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SR430Multichannel Scaler / Averager

SR430Multichannel Scaler / Averager
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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. Stanford Research Systems

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SR430 Multichannel Scaler/Averager Trigger Timing A trigger pulse starts the data acquisition cycle. The SR430 offers a choice of bin widths ranging from 5 ns to 10.486 ms. Alternatively, an external bin clock can be provided to the SR430, allowing you to define your own bin size. The number of bins in each record is adjustable from 1k (1024) to 32k in 1k increments. Data acquisition in the SR430 is seamless—there is no dead time between bins. Once the selected number of bins has been recorded, the SR430 either adds or subtracts the result of the current record from the accumulated bin...

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Signal Input Bandwidth Input impedance Linear range Input protection Overload recovery Counters/Accumulation DC to 250 MHz 50 Ω ±300 mV (at input) ±5 VDC, 50 V for 1 µs 5 ns for <10 µs duration overload Discriminator Discriminator range –300 mV to +300 mV Resolution 0.2 mV Slope Positive or negative Accuracy 2 mV + 1 % Min. pulse amplitude 10 mV Pulse-pair resolution 10 ns (typ.) Discriminator output NIM level into 50 Ω. (There is a 20 ns insertion delay from the signal input to the discriminator output.) Trigger Input Impedance 10 kΩ Threshold –2.000 V to +2.000 V in 1 mV steps Slope...

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TTL input, sampled each trigger. If high, causes the current record to be ignored (not accumulated) TTL input, sampled each trigger. If high, causes the current record to be subtracted from the accumulation (in external toggle mode). Ordering Information SR430 Multichannel scaler/averager with rack mount kit SR445A 350 MHz preamplifier O430H Carrying handle General Interfaces IEEE-488.2, RS-232, and Centronics printer interfaces are standard. All instrument functions can be controlled and read through the interfaces. Data transfer 16k bins in 500 ms Hardcopy Screen dumps to Epson compatible...

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