Keithley 2700, Service Manual

Page: 51 / 174

Calibration 2-3
Calibration considerations
When performing the calibration procedures:
• Make sure that the equipment is properly warmed up and connected to the appropriate
input jacks. Also make sure that the correct front or rear terminals are selected with the
INPUTS switch.
• Make sure the calibrator is in OPERATE before you complete each calibration step.
• Always let the source signal settle before calibrating each point.
• If an error occurs during calibration, the Model 2700 will generate an appropriate error
message. See Appendix B for more information.
WARNING Observe the following safety precautions when performing these tests:
• Some of the procedures in this section may expose you to dangerous
voltages. Use standard safety precautions when such dangerous
voltages are encountered to avoid personal injury or death caused by
electric shock.
• For the front panel terminals only, the maximum common-mode volt-
age (voltage between INPUT LO and chassis ground) is 500V peak.
Exceeding this value may cause a breakdown in insulation, creating a
shock hazard.
• For the plug-in modules, the maximum common-mode voltage (volt-
age between any plug-in module terminal and chassis ground) is 300V
DC or 300V RMS. Exceeding this value may cause a breakdown in
insulation, creating a shock hazard.
• When using the front panel terminals simultaneously with plug-in
modules, all cable insulation voltage ratings must equal or exceed the
maximum voltage applied to either the front panel terminals or the
plug-in module terminals.