SR400 Dual Channel Gated Photon Counter0 pages

Photon Counters
SR400 — Gated photon counter (2-channel)

SR400 Gated Photon Counter
The SR400 Dual-Channel Gated Photon Counter offers a
convenient, integrated approach to photon counting that
avoids the complexity and expense of older counting systems.
No longer is it necessary to mix and match amplifiers,
discriminators, gate generators and counters. The SR400
combines all these modules into a single, integrated,
microprocessor-controlled instrument. Complex measurement
tasks such as background subtraction, synchronous detection,
source compensation, and pile-up correction can all be
performed easily with the SR400.

· Two independent counting channels
· Count rates to 200 MHz
· 5 ns pulse-pair resolution
· Gated and continuous modes
· Gate scanning for time-resolved
counting

Counters

· Built-in discriminators

The SR400 has two independent channels that can count at
rates up to 200 MHz. Different counting modes allow you to
count for a fixed amount of time, until a certain number of
counts have been received, or for a fixed number of triggers.
Each counting channel has its own gate generator which
provides counting gates as short as 5 ns or as long as 1 s.
The gates can be set in a fixed position relative to the trigger
signal, or scanned to measure lifetimes or recover timevarying waveforms.

· Gate and discriminator outputs
· GPIB and RS-232 interfaces

The actual inputs to the counters can be viewed as NIM level
pulses from the discriminator outputs on the front panel. The
discriminated pulses are negative going from 0 to –0.7 V. The
DISC outputs are very useful when adjusting discriminator
thresholds or gate timing.

· SR400 ... $5350 (U.S. list)

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