Keithley 6485 - Typical range change transients

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