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113 Scintillation Preamplifier

ORTEC 113 Scintillation Preamplifier
  • Designed for photomultiplier tubes
  • Input capacitance switch for selectable sensitivity
  • Input protected
  • Economical

The ORTEC Model 113 Scintillation Preamplifier is designed for use with dynode or anode signals from photomultiplier tubes.
  • Literature +

  • More Information +

    The charge in the photomultiplier output pulse is integrated on the input capacitance of the preamplifier to produce a voltage pulse. A non-inverting voltage amplifier (gain ≈ 1 ) drives this pulse into the output load. Switch selection of the input capacity permits control of the sensitivity of the preamplifier. The input capacity of the Model 113 is ~45 pF plus the capacity selected by a front-panel switch (0, 100, 200, 500, or 1000 pF). 

    The Model 113 should be used with a shaping main amplifier, such as ORTEC Model 460, 570 Series, 671, 672, and 590A.

    A diode network prevents destruction of the input transistor if a sudden positive or negative high voltage is applied to the input.
  • Specifications +

    Rise Time <60 ns.
    Preamplifier Fall Time Fall time constant is designed for 50 µs, assuming a signal source impedance of 1 MΩ.
    Integral Nonlinearity ≤±0.02%.
    Temperature Coefficient ±0.01%/°C, 0 to 50°C.
    Counting Rate The gain shift of a 250-mV reference pulse is <0.25% with the application of an additional count rate of 65,000 counts/s of 200-mV random pulses.
    Noise <0.1 mV rms at output.

    Input Cap
    Switch selects desired input capacity: 0, 100, 200, 500, or 1000 pF.

    BNC connector; isolated for 1000 V; positive or negative polarity; input impedance is 45 pF plus the capacity selected by the front-panel switch (0, 100, 200, 500, or 1000 pF), shunted by the resistance needed to preserve a 50-µs decay time constant.
    Test BNC connector accepts a pulse generator output with fast rise and slow decay to check operation of the electronics; input impedance 100 Ω.
    Power Input power through captive power cable from ORTEC main amplifier or ORTEC Model 4002P Portable Power Supply.

    BNC connector; output impedance adjustable from 40 to 140 Ω. Output saturation level ±10 V into open circuit; ±5.1 V into 100-Ω load. Linear output ±7 V into open circuit; ±3.5 V into 100-Ω load.

    Electrical and Mechanical
    Power Required
    +24 V dc, 17 mA; –24 V dc, 17 mA.
    Weight Net  0.65 kg (1.5 lb).    Shipping  1.05 kg (2.3 lb).
    Dimensions 4.5 X 10.2 X 15.3 cm (1.75 X 4 X 6 in.).
  • Ordering Information +

    Model Description
    113 Scintillation Preamplifier
    Suggested Cable Accessories
    C-24-.5 RG-62A/U 93-Ohm Cable with two BNC male plugs; 6 in. length
    RG-62A/U 93-Ohm Cable with two BNC male plugs; 12-ft. length