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SR445A 350 MHz Preamplifier0 pages
350 MHz Preamplifier
SR445A — 350 MHz preamplifier (4-channel)
The Model SR445A 350 MHz Preamplifier contains four
wide-bandwidth, DC-coupled amplifiers, each with a gain
of 5. The four channels may be used independently, or
cascaded to provide a total gain of up to 625. The fast rise
time, low noise, and excellent DC accuracy of the SR445A
make it an ideal instrument for amplifying the outputs of fast
photomultiplier tubes and photodiodes. The SR445A can
be used to improve the sensitivity of oscilloscopes, photon
counters, boxcar averagers, spectrum analyzers, and other
high-frequency test equipment.
Each channel has an input and output impedance of 50 Ω.
The input impedance of channel one can be increased to
approximately 500 Ω by a front-panel switch. This can
improve the sensitivity of signals from current and charge
output devices, such as photomultiplier tubes. Each channel
has a separate offset adjustment allowing you to quickly null
DC errors.
SR445A 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
tt
(Up to 4 channels can 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
Dimensionst8.3" × 1.5" × 8" (WHD)
Powert10 W, 100/120/220/240 VAC,
tt
50/60 Hz
Warrantyt
One year parts and labor on defects
tt
in materials and workmanship
· 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
Ordering Information
· SR445A ... $1200 (U.S. list)
Stanford Research Systemstt
tttt
SR445A t
350 MHz preamplifiert
$1200
phone: (408)744-9040
www.thinkSRS.com
