Keithley 2657A User Manual

Section 2: General operation Model 2657A High Power System SourceMeter® Instrument Reference Manual
2-60 2657A-901-01 Rev. B/December 2012
Item Description Qty Notes
(1) Protective earth (safety ground) for Model
2657A
1 Keithley Instruments Model CA-568-120 is a protective
earth (safety ground) cable assembly supplied with the
instrument.
(2) Interlock connection for Model 2657A 1 Pin 24 (INT) and Pin 22 (5 VDC) connected to test
fixture lid switch. Keithley Instruments Model 7709-308
is a 25-pin interlock male connector and can be used for
custom connections.
(3) Interlocked safety enclosure 1 Select a safety enclosure with an interlock that has a
normally-open (NO) switch. Also see Test fixture
(on
page 2-62).
(4) Protective earth (safety ground) for test
fixture
1 Redundant grounds may be required for specific test
setups (for example, setups that clamp LO).
(5) Model HV-CA-571-3 high-voltage triaxial
female panel mount to unterminated cable
assembly
2 See schematic for connections. Make sure to follow
High-voltage triaxial cable termination
(on page 2-44).
(6) Model HV-CA-554 high-voltage triaxial
cable assembly (male to male)
2
(7) Model 2657A High Power System
SourceMeter
®
instrument
1
Using shielding and guarding together
The following figures show connections for a test system that uses a noise shield, a safety shield, and
guarding. The guard shields are connected to the driven guard (GUARD) of the SMU. The noise
shield is connected to LO. The safety shield is connected to the chassis and to protective earth
(safety ground).
Guard voltage can be hazardous. With an unguarded device under test (DUT) connection, terminate
the guard before the end of the cable. Refer to High-voltage triaxial cable termination (on page 2-
44) for details.
Connect the enclosure of all metal test fixtures to protective earth (safety ground). See your specific
test fixture for information. Nonconductive test fixtures must be rated to double the maximum
capability of the test equipment in the system.
WARNING

Keithley 2657A Specifications

General

Brand	Keithley
Model	2657A
Category	Measuring Instruments
Language	English