Keithley 6487 - Typical Range Change Transients

G-12 Applications Guide Model 6487 Reference Manual
Figure G-9
Improper connection
Refer to “Connection fundamentals,” page 2-2 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
current-limited voltage source (Figure G-10).
Current Source
6487
Picoammeter
+
-
i
HI
LO
R
A
Current Source
6487
Picoammeter
+
-
i
HI
LO
R
A