4-2 Model 2790 SourceMeter
®
Switch System User’s Manual
Connections and wiring
WARNING The following information is intended for qualified service personnel.
Do not make switching module connections unless qualified to do so.
WARNING To prevent electric shock that could result in serious injury or death,
adhere to following safety precautions:
• Before removing or installing a switching module in the mainframe,
make sure the mainframe is turned off and disconnected from line
power.
• Before making or breaking connections to a switching module,
make sure power is removed from all external circuitry.
• Do not connect signals that may exceed the maximum specifications
of the module. Specifications for the switching modules are pro-
vided in Appendix A.
• Do not apply >42V between any terminal (HI or LO) and chassis
ground. Do not apply any external sources to the 7751/7752/7753
module.
NOTE 7702 allows measurement of external sources, but use extreme caution, single
faults hardware/software could detonate airbag.
Screw terminals
Screw terminals on the switching modules are used for connection to DUT and external cir-
cuitry. The Models 7751, 7752, and 7753 use quick-disconnect terminal blocks. A terminal
block can be wired outside the module and then plugged back in.
Figure 4-1 shows how to access the screw terminals on the switching module. Channel
designations for the screw terminals are contained in Figure 4-2 (7751/7752/7753) and
Figure 4-3 (7702).
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