Keithley 6485
Picoammeter, 5.5 Digit, 10fA Resolution

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Product Overview

The Keithley 6485 Picoammeter combines Keithley's expertise in sensitive current measurement instrumentation with enhanced speed and a robust design. With eight current measurement ranges and high speed autoranging, cost-effective Keithley 6485 Picoammeter can measure currents from 20fA to 20mA, taking measurements at speeds up to 1000 readings per second.

The Keithley 6485 Picoammeter’s 10fA resolution and superior sensitivity make it well suited for characterizing low current phenomena, while its 20mA range lets it measure currents high enough for applications such as measuring 4-20mA sensor loops.

While DMMs typically employ shunt ammeter circuitry to measure current, the Keithley 6485 is a feedback picoammeter. This design reduces voltage burden by several orders of magnitude, resulting in a voltage burden of less than 200μV on the lower measurement ranges. The low voltage burden makes the Keithley 6485 Picoammeter function much more like an ideal ammeter than a DMM, so it can make current measurements with high accuracy, even in circuits with very low source voltages.

Features and Specifications of the Keithely 6485 Picommeter include:

• Cost-effective low current measurement solution
• Scaled Voltage Analog Output allows for transmitting measurement results to devices like DMMs, data acquisiton boards, oscilloscopes, or strip chart recorders
• 220V overload protection
• One-touch front panel design allows functions to be easily configured without complicated function menus
• Built-in trigger link interface symplifies sychronizing  with other instruments and voltage sources
• Display on/off switch allows display to be switched off to avoid introducing light that could reduce the accuracy of the results
• REL and LOG functions allow relative readings with respect to a baseline value or display the logarithm of the absolute value of the measured current
• Resistance calculations capability by dividing an externally sourced voltage value by the measured current
• Rear panel BNC inputs
• fA resolution
• 5-1/2 digit resolution
• <200µV burden voltage
• Up to 1000 readings/second
• Built-in Model 485 emulation mode
• IEEE-488 and RS-232 interfaces