Model 2790 SourceMeter
®
Switch System User’s Manual 3-9
Opening and closing 7702 channels
Normally, system channel operation is used to control 7702 input channels.
NOTE It is not recommended, but multiple channel operation can be used to control a
7702 module. For multiple channel operation, the 7702 module is controlled in
basically the same way that a 7751/7752/7753 module is controlled (see
Section 2), except that multiple channel control (:ROUT:MULT) must be used to
control the 7702 module. More details on multiple channel operation is provided in
Section 2 of the Model 2790 Reference Manual.
The following points summarize system channel operation. Details on system channel
operation for the 7702 module is provided in Section 2 of the Model 2790 Reference
Manual.
• When an input channel is closed for a 2-wire function, a backplane isolation chan-
nel automatically closes to connect the input to the DMM of Model 2790.
Example: With the
Ω2 function selected, closing channel 1 also closes channel 45.
• When an input channel is closed for a 4-wire function or operation, the two back-
plane isolation channels and the 2-pole/4-pole relay also close to connect the input
to the DMM.
Example: With the Ω4 function selected, closing channel 1 also closes channel 21
(paired channel), 45 (backplane channels), and 43 (2-pole/4-pole relay).
• While in the normal measurement display state, only the input channel that is
closed is displayed on the Model 2790. For a 4-wire operation, the paired input
channel is not displayed.
• Only one input channel (and its paired input channel for 4-wire) can be closed at
the same time. When you close another input channel, the previous input channel
opens.
Channel assignments
To control the appropriate switching module, the slot number must be included with the
switching module channel number. The channel assignment is formatted as follows:
SCH where: S is the slot number (1 or 2)
CH is the channel number
Examples: 101 = Slot 1, Channel 1
218 = Slot 2, Channel 18
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