Calibration Considerations - Keithley 2651A Reference Manual

Model 2651A High Power System SourceMeter® Instrument Reference Manual

Calibration considerations

When performing the calibration procedures:
•
Make sure that the test equipment is properly warmed up and connected to the correct Model
2651A terminals.
•
Always allow the source signal to settle before calibrating each point.
•
Do not connect test equipment to the Model 2651A through a scanner or other switching
equipment.
•
If an error occurs during calibration, the Model 2651A will generate an appropriate error message.
See Error summary
The maximum common-mode voltage (voltage between LO and chassis ground) is 250V DC.
Exceeding this value may cause a breakdown in insulation, creating a shock hazard that could
result in personal injury or death.
The Input/Output terminals of the Model 2651As are rated for connection to circuits rated
Installation Category I only, with transients rated less than 1500V peak. Do not connect the
Model 2651A terminals to CAT II, CAT III, or CAT IV circuits. Connection of the Model 2651A
terminals to circuits higher than CAT I can cause damage to the equipment or expose the
operator to hazardous voltage.
Hazardous voltages may be present on the output and guard terminals. To prevent electrical
shock that could cause injury or death, NEVER make or break connections to the Model 2651A
while the unit is on. Power off the equipment from the front panel or disconnect the main
power cord from the rear of the Model 2651A before handling cables connected to the outputs.
Putting the equipment into standby mode does not guarantee the outputs are not powered if a
hardware or software fault occurs.
Calibration cycle
Perform calibration at least once a year to ensure the unit meets or exceeds its specifications.
2651A-901-01 Rev. A / March 2011
(on page 8-1) for more information.
WARNING
Appendix B: Calibration
B-17