Line Power; Calibration Considerations; Calibration Cycle - Keithley 3700 series Reference Manual

Section 11: Calibration

Line power

The Series 3700 requires a line voltage of 100V-240V (±10%), and a line frequency of 50Hz or
60Hz.
NOTE

Calibration considerations

When performing the calibration procedures:
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WARNING

Calibration cycle

Perform comprehensive calibration at least once a year, or every 90 days to ensure the unit
meets the corresponding specifications.
11-2
The line frequency is automatically sensed at power-up.
Make sure that the equipment is properly warmed up and connected to the appropriate
input jacks.
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 Series 3700 will generate an appropriate error
message. See ―Error summary‖ for more information.
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 plug-in modules, the maximum common-mode voltage (voltage
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.
All cable insulation voltage ratings must equal or exceed the maximum
voltage applied to the plug-in module terminals.
Series 3700 System Switch/Multimeter Reference Manual
Document Number: 3700S-901-01 Rev. A / August 2007