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Date: 02 December 2008
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439 Digital Current Integrator  
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439 Digital Current Integrator

Product Name: 439 Digital Current Integrator

Product Description

439 Digital Current Integrator
Measures dc or average value of pulse currents
Usable as digital current integrator, digital charge integrator, or digital electrometer
Wide dynamic range
Input protected to ±1000 V (0.01 µF) or ±2000 V (0.001 µF)
The ORTEC Model 439 Digital Current Integrator was designed to accurately measure dc currents or the average value of pulse currents such as produced by accelerator beams. It digitizes the input current by producing an output pulse for specific values of input charge. A front-panel switch permit the selection of three different amounts of charge (10–10, 10– 8 or 10– 6 coulomb) required to produce an output pulse. The instrument has a digitizing rate from 0 to 10 kHz to provide wide dynamic range on each setting and high-resolution readout without meter interpolation. 

The Model 439, when combined with a preset counter, forms a digital charge integrator. When it is combined with a counter and timer, a digital electrometer is obtained.
A front-panel meter is provided to read the input current. Full-scale analog outputs of 1 mA, 100 mV, and 10 mV are provided on rear-panel binding posts. Full-scale readings for the front-panel meter and the analog outputs can be selected in 15 steps from 1 X 10–9 to 1 X 10–2 A. The input is protected from damage by application of a large input charge.

Front- and rear-panel BNC connectors are provided for the application of a Gate signal to inhibit the digitized output. This Gate may be used to remotely control the Model 439 or it may be used to inhibit the digitized output with a multichannel analyzer dead time output signal.

Company Details

From its inception as a small enterprise founded by scientists and engineers from the Oak Ridge National Laboratory, our business and reputation for excellence in scientific instrumentation have grown substantially. Along with that growth came... more

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