Keithley 485: Difference between revisions
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|class=Multimeter | |class=Multimeter | ||
|series= | |series= | ||
|summary= | |summary=Digital picoamperemeter | ||
|image=Keithley 485 front.jpg | |image=Keithley 485 front.jpg | ||
|caption=Keithley 485 front | |caption=Keithley 485 front | ||
Revision as of 04:10, 24 May 2024
The Keithley 485 Picoamperemeter is a dedicated picoamperemeter from the mid-1980s, from the same generation and model series as the better-known Keithley 197 "Microvolt DMM".
The 485 operates as a feedback (transimpedance) amperemeter (i.e. the input burden is constantly low at less than 0.2 mV), has a resolution of 4½ digits (19999), some rudimentary built-in logging capabilities, as well as an optional GPIB interface.
This instrument measures only (low) currents, in seven decadic ranges from 2 nA to 2 mA full scale. In the 2 nA ranget The least significant digit resolves 100 fA (0.1 pA).
Key Specifications
| Current | 7 decade ranges, 2 nA to 2 mA full scale |
|---|---|
| Display | 4½ digits, LED |