Keithley 2657A User Manual

Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 2: General operation
2657A-901-01 Rev. B/December 2012 2-43
The maximum common-mode voltage (voltage between LO and chassis ground) is 250 V DC.
Exceeding this value may cause a breakdown in insulation, creating a shock hazard that could result
in personal injury or death.
The input/output terminals of the Model 2657A High Power System SourceMeter

instrument SMU
are rated for connection to circuits rated Measurement Category I only, with transients rated less
than 1500 V peak above the maximum rated input. Do not connect the Model 2657A terminals to
CAT II, CAT III, or CAT IV circuits. Connection of the Model 2657A terminals to circuits higher than
CAT I can cause damage to the equipment or expose the operator to hazardous voltage.
Hazardous voltages may be present on all output and guard terminals. To prevent electrical shock
that could cause injury or death, never make or break connections to the Model 2657A while the
instrument is powered on. Turn off the equipment from the front panel or disconnect the main
power cord from the rear of the Model 2657A before handling cables. Putting the equipment into
standby does not guarantee that the outputs are powered off if a hardware or software fault occurs.
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 2657A, a user-supplied fuse,
rated at no more than 120 mA SLO-BLO should be installed in-line with the Model 2657A
input/output connectors.
Figure 11: Model 2657A input/output connectors
WARNING
HI* LO*
LO**
Chassis
ground ***
SENSE LO* SENSE HI*
Triaxial cable conductors
* Center conductor
** Inner shield
*** Outer shield
!
A
TOR SERVICEABLE PARTS,
I
ED PERSONNEL ONLY.
H
SAME TYPE AND RATING.
INPUT/OUTPUT CURRENT: 120 mA MAX.
!
SENSE
LO
HI
LO
GUARD
SENSE
HI
LO
3030 VDC
MAX.
250 V
MAX.
Chassis
ground ***
Chassis
ground ***
Chassis
ground ***
GUARD**GUARD**

Keithley 2657A Specifications

General

Brand	Keithley
Model	2657A
Category	Measuring Instruments
Language	English