1-2 Performance Verification
Introduction
Use the procedures in this section to verify that Model 2303, Model 2303B, or Model
2303-PJ accuracy is within the limits stated in the accuracy specifications. You can perform these
verification procedures:
• When you first receive the unit to make sure that it was not damaged during shipment.
• To verify that the unit meets factory specifications.
• To determine if calibration is required.
• Following calibration to make sure it was performed properly.
WARNING The information in this section is intended only for qualified service per-
sonnel. Do not attempt these procedures unless you are qualified to do so.
NOTE If the power supply is still under warranty, and its performance is outside specified
limits, contact your Keithley representative or the factory to determine the correct
course of action.
Verificationtestrequirements
Be sure that you perform the verification tests:
• Under the proper environmental conditions.
• After the specified warm-up period.
• Using the correct line voltage.
• Using the proper test equipment.
• Using the specified output signals and reading limits.
Environmentalconditions
Conduct your performance verification procedures in a test environment with:
• An ambient temperature of 18-28°C (65-82°F).
• A relative humidity of less than 70% unless otherwise noted.
Warm-upperiod
Allow the Model 2303 to warm up for at least one hour before conducting the verification
procedures.
If the unit has been subjected to temperature extremes (those outside the ranges stated above),
allow additional time for the instrument’s internal temperature to stabilize. Typically, allow one
extra hour to stabilize a unit that is 10°C (18°F) outside the specified temperature range.
Also, allow the test equipmentto warm up for the minimum time specified by the manufacturer.
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