Stanford Research SR400 Dual-Channel Gated Photon Counter
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Stanford Research SR400 Dual-Channel Gated Photon Counter


  • Two Independent Counting Channels
  • Count Rates to 200 MHz
  • 5 ns Pulse-Pair Resolution
  • Gated and Continuous Modes
  • Built-In Discriminators
  • Gate and Discriminator Outputs

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  • Description
  • Tech Specs
  • Datasheets / Manuals 
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The SR400 Dual-Channel Gated Photon Counter offers a convenient, integrated approach to photon counting that avoids the complexity and expense of older counting systems. No longer is it necessary to mix and match amplifiers, discriminators, gate generators and counters. The SR400 combines all these modules into a single, integrated, microprocessor-controlled instrument. Complex measurement tasks such as background subtraction, synchronous detection, source compensation, and pile-up correction can all be performed easily with the SR400. The SR400 has two independent channels that can count at rates up to 200 MHz. Different counting modes allow you to count for a fixed amount of time, until a certain number of counts have been received, or for a fixed number of triggers. Each counting channel has its own gate generator which provides counting gates as short as 5 ns or as long as 1s. The gates can be set in a fixed position relative to the trigger signal, or scanned to measure lifetimes or recover time-varying waveforms.

Product Family: SR400
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Manuals, Datasheets, Drivers, Links

Stanford Research SR400 Datasheet (pdf) 
Stanford Research SR400 Manual (pdf) 
Link to Stanford Research Website