Section 2: General operation
Model 2651A High Power System SourceMeter® Instrument Reference Manual
2-42
2651A-901-01 Rev. A / March 2011
DUT test connections
Input/output connectors
The Keithley Instruments Model 2651A High Power System SourceMeter
®
Instrument uses screw
terminal connectors for input and output connections to devices under test (DUTs) as shown below.
A connector can be removed from the rear panel by loosening the two captive retaining screws and
pulling it off the
(on page 2-5). Each screw in the terminal connector cable assembly (used
with the terminal connector) can accommodate from 24 AWG (0.2 mm
2
) to 12 AWG (2.5 mm
2
)
conductors. The screws in the output connector cable assembly (used with the output connector)
requires use of 6 AWG (16 mm
2
) conductors.
Basic connection sequence:
1. With the connector uninstalled from the Model 2651A rear panel, make the wire connections from
a connector to the DUT.
2. Reinstall the connector onto the rear panel.
3. Tighten the two captive screws.
WARNING
Hazardous voltages may be present on the output and guard terminals. To prevent electrical
shock that could cause injury or death, NEVER make or break connections to the Model 2651A
while the output is on. Power off the equipment from the front panel or disconnect the main
power cord from the rear of a High Power System SourceMeter
®
Instrument before handling
cables connected to the outputs. Putting the equipment into standby does not guarantee the
outputs are not powered if a hardware or software fault occurs.
Maximum floating (common mode) voltage for a SMU is 250 V. Exceeding this level could
damage the instrument and create a shock hazard. See
Floating a SMU
(on page 2-58) later in
this section for details on floating the SMUs.
The input/output connectors of the High Power System SourceMeter
®
Instrument are rated for
connection to circuits rated Installation Category I only, with transients rated less than 1500 V
peak. Do not connect the Model 2651A terminals to CAT II, CAT III, or CAT IV circuits.
Connections of the input/output connectors to circuits higher than CAT I can cause damage to
the equipment or expose the operator to hazardous voltages.
To prevent electric shock and/or damage to the High Power System SourceMeter
®
Instrument,
when connecting to a source with a greater current capability than the Model 2651A, a user-
supplied fuse, rated at no more than 20 A SLO-BLO, should be installed in-line with the Model
2651A input/output connectors.
