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428 - Keithley Current Amplifiers


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  • Model: 428
  • Manufactured by: Keithley
  • Bandwidth: 175.00kHz
  • Gain [V/A]: 1x10^3 to 1x10^11
  • Input Noise: n/a
  • Extra Specifications: Programmable Current Amplifier
The Model 428 Programmable Current Amplifier converts fast, small currents to a voltage, which can be easily digitized or displayed by an oscilloscope, waveform analyzer, or data acquisition system. It uses a sophisticated feedback current circuit to achieve both fast rise times and sub-picoamp noise. The gain of the Model 428 is adjustable in decade increments from 103V/A to 1011V/A, with selectable rise times from 2┬Ás to 300ms. The Model 428 offers fast response at low current levels, which is unmatched by either electrometers or picoammeters. The nine current amplification ranges allow the greatest flexibility in making speed/noise tradeoffs. The Model 428 can be used with any of Keithley s data acquisition boards to implement a very cost-effective, low curreent measurement system with wide bandwidth and fast response. The Model 428 incorporates a second-order Bessel-function filter that minimizes noise without increasing rise time on high-gain ranges. This can be defeated in situations where 6dB/octave roll-off is desired, as in control loops of scanning tunneling electron microscopes.
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