SR715 and SR720 — 100 kHz LCR meters

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.



SR445A Specifications

Amplifier channels 4
Inputs and 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 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