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 time-resolved photon counting experiments.
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 (upto 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.
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.
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 SR445) should be used.
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-.7 V, active low) signal corresponding to each count.