SR240A 350 MHz Preamplifier0 pages

Gated Integrators and Boxcar Averagers
SR240A — 350 MHz preamplifier (4-channel)

· Four independent channels
· DC to 350 MHz bandwidth
· 1 ns rise and fall time
· Voltage gain to 625
· 6.4 nV/√Hz input noise
· 50 Ω input and output impedance
· 3 ns overload recovery
· Excellent phase linearity

· SR240A ... $1000 (U.S. list)

SR240A 350 MHz Preamplifier
The model SR240A 350 MHz Preamplifier is a 4-channel,
DC-coupled instrument with a gain of 5 per channel. The
amplifiers can be used independently or cascaded to provide
gains of 5, 25, 125 or 625. The fast rise time, low noise, and
DC accuracy of the SR240A make it the ideal instrument for
use with photomultiplier tubes and photodiodes.

SR240A Specifications
Amplifier channelst
4
Inputs and outputst
50 Ω, DC coupled tt
Bandwidtht
DC to 350 MHz (–3 dB)
Rise/fall timet
1 ns (single channel)
Voltage gaint
5 per channel. Up to 4 channels can t
tt
be cascaded.
Input noiset
6.4 nV/√Hz
Operating ranget
Inputs: ±200 mV, Outputs: ±1.0 V
Propagation delayt
2.7 ns per channel
Recovery timet
3 ns for a 10× overload
Input protectiont
±50 V for <1 µs
Output clampt
±1.6 V
Output overload detectt ±1.3 V
Crosstalkt–60 dB
Operating temperaturet 0 °C to 40 °C, non-condensing
Mechanicalt
Single-width NIM module
Warrantyt
One year parts and labor on defects
tt
in materials and workmanship

The SR240A preamp is useful for amplifying small signals to
levels that can be processed by other boxcar system modules.
Typically, a signal of at least a few millivolts is required at the
input of the SR250. If your detector does not supply this signal
level, the SR240A can be used in front of the SR250 to ensure
sufficient signal amplitude.

Ordering Information

SR240At350 MHz preamplifier, 4 ch.t

Stanford Research Systemstt
tttt

$1000

phone: (408)744-9040
www.thinkSRS.com