SR430 Multichannel Scaler / Averager0 pages

Photon Counters
SR430 — 5 ns multichannel scaler/averager

SR430 Multichannel Scaler/Averager
The SR430 is the first multichannel scaler which combines
amplifiers, discriminators, bin clocks, and data analysis in a
single, integrated instrument. With its many features and its
easy-to-use menu driven interface, the SR430 simplifies timeresolved photon counting experiments.

· 5 ns to 10 ms bin width
· Count rates up to 100 MHz
· 1k to 32k bins per record

The SR430 Multichannel Scaler/Averager can be thought of
as a photon counter that counts events as a function of time.
A trigger starts the counter which segments photon count data
into sequential time bins (up to 32k bins). The width of the
bins can be set from 5 ns to 10 ms. The instrument records the
number of photons that arrive in each bin.

· Built-in discriminator
· No interchannel dead time
· On-screen data analysis
· Hardcopy output to printers/plotters
· GPIB and RS-232 interfaces

The SR430 is useful in a variety of applications where it
is necessary to count events as a function of time: LIDAR,
time of flight mass spectroscopy, and fluorescence decay
measurements are just a few examples.
Input and Discriminator
The SR430’s analog input has a 50 Ω input impedance and
an input range of ±300 mV. The maximum input sensitivity
is 10 mV, and if your input signal level is less than this, a
preamplifier (like the SR445A) is recommended. The input
is followed by a discriminator with a selectable slope and a
threshold adjustable between ±300 mV. A discriminator BNC
output is provided at the front panel that generates a NIM level
(0 to –0.7 V, active low) signal corresponding to each count.

· SR430 ... $7950 (U.S. list)

Stanford Research Systemst
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www.thinkSRS.com