Keithley 2790, Reference Manual

Page: 422 / 568

Model 2790 SourceMeter
®
Switch System Reference Manual 17-3
Calibration considerations
When performing the calibration procedures:
• Make sure that the equipment is properly warmed up and connected to the appro-
priate 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 2790 will generate an appropriate
error message. See
Appendix G for more information.
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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
voltage (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 Model 7751 and 7753 modules, the maximum common-
mode voltage (voltage between any plug-in module terminal and
chassis ground) is 42V. 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.