Keithley 6485 User 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.

Keithley 6485 Specifications

General

Model	Keithley 6485
Category	Picoammeter
Input Impedance	>10^14 Ohms
Voltage Burden	<200µV
Accuracy	0.4% of reading
Voltage Source Range	Not Applicable
Voltage Source Resolution	Not Applicable
Voltage Source Accuracy	Not Applicable
Interface	IEEE-488
Power Requirements	100V to 240V AC, 50/60Hz
Dimensions	89 mm high x 214 mm wide x 369 mm deep (3.5 in x 8.4 in x 14.5 in)