Keithley 2500 Service Manual

2-4 Calibration Model 2500 Service Manual
NOTE The Calibrator/Source listed in Table 2-1 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 µA 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
Table 2-2 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:
1.9µA:
19µA:
190µA:
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.

Keithley 2500 Specifications

General

Brand	Keithley
Model	2500
Category	Measuring Instruments
Language	English