Boxcar Series Gated Integrators and Boxcar Averagers0 pages

Gated Integrators and Boxcar Averagers
SR200 Series — Product overview

SRS Boxcar Systems
· NIM mainframe (pg. 222)
· 2 ns gated integrator (pg. 223)
· 100 ps fast sampler (pg. 226)
· GPIB and RS-232 communication (pg. 229)
· 350 MHz preamplifier (pg. 231)

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

· Gate scanner (pg. 232)

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.

· Analog math processor (pg. 233)
· Windows software (pg. 234)

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 √N.

Stanford Research Systemst
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