Tektronix Keithley 2651A Reference Manual page 821

Section 9: Frequently asked questions
(1) Protective earth (safety ground). Keithley Instruments Model CA-568-120 is a protective
earth cable assembly. See
(2) Model 2651A interlock digital I/O. Pin 24 (INT) and pin 22 (5 Vdc) are connected to the test
fixture lid switch. The interlock switch is shown in the disengaged, or lid open, position.
(3) Normally-open (NO) interlock metal safety enclosure.
(4) To protective earth (safety ground) from the test fixture or protection module. Additional
connections for redundant protective earth may be required.
(5) HI and LO connections using Model HV-CA-571-3 high-voltage triaxial
female panel mount to unterminated cable assembly. LO is connected to the metal noise
shield.
(6) High-voltage triaxial cable assembly (Model HV-CA-554)
(7) Model 2651A.
9-8
Model 2651A High Power System SourceMeter® Instrument Reference Manual
Figure 125: Typical low-current connections
tek.com/keithley for ordering information.
2651A-901-01 Rev. C October 2021