Calibration 19-3
Calibration considerations
When performing the calibration procedures:
• 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.
WARNING 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.
CAUTION 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 cycle
Perform calibration at least once a year to ensure the unit meets or exceeds its specifications.
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