Tektronix Encore

Keithley 428-PROG
Programmable Current Amplifier

Amplifiers - RF and Microwave >> Accessories and Other >> Programmable Current Amplifier
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Manufacturer: Keithley
Model: 428-PROG

Keithley 428-PROG Programmable Current Amplifier

Electronic Test and Measurement Equipment

Keithley 428-PROG Programmable Current Amplifier Product Datasheet Download Product Datasheet

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Product Overview

The Keithley 428-PROG Programmable Current Amplifier converts fast, small currents to a voltage, which can be easily digitized or displayed by an oscilloscope, waveform analyzer, or data acquisitionsystem. It uses a sophisticated "feedback current" circuit to achieve both fast rise times and sub-picoamp noise. The gain of the Keithley 428-PROG is adjustable in decade increments from 103V/A to 1011V/A, with selectable rise times from 2μs to 300ms.

Features and Specifications of the Keithley 428-PROG Programmable Current Amplifier include:

  • Applications in research and device labs due to its cost-effective ability to amplify fast, low currents, incude:
    • Biochemistry Measurements:  Ion channel currents through cell walls and membranes
    • Beam Position Monitoring:  Used on electron storage rings and synchrotrons
    • Surface Science Studies:
      • Scanning Tunneling Electron Microscope system amplifier
      • Observation of secondary electron emission, as in X-ray and beam line currents
    • Laser and Light Measurements: 
      • Fast, sensitive amplifier for use with PMTs and photodiodes
      • Analysis of fast photoconductive materials
      • IR detector amplifier
    • Transient Phenomena:
      • Current DLTS studies
      • Breakdown in devices and dielectric materials
  • Can be connected to an oscilloscope or waveform digitizer to display very low currents in real time
  • Offers fast response at low current levels
  • Nine current amplification ranges allow the greatest flexibility in making speed/noise tradeoffs
  • Can be used with any of Keithley’s data acquisition boards to implement a very cost-effective, low current measurement system with wide bandwidth and fast response
  • Incorporates a second order Bessel-function filter that minimizes noise without increasing rise time on high-gain ranges
  • Input and output connections are made with BNC connectors:
    • INPUT HI is connected to a programmable ±5V supply
    • Permits suitable bias voltages to be applied to devices-under-test or current collectors
    • This eliminates the need for a separate bias supply
  • Exterior design incorporates:
    • Front panel operation
    • Pushbutton controls have an LED to indicate if that function is activated
    • Display features three selectable intensities (bright, dim, and off) for use in light-sensitive environments
    • All setup values can be displayed from the front panel
  • 2μs rise time
  • 1.2fA rms noise
  • Up to 1011 V/A gain
  • IEEE-488 interface

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