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2-2
Calibration
Introduction
Use the procedures in this section to calibrate the Model 2500 Dual Photodiode Meter.
These procedures require accurate test equipment to supply precise currents and measure
accurate DC voltages. Calibration can be performed either from the front panel or by send-
ing SCPI calibration commands over the IEEE-488 bus or RS-232 port with the aid of a
computer.
WARNING
The information in this section is intended for qualified service person-
nel only. Do not attempt these procedures unless you are qualified to do
so. Some of these procedures may expose you to hazardous voltages.
Environmental conditions
Temperature and relative humidity
Conduct the calibration procedures at an ambient temperature of 65-82°F (18-28°C) with
relative humidity of less than 70% unless otherwise noted.
Warm-up period
Allow the Model 2500 to warm up for at least one hour before performing calibration.
If the instrument 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 50°F (10°C) outside the specified
temperature range.
Allow the test equipment to warm up for the minimum time specified by the manufacturer.
Line power
The Model 2500 requires a line voltage of 100V / 120V / 200V / 240V (depending on line
voltage setting) at line frequency of 50 or 60Hz. The instrument must be calibrated while
operating from a line voltage within this range. Make sure the line voltage setting seen
through the small window in the rear panel power module is at the required setting. If not,
change the setting as covered in Section 3.
Summary of Contents for 2500
Page 2: ...Contains Calibrating and Servicing Information Model 2500 Dual Photodiode Meter Service Manual...
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Page 16: ...1 PerformanceVerification...
Page 28: ...2 Calibration...
Page 56: ...3 RoutineMaintenance...
Page 59: ...3 4 Routine Maintenance Model 2500 Service Manual...
Page 60: ...4 Troubleshooting...
Page 74: ...5 Disassembly...
Page 81: ...5 8 Disassembly Model 2500 Service Manual...
Page 82: ...6 ReplaceableParts...
Page 93: ...6 12 Replaceable Parts Model 2500 Service Manual...
Page 94: ...A Specifications...
Page 98: ...B CalibrationReference...
Page 108: ...C CalibrationProgram...
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Page 121: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...