srs SR400-Gated photon counter （2 ch.）

srs SR400-Gated photon counter (2 ch.)

主要指标与说明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.

SR400 Gated Photon CounterTwo independent channelsCount rates to 200 MHz5 ns pulse-pair resolutionGated and continuous modesGate scanningBuilt-in discriminatorsGate and discriminator outputsGPIB and RS-232 interfacesSR400 Gated Photon CounterThe 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.CountersThe 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 providing counting gates as short as 5 ns or as long as 1 s. The gates can be set in a fixed position relative to the trigger signal, or scanned to measure lifetimes or recover time-varying waveforms.The actual inputs to the counters can be viewed as NIM level pulses from the discriminator outputs on the front panel. The discriminated pulses are negative going from 0 to -0.7 V. The DISC outputs are very useful when adjusting discriminator thresholds or gate timing.Signal Inputs and DiscriminatorsBoth analog signal inputs (A and B) are internally terminated into 50 Ω. The inputs accept signals between ±300 mV and are protected to ±5 VDC. Each input is followed by a DC to 300 MHz amplifier, allowing detection of pulses as small as 10 mV. If additional sensitivity is required, a remote preamplifier (like the SR445A) can be used.Discriminators are provided for each channel with a selectable threshold from -300 mV to +300 mV in 0.2 mV steps. Pulse-pair resolution is 5 ns, and pulses of either polarity may be detected. Each threshold may be programmed to scan in either direction with selectable step size. This can provide a pulse height analysis (PHA) output and is useful for choosing photomultiplier tube bias or discriminator levels.Count PeriodsThe SR400 may be programmed to cycle from 1 to 2000 count periods in a single scan. At the end of the programmed scan, the counters may be stopped or the scan may be restarted. Consecutive count periods are separated by a "Dwell Time" which can be set from 2 ms to 60 s. During the Dwell Time, counting is disabled and data may be transferred or external parameters may be changed. The dwell output provides a TTL signal which is high during the dwell time. This can be convenient for interfacing other instruments used in the experiment.

OutputsThe front panel can display counts up to 109. Results from both counters can be displayed individually or combined as A-B or A+B. A front-panel D/A output provides an analog signal proportional to A, B, A-B, or A+B, depending on the counting mode. The scale may be logarithmic (1V/decade) or linear.Computer InterfacesBuilt-in RS-232 and GPIB interfaces provide a convenient means of controlling the instrument and retrieving data. While the SR400 is scanning, each of the count values for the A and B counters are stored in a 2000 point internal buffer. This buffer can be transferred on a point-by-point basis, or dumped all at once through either interface.SR400 Gated Photon CounterSignal Inputs Bandwidth DC to 300 MHzInput impedance 50 ΩLinear range ±300 mV (at input)Input protection ±5 VDC, 50 V for 1 μsOverload recovery 5 ns DiscriminatorsCounters A, B, and T have independent discriminators when counting the signal inputs. All discriminator levels may be set to a fixed level or scanned. Discriminator range -300 mV to +300 mVDiscriminator slope Rising or fallingResolution 0.2 mVInput offset voltage <1 mVMinimum pulse input 10 mVPulse-pair resolution 5 nsDISC outputs NIM levels into 50 ΩInhibit input TTL high stops countTrigger Input Impedance 10 kΩThreshold ±2.000 VDC in 1 mV stepsSlope Rising or fallingProtection 15 VDC, 100 V for 1 μsGate GeneratorsBoth the A and B gates may be fixed in time or scanned. The gate outputs show the positions of the gates with respect to the discriminator outputs. Insertion delay 25 nsMaximum delay 999.2 msMinimum gate width 5 nsMaximum gate width 999 ms or CWResolution 0.1 %, 1 ns minimumAccuracy 2 ns + 1 %Jitter 200 ps rms +100 ppmMaximum trigger rate 1 MHzGATE view output NIM levels into 50 ΩGATE view error <2 ns

Scan and DwellThe number of count periods or data points in a scan may be set from 1 to 2000. The duration of one count period is determined by the preset condition.The time between consecutive count periods is the dwell time and can be set from 2 ms to 60 s. The dwell output will be TTL high during the dwell time. This output can be used to trigger external devices. At the end of a scan (of 1 to 2000 count periods), counting may be programmed to stop or start the scan over again. The start key begins the first count period of the programmed scan.The stop key terminates the current count period and pauses the scan. If scanning, gates and disc levels are held at their current values. Pressing the stop key while in a paused condition will reset the scan, and all scanned parameters will return to their start values. Pressing the start key while paused resumes the scan by starting the next count period.The dwell time may also be set to external. In this mode, count periods begin with the start key or external start input (TTL rising edge). Count periods terminate with the preset condition, the stop key, or the external stop input (TTL rising edge). Pressing the stop key while not counting resets the scan.All count data is internally buffered for one scan. Data may be read over the computer interfaces during or after a scan.Display ModeContinuous Displays current counter valueHold Displays final count valueD/A OutputThe front-panel D/A output is proportional (linear or log) to A, B, A-B or A+B, and is updated at the end of each count period. There are two rear-panel D/A outputs: port 1 and port 2. These outputs may be set or scanned from the front panel or via the computer interface. Full scale ±10 VDCResolution 12 bits (5 mV)Current rating 10 mAOutput impedance <1 ΩAccuracy 0.1 % + 5 mVGeneralInterfaces GPIB and RS-232Dimensions 16" × 3.5" ×13" (WHL)Weight 10 lbs.Power 35 W, 100/120/220/240 VAC, 50/60 HzWarranty One year parts and labor on defects in materials and workmanship

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