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Model 2790 SourceMeter
Figure 2-2
7702 4-wire system channel connections to Model 2790 DMM
Model 7702 Switching Module
System channel operation:
Close channel 201
Controlling the system channel
When a 7702 measurement channel is closed, a previous system channel (and, for a 4-wire
function, its paired channel) is opened. The closed measurement channel becomes the sys-
tem channel. When a 4-wire function is selected, the paired channel for the system chan-
nel also closes.
and
These front panel keys
measurement channel as the system channel. If there are no measurement channels
available, one of the following messages will be briefly displayed when one of these keys
is pressed:
NO SCAN CARD — This message indicates that there are no switching modules (or
pseudocards) installed; both slots are empty.
NO MEAS CARD — This message indicates that none of the installed switching modules
(or pseudocards) are a 7702. For example, the Model 7751 and 7752 switching modules do
not have any measurement channels. Those channels cannot be internally connected to the
DMM.
®
Switch System Reference Manual
Channel 1
HI
Channel 1
LO
(closed position
Channel 21
HI
Channel 21
LO
keys
(Figure
Model 2790
Relay
Channel 45
Backplane
Channel
43
2-Pole/4-Pole
shown
)
Relay
Channel 44
Backplane
Isolation
2-3) can be used to select the next or previous 7702
Slot 2
DMM
HI
Input
LO
Isolation
Relay
Relay
HI
Sense
LO
Relay
2-9
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