Keithley 6485 User Manual

I-12 Applications Guide Model 6485 Picoammeter Instruction Manual
Figure I-9
Improper connection
Refer to “Input cables, connectors, and adapters,” page 1-4 for details on appropriate types
of cabling and connectors to use when making picoammeter measurements.
Typical range change transients
During a range change, a picoammeter cannot perfectly maintain its voltage burden speci-
fication. When a range change occurs, the picoammeter will momentarily become a cur-
rent-limited voltage source, as shown in Figure I-10.
Current Source
6485
Picoammeter
+
-
i
HI
LO
R
A
Current Source
6485
Picoammeter
+
-
i
HI
LO
R
A

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)