428-PROG - Keithley Current Amplifiers

175.00kHz (Bandwidth)

The Model 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 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-PROG is adjustable in decade increments from 103V/A to 1011V/A, with selectable rise times from 2µs to 300ms.

2µs rise time
1.2fA rms noise
Up to 1011 V/A gain
IEEE-488 interface
Fast response at low current levels
Incorporates a second-order Bessel-function filter that minimizes noise without increasing rise time on high-gain ranges
Can be connected to an oscilloscope or waveform digitizer to display very low currents in real time
Simple front panel operation with LED indicators, and selectable display intensities

Specifications

Bandwidth

175.00kHz

Gain [V/A]

10^11

Input Noise

1.2fA rms

More Details

Programmable Current Amplifier

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