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2-4
Calibration
NOTE
The Calibrator/Source listed in
does not quite meet the recommended
four times better uncertainty for 19
µ
A to 19mA output values. The Model 2500
may not meet factory calibration accuracy specifications on the 20
µ
A to 20mA
ranges unless further steps are taken to characterize the corresponding calibra-
tor ranges using more accurate equipment. Factory calibration uses a transfer
standard technique that yields uncertainties better than 4:1 for all calibration
points.
Calibration menu
summarizes the main calibration menu selections. To enter the calibration menu,
press the MENU key, select CAL, then press ENTER. Use the EDIT keys to move the cur-
sor and scroll through menu selections. Press ENTER to select a MENU item.
Table 2-1
Recommended calibration equipment
Description
Manufacturer/Model
Specifications
Uncertainty
Ratio
4
Calibrator/Source
Keithley 263
DC Current
1
1.9nA:
19nA:
190nA:
1.9
µ
A:
19
µ
A:
190
µ
A:
1.9mA:
19mA
2
:
±0.068%
±0.068%
±0.04%
±0.03%
±0.03%
±0.03%
±0.03%
±0.04%
15:1
6:1
7.6:1
6.75:1
3.4:1
3.4:1
3.4:1
2.6:1
Digital Multimeter
Keithley 2001
DC Voltage
3
20V:
200V:
±22ppm
±30ppm
45:1
33:1
1
90-day accuracy specifications at specified output for passive V/R amps mode except as noted.
2
90-day specifications at 19mA output for active amps mode.
3
90-day full-range accuracy specifications.
4
Ratio between test equipment uncertainty and Model 2500 uncertainty.
Summary of Contents for 2500
Page 2: ...Contains Calibrating and Servicing Information Model 2500 Dual Photodiode Meter Service Manual...
Page 11: ......
Page 13: ......
Page 15: ......
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...
Page 117: ......
Page 119: ......
Page 120: ......
Page 121: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...