Keithley 6487 Reference Manual

15
Performance Verification
• Verification test requirements — Summarizes environmental conditions, warm-
up period, and line power requirements.
• Recommended test equipment — Lists all equipment necessary for verification
and gives pertinent specifications.
• Verification limits — Describes how reading limits are calculated and gives an
example.
• Calibrator voltage calculations — Details the method for calculating calibrator
voltages when testing the 2nA to 2μA ranges.
• Performing the verification test procedures — Summarizes test considerations
and describes how to restore factory defaults.
• Offset voltage calibration — Lists steps necessary to null voltage offset before
performing verification.
• Current measurement accuracy — Lists detailed steps for verifying measure-
ment accuracy of all current ranges. The 2nA to 2μA and 20μA to 20mA ranges
are covered separately because of the different test equipment required.
• Voltage source output accuracy — Summarizes the method to test voltage source
output accuracy.

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%