Keithley 2601B Reference Manual page 89

Series 2600B System SourceMeter® Instrument Reference Manual Section 2: General operation
Model 2611B/2612B/2614B/2634B/2635B/2636B: The maximum output voltage for a Model
2611B/2612B/2614B/2634B/2635B/2636B channel is 220 V, which is considered hazardous and
requires a safety shield. The following figures illustrate test connections for these models.
Use #18 AWG wire or larger for connections to protective earth (safety ground) and chassis.
Figure 29: Model 2611B/2612B/2614B safety shield for hazardous voltage test circuit
connections
2600BS-901-01 Rev. B / May 2013 2-65