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Preamplifier
SR240A — 350 MHz preamplifier

  • 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

 

 

 

 

 


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 ast rise time, low noise, and DC accuracy of the SR240A make it the ideal instrument for use with photomultiplier tubes and photodiodes.

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.

Specifications
General
Amplifier channels 4
Inputs & outputs 50 Ω DC coupled
Bandwidth DC to 350 MHz (-3 dB)
Rise/fall time 1 ns (single channel)
Voltage gain 5 per channel. Up to 4 channels can be cascaded.
Input noise 6.4 nV/√Hz
Operating range Inputs: ±200 mV, Outputs: ±1.0 V
Propagation delay 2.7 ns per channel
Recovery time 3 ns for a 10× overload
Input protection ±50 V for <1 µs
Output clamp ±1.6 V

Output overload detect

 ±1.3 V
Crosstalk -60 dB
Operation temperature 0 °C to 40 °C, non-condensing
Mechanical Single-width NIM module
Warranty One year parts and labor on defects in materials and workmanship
   



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Phone: (408) 744-9040 • Fax: (408) 744-9049 • email: info@thinkSRS.com • www.thinkSRS.com
© Stanford Research Systems, Inc. 2003