Section 2: General operation
Model 2657A High Power System SourceMeter® Instrument Reference Manual
2-62
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
(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 the
specifications in
High-voltage triaxial cable termination
(6)
Model HV-CA-554 high-voltage triaxial
cable assembly (male to male)
2
(7)
Model 2657A High Power System
SourceMeter
®
instrument
1
Test fixture
A test fixture can be used to house a device or test circuit. The test fixture can be a metal or
nonconductive enclosure, and is typically equipped with a lid. When the test fixture is correctly
connected, the output of the Model 2657A will turn off when the lid of the test fixture is opened.
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.
You mount the test circuit inside the test fixture.
To provide protection from shock hazards, an enclosure should be provided that surrounds all live
parts.
Nonconductive enclosures must be constructed of materials that are suitably rated for flammability
and the voltage and temperature requirements of the test circuit. 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.
For metallic enclosures, the test fixture chassis must be properly connected to protective earth
(safety ground). A grounding wire (#16 AWG or larger) must be attached securely to the test fixture
at a screw terminal designed for safety grounding. The other end of the ground wire must be
attached to a known protective earth (safety ground).
WARNING
Summary of Contents for 2657A
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