Keithley 428-PROG Programmable Current Amplifier

Optimize your research and device lab capabilities with the Keithley 428-PROG Programmable Current Amplifier. This advanced instrument expertly converts fast, small currents into voltage, making it easy to digitize or display through oscilloscopes, waveform analyzers, or data acquisition systems. Utilizing a highly refined "feedback current" circuit, the 428-PROG achieves remarkable rise times and operates with sub-picoamp noise, offering unparalleled performance across various applications.

Key Features and Specifications

• Versatile Applications: Ideal for a diverse range of research areas, the 428-PROG amplifies fast, low currents effectively. Key applications include:
• Biochemistry Measurements: Perfect for monitoring ion channel currents through cell membranes.
• Beam Position Monitoring: Essential for use in electron storage rings and synchrotrons.
• Surface Science Studies:
  • Utilized as a system amplifier in Scanning Tunneling Electron Microscopes.
  • Facilitates observation of secondary electron emissions pertinent to X-ray and beam line currents.
• Laser and Light Measurements:
  • Fast, sensitive amplification for photomultiplier tubes and photodiodes.
  • Critical analysis of rapid photoconductive materials.
  • Designed as an IR detector amplifier.
• Transient Phenomena Studies:
  • Supports current Deep Level Transient Spectroscopy (DLTS) studies.
  • Investigates breakdowns in devices and dielectric materials.
• Real-time Display: Easily connect to oscilloscopes or waveform digitizers to visualize very low currents instantly.
• Fast Response Rates: Tailored for swift response even at low current levels.
• Flexible Amplification Ranges: With nine current amplification ranges, achieve the perfect balance between speed and noise reduction.
• Integration with Data Acquisition Boards: Seamlessly works with any Keithley data acquisition board for a cost-effective, high-performance low current measurement system.
• Noise Minimization: Features a second-order Bessel-function filter that reduces noise without compromising rise time on high-gain settings.
• Convenient Connectivity: Input and output connections utilize BNC connectors, with the INPUT HI connected to a programmable ±5V supply, allowing direct bias voltage application to devices-under-test or current collectors—removing the necessity for a separate bias supply.
• User-Friendly Design:
  • Front panel operations for ease of use.
  • Pushbutton controls equipped with LED indicators for active functions.
  • Brightness control with three selectable intensities (bright, dim, and off) for visibility in light-sensitive environments.
  • All setup values are conveniently displayed directly from the front panel.
• Performance Metrics:
  • Rise time of just 2μs.
  • Impressive noise specification of 1.2fA rms.
  • Gain capability of up to 10¹¹ V/A.
  • Supports IEEE-488 interface for enhanced connectivity.