Keithley 6487 Reference Manual

16-4 Calibration Model 6487 Reference Manual
Calibration errors
The Model 6487 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
Digital Multimeter Keithley Model 2001 DC Voltage:
3
10V: 32ppm
50V: 50ppm
500V: 53ppm
Low-noise triax cable
Low-noise coax cable
Triax shielding cap
Triax-to-BNC adapter
Dual banana-to-BNC adapter
Banana plug test leads
Keithley 7078-TRX-3
Keithley 4801
Keithley CAP-31
Keithley 7078-TRX-BNC
Pomona 1269
Keithley 8607
1.
90-day, 23°±5°C full-range accuracy specifications shown. Includes ppm of range and offset. Uncertainty for 20µA output cur-
rent does not meet the recommended four-times better uncertainty specification.
2.
23°±3°C accuracy of characterization.
3.
One-year, DMM accuracy specifications at specified voltage and range.

Keithley 6487 Specifications

General

Type	Picoammeter/Voltage Source
Current Measurement Range	20 fA to 20 mA
Interfaces	GPIB, RS-232
Voltage Burden	< 200 µV
Input Impedance	>10^14 Ω
Power	100 V / 120 V / 220 V / 240 V
Basic Current Measurement Accuracy	0.4%