SRS
SR445A – 350 MHz preamplifier
Overview
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.
Feature
• 4 independent channels
• DC to 350 MHz bandwidth
• 1 ns rise/fall time
• 6.4 nV/√Hz input noise
• Voltage gain to 625
• 50 Ω input and output impedance
• 3 ns overload recovery
Technical Specifications
General
Amplifier channels: 4
Inputs and outputs: 50 ? (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 ms
Output clamp: ?1.6 V
Output overload detect: ?1.3 V
Crosstalk: -60 dB
Operating temperature: 0 ?C to 40 ?C, non-condensing
Dimensions: 8.3″” ? 1.5″” ? 8.0″” (WHL)
Power: 10 W, 100/120/220/240 VAC, 50/60 Hz
Warranty: One year parts and labor on defects in materials and workmanship
Others
N/A
