Calibration Considerations; Calibration Cycle - Keithley 6430 Instruction Manual

Calibration considerations

When performing the calibration procedures:
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WARNING
CAUTION

Calibration cycle

Perform calibration at least once a year to ensure the unit meets or exceeds its specifications.
Make sure that the test equipment is properly warmed up and connected to the correct
Model 6430 mainframe or Remote PreAmp jacks as appropriate.
Always allow the source signal to settle before calibrating each point.
Do not connect test equipment to the Model 6430 through a scanner or other switching
equipment.
If an error occurs during calibration, the Model 6430 will generate an appropriate error
message.
The maximum common-mode voltage (voltage between mainframe LO
and chassis ground or PreAmp IN/OUT LOW and chassis ground) is ±42V
DC. Exceeding this value may cause a breakdown in insulation, creating a
shock hazard.
Exceeding the following voltage values between these terminals may result
in instrument damage:
• INPUT/OUTPUT HI and LO: 250V peak.
• 4-WIRE SENSE HI and LO: 250V peak.
• INPUT/OUTPUT HI and 4-WIRE SENSE HI: 5V.
• INPUT/OUTPUT LO and 4-WIRE SENSE LO: 5V.
• Preamp IN/OUT HIGH or SENSE HI and GUARD: 40V peak.
• Preamp GUARD and IN/OUT LOW: 250V peak.
Calibration 19-3