file icon Low Current High Resistance Measurement Technical Information
Programmable Electrometer
The Model 6514 Electrometer combines flexible interfacing capabilities with current sensitivity, charge measurement capabilities, resolution, and speed that are equal or superior to our earlier electrometers. The Model 6514's built-in IEEE-488, RS-232, and digital I/O interfaces make it simple to configure fully automated, high speed systems for low-level testing.

<1fA noise
>200TΩ input impedance on voltage measurements
Charge measurements from 10fC to 20μC
High speed - up to 1200 readings/second
Interfaces readily with switches, computers, and component handlers
Cancels voltage and current offsets easily

Electrometer/High-Resistance Meter

Keithley's 5½-digit Model 6517B Electrometer/High Resistance Meter offers accuracy and sensitivity specifications unmatched by any other meter of this type. It also offers a variety of features that simplifies measuring high resistances and the resistivity of insulating materials.
Measures resistances up to 10E16 Ω
1fA-20mA current measurement range
<20μV burden voltage on lowest current ranges
200TΩ input impedance
<3fA bias current
Up to 425 rdgs/s
0.75fA p-p noise
Built-in ±1kV voltage source
Unique voltage reversal method for high resistance measurements
Optional plug-in scanner cards

Picoammeter/Voltage Source
The 5-1/2-digit Model 6487 Picoammeter/Voltage Source improves on the measurement capability Model 6485, and adds a high resolution 500V source. With eight current measurement ranges and high speed autoranging, this cost effective instrument can measure currents from 20fA to 20mA, take measurements at speeds up to 1000 readings per second, and source voltage from 200μV to 505V.
10fA resolution
<200μV burden voltage
Alternating Voltage method ohms measurements
Automated voltage sweeps for I-V characterization
Floating measurements up to 500V
Up to 1000 readings/second
IEEE-488 and RS-232 interfaces
Analog output
Digital I/O
5-1/2 digit Picoammeter with 10fA Resolution
The 5-1/2-digit Model 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, this cost-effective instrument can measure currents from 20fA to 20mA, taking measurements at speeds up to 1000 readings per second.
10fA resolution
<200μV burden voltage
Up to 1000 readings/second
IEEE-488 and RS-232 interfaces
Analog output
DC Precision Current Source
The Model 6220 DC Current Source and Model 6221 AC and DC Current Source combine ease of use with exceptionally low current noise. Low current sourcing is critical to applications in test environments ranging from R&D to production, especially in the semiconductor, nanotechnology, and superconductor industries.
Source and sink (programmable load) 100fA to 100mA
10E14 Ω output impedance ensures stable current sourcing into variable loads
65000-point source memory allows executing comprehensive test current sweeps directly from the current source
Built-in RS-232, GPIB, Trigger Link, and digital I/O interfaces
Reconfigurable triax output simplifies matching the application's guarding requirements
Instrument control software available for PC controllers Source AC currents from 2pA to 100mA for AC characterization of components and materials
10MHz output update rate generates smooth sine waves up to 100kHz
Built-in standard and arbitrary waveform generators with 1mHz to 100kHz frequency range. Applications include use as a complex programmable load or sensor signal and for noise emulation
Programmable pulse widths as short as 5µs, limiting power dissipation in delicate components. Supports pulsed I-V measurements down to 50µs when used with Model 2182A Nanovoltmeter
Built-in Ethernet interface for easy remote control without a GPIB controller card
AC and DC Current Source