Model 2790 SourceMeter
®
Switch System User’s Manual 5-3
Closed channels for test circuits
Test circuits show which channel switches need to be closed to make the test connections.
Keep in mind that these, and only these channels must be closed for the test. All other
channels in the system must be open. As a rule, ALWAYS open all channels at the begin-
ning and end of a test.
NOTE To use the DMM of the Model 2790 to measure a DUT connected to a switching
module, the front panel INPUTS switch must be in the REAR (in) position.
Test system
Figure 5-1 shows a typical test system and connections using a programmable logic con-
troller (PLC) or a PC. Connections for the test signals (and interlock) are covered in “Test
signal connections.”
NOTE Only one Model 7753 can be installed in a Model 2790, and it should be installed
in slot 1. A 7753 module can be used in slot 2, but measurement accuracy might be
adversely affected because cards are always calibrated in slot 1.
Figure 5-1
System connections
Inflator Under
Test
Test Station
(with Interlock)
Slot 2
Keithley 2790
Interlock
Interlock
Slot 1
Test
System
Expansion
2.790000
MATH
Ω
RS-232
Mechanical
Connection
Device Handler
PC
(GPIB)
OR
RS-232 Cable
(DB-9)
Keithley
7709-5
GPIB Cable
IEEE-488
Cable 7008-3,
7008-6
1. When using a PLC, select and configure the RS-232 interface of the 2790.
2. If using a PC, select the GPIB interface and set the address of the 2790.
3. Use a cable terminated with a female DB-9 connector to mate to the DIGITAL I/O connector of the 2790.
4. Cable must be wired as a straight-through cable (not null modem cable).
1
2
DB-9 Cable
3
DIGITAL I/O
Test Signal
Cabling
KPCI-488
Interface
PLC
or PC
(RS-232)
4
7751, 7752, or
7753 Module
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