16-4 Calibration Model 6485 Instruction Manual
Calibration errors
The Model 6485 checks for errors after each calibration step, minimizing the possibility
that improper calibration may occur due to operator error. If an error is detected during
calibration, the instrument will display an appropriate error message. The unit will then
prompt you to repeat the calibration step that caused the error.
Table 16-1
Recommended calibration equipment
Description Manufacturer/Model Specifications
Calibrator Fluke 5700A DC Voltage:
1
2V: 7ppm
20V: 5ppm
200V: 7ppm
DC Current:
1
20µA: 550ppm
200µA: 100ppm
2mA: 55ppm
20mA: 55ppm
Electrometer Calibration
Standard
Keithley Model 5156 Nominal Resistance:
2
100MΩ: 200ppm
1GΩ: 300ppm
Low-noise coax cable
BNC-to-triax adapter
BNC shielding cap
BNC-to-double banana plug adapter
Keithley 4801
Keithley 237-BNC-TRX
Keithley CAP-18
Pomona 1269
1
90-day, 23˚±5˚C full-range accuracy specifications shown. Includes ppm of range and offset. Uncertainty for 20µA output current
does not meet the recommended four-times better uncertainty specification.
2
23˚±3˚C accuracy of characterization.
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