Gated Integrators


The SR200 Series Boxcar Averager System is a modular instrumentation platform designed to acquire and analyze fast analog signals. The system consists of a NIM compatible mainframe and modules which can be selected to tailor a system to individual requirements. The SR200 series is flexible enough to handle gate widths from 100 ps to 150 µs, repetition rates up to 50 kHz, and has both analog and digital outputs. With its low-noise inputs and low-drift outputs, the SR200 series is the standard for gated integrators and boxcar averagers.

Gated Integration

Gated integrators and boxcar averagers are designed to recover fast, repetitive, analog signals. In a typical application, a time "gate" of predetermined width is precisely positioned relative to an internal or external trigger to coincide with your signal. A gated integrator amplifies and integrates the signal that is present during the time the gate is open, ignoring noise and interference that may be present at other times.

Boxcar Averaging

Boxcar Averaging refers to the practice of averaging the output of the gated integrator over many shots of the experiment. Since any signal present during the gate will add linearly, while noise will add in a "random walk" fashion as the square root of the number of shots, averaging N shots will improve the signal-to-noise ratio by a factor of ÖN.

Analog and Digital Measurements

The SR200 series is designed to work without a computer, allowing you to quickly "tune-up" your experiment, or with a computer, automating complex measurement sequences. Modules like the SR235 Analog Processor perform signal processing functions (e.g., ratioing and background subtraction) without the need for a computer, while the SR245 Computer Interface gives you complete access to boxcar measurements over GPIB or RS-232.

SR200 Gate Scanner

SR200 Gate Scanner

Manufactured by: SRS Stanford Research Systems

The SR200 Gate Scanner module is designed to automate waveform recovery with the SR250 and SR255 Gated Integrator modules. Waveform recovery is done.....
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SR235 Analog Processor

SR235 Analog Processor

Manufactured by: SRS Stanford Research Systems

36 functions Dual inputs Post filtering and gain adjustment 2 % basic accuracy The SR235 Analog Processor provides a variety of convenient signal.....
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SR240A 350 MHz Preamplifier

SR240A 350 MHz Preamplifier

Manufactured by: SRS Stanford Research Systems

Four independent channels DC to 350 MHz bandwidth 1 ns rise and fall time Voltage gain to 625 6.4 nV/ƒ–Hz input noise 50 W input and.....
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SR245 Computer Interface

SR245 Computer Interface

Manufactured by: SRS Stanford Research Systems

Eight analog I/O ports 8-bit digital I/O port Two TTL I/O ports RS-232 and GPIB interfaces 3500 point sample memory Simple command structure The.....
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SR250 Gated Integrator

SR250 Gated Integrator

Manufactured by: SRS Stanford Research Systems

Gate width from 2 ns to 15 µs (expandable to 150 µsec) Internal rate generator Active baseline subtraction Shot-by-shot output Gate.....
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SR255 Fast Sampler

SR255 Fast Sampler

Manufactured by: SRS Stanford Research Systems

Gates of 100 ps, 200 ps, 500 ps & 1 ns Jitter <2 ps rms Droopless analog output Linear over full range 20 ns insertion delay Trigger rates to.....
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SR280 NIM Mainframe and Display

SR280 NIM Mainframe and Display

Manufactured by: SRS Stanford Research Systems

NIM compatible mainframe 9 available slots Analog, digital and bar graph meters The SR280 is the Boxcar Averager System mainframe. The mainframe is.....
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