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Keithley 428 Current Amplifier

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The Keithley 428 is available to buy refurbished used or rent, usually from our UK stock.


Contact us for the best UK price
£155 (4 Week Rate)

Rate varies with config & rental period. Please contact us for the best rental rate

Free UK Delivery
Free UK Mainland Delivery (Sales)

Manuals and Accessories
Manuals and accessories supplied

Full Warranty
Comprehensive Warranty on ALL Products

ISO9001:2008 Certified
UK Certified Quality Assurance

Keithley 428 datasheet

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Keithley 428 Current Amplifier Description:

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 2s to 300ms.

The Model 428-PROG 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-PROG can be used with any of Keithleys data acquisition boards to implement a very cost-effective, low curreent measurement system with wide bandwidth and fast response.

The Model 428-PROG incorporates a second order Bessel-function filter that mini mizes 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 sca ning tunneling electron microscopes.

Input and output connections to the Model 428-PROG are made with BNC connectors. INPUT HI is connected to a program mable +/-5V supply, which permits suitable bias voltages to be applied to devices-under-test or current collectors. This eliminates the need for a separate bias supply.

For applications where voltage offset errors exist, the ZERO CHECK and OFFSET functions can be used, thereby maintaining maximum instrument accuracy. Current suppression is also available up to 5mA, useful for suppressing background currents, such as dark currents.

The Model 428-PROG also incorporates an exterior design with simple front panel operation, improved display, and convenient system integration. Pushbutton controls have an LED to indicate if that function is activated. The 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. An IEEE-488 interface is included.

We offer the refurbished used Keithley 428 Current Amplifier for sale and rental.

The Keithley 428 is fully tested and refurbished in our in-house ISO9001 calibration laboratory. We supply manuals, accessories, full warranty and a free-of-charge Certificate of Conformity. We can also provide the Keithley 428 with a fresh calibration for a small additional charge.

If you have under-utilised test equipment talk to us about trading-in or part-exchanging it towards the Keithley 428 or other refurbished test equipment.

Last Updated: 04-Jan-2019