2-22 Close/Open Switching Module Channels Model 2701 User’s Manual
Multiple channel operation anomalies
• Anomaly #1 — When you use multiple channel operation to open the system
channel, the channel will open but the system channel number will still be
displayed on the Model 2701. For details, see “Anomaly #1 example — wrong
channel displayed.”
• Anomaly #2 — For a 4-wire function, you can use multiple channel operation to
open the paired channel. If you then use system channel operation to again select
the already closed system channel it will not re-close the paired channel. For
details, see “Anomaly #2 example — opening the paired channel.”
NOTE The following anomaly examples assume a Model 7700 installed in slot 1.
Anomaly #1 example — wrong channel displayed
The following example closes channel 102 and connects it to the DMM Input. However,
the Model 2701 will not display the measurement channel that is closed. It will display
channel 101 instead of channel 102.
1. Use the ALL option for the OPEN key to open all channels in the mainframe.
Remote programming: ROUT:OPEN:ALL
2. Press the key to close (and display) channel 101. This closes channel 101 (which
is the system channel) and channel 125 to connect it to the DMM Input
(Figure 2-1).
Remote programming: ROUT:CLOS (@101)
3. Use the MULTI option for the CLOSE key to close channel 102. The system chan-
nel is not affected. Channels 101, 102, and 125 are now closed.
Remote programming: ROUT:MULT:CLOS (@102)
4. Use the MULTI option for the OPEN key, open channel 101. Even though channel
101 is still being displayed on the Model 2701, it is channel 102 that is actually
connected to the DMM Input (channels 102 and 125 closed).
Remote programming: ROUT:MULT:OPEN (@101)
To correctly display the channel that is closed (channel 102), repeat step 1 above to open
all channels and then use the key or the ROUT:CLOS (@102) command to close (and
display) channel 102. This closes channel 102 (which is the system channel) and channel
125 to connect it to the DMM Input.
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