The
Model 485 Autoranging Picoammeter provides 100fA sensitivity
with 41/2-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
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's input voltage drop (burden) is actively
constrained by feedback techniques to less than 200µV.
Thus the 485 makes high accuracy current measurements
even in circuits with very low source voltages.
Addition
of the Model 4853 IEEE-488 Interface to the 485 provides
fully programmable computer control. For isolation
from the power line or for portability, the 485 can
be battery powered with the Model 1758 Rechargeable
Battery Pack.
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