Tektronix Keithley 2651A Reference Manual page 71

Section 2: General operation Model 2651A High Power System SourceMeter® Instrument Reference Manual
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 Model 2651A 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 2-63) later in
this section for details on floating the SMUs.
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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.
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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.
Figure 12: Model 2651A input/output connectors
2-46 2651A-901-01 Rev. C October 2021