 plug-in):
----OPERATIONS----
>Slot 03: 1260-120 <
Channel: 0
Status: Open
8. Press the third keypad switch (corresponding to line 3 of the
display). This selects line 3 so that the relay channel can be
selected:
----OPERATIONS----
Slot 03: 1260-120
>Channel: 0
Status: Open
9. Rotate the knob to the right. As the knob rotates, the
channel number indicated by line 3 increments upward. Stop
when the channel number reaches 2:
----OPERATIONS----
Slot 03: 1260-120
>Channel: 2
Status: Open
1256 User Manual
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Using the Front-Panel Controls 3-5