Unit has been checked for appropriate readings down to the 20 nA range.
There’s a broken ear on the cord-wrap underneath the instrument.
This instrument can be delivered with a fresh Guaranteed Pass calibration at additional cost. Please inquire if interested.
We offer a 5-day right of refusal as well as 90-day warranty against defects. Complete terms can be found here.
The Model 485 Autoranging Picoammeter provides 100fA sensitivity with 4
1/2-digit resolution in a low-cost, highly sensitive, easy-to-use instrument.
The 485 measures DC current on seven ranges covering 10 decades from
100fA to 2mA. The input can withstand overloads as high as 1000V (with
100k ohm limiting resistor) for flexibility in a wide range of applications in test,
research, and student labs. An analog output linearly converts the incoming
current to voltage for hard copy output or control loop applications.
In addition to 100fA sensitivity, the 485 has both excellent accuracy and low
voltage burden. One-year accuracy on the most sensitive range is an
impressive 0.4%. The 485 input voltage drop (burden) is actively constrained
by feedback techniques to less than 200uV. Thus the 485 makes high
accuracy current measurements even in circuits with very low source
Please note: Any test equipment depicted other than that listed below is for demonstration purposes and is not included in the sale.
What’s In The Box
- Keithley 485 Picoammeter unit (no accessories)