Section 2: General operation Model 2657A High Power System SourceMeter® Instrument Reference Manual
2-54 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.
(2a) Interlock connection for Model 2657A 1 Pin 24 (INT) and Pin 22 (5 VDC) are connected to the test fixture
lid switch. Pin 19 is used to connect the digital grounds. Keithley
Instruments Model 7709-308 is a 25-pin interlock male connector
and can be used for custom connections.
(2b) Interlock connection for Model 263xB 1 Pin 24 (INT) is connected to the test fixture lid switch. Pin 19
(GND) is used to connect the digital grounds. Keithley
Instruments Model 7709-308 is a 25-pin interlock male connector
and can be used for custom connections.
(3) Interlocked metal safety enclosure 1 Select a safety enclosure with an interlock that has a normally-
open (NO) switch.
(4) Protective earth (safety ground) for test
fixture
2 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
4 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)
4
(7) Model 2657A High Power System
SourceMeter
®
instrument
1
(8) Model 2657A-PM-200 protection module 1 Refer to documentation provided with Model 2657A-PM-200 for
more information.
(9) Model 7078-TRX triaxial cable assembly 2
(10) Model 263xB 1 Model 261xB may be substituted for the Model 263xB. If using a
Model 261xB, a Model 2600-TRIAX 8-pin pheonix to triaxial
adapter must be used.