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426 Linear Gate

ORTEC 426 Linear Gate
  • For passing and blocking analog signals in the range from +0.2 to +10 V
  • Ungated or gated with coincidence or anticoincidence gating
  • External or internal control of gate pulse width

The ORTEC Model 426 Linear Gate provides a variable gate duration with width controlled by a single-turn front-panel-mounted potentiometer.
  • Literature +

  • More Information +

    The nominal gate duration is from 0.3 to 4 µs. Operation of the linear gate is controlled by a positive enable pulse. It is useful for selecting or inhibiting linear signals according to chosen coincidence or timing requirements.

    The ORTEC Model 426 has two operating modes: all input signals not accompanied by an enable pulse are blocked or all signals are passed unless accompanied by an inhibit signal. The inhibit signal can be fed into the front- panel Enable connector for Pulse Inhibit operation or into the DC Inhibit connector for dc or continuous inhibit operation. The DC Inhibit mode provides external control of the gating period.
  • Specifications +

    Integral Nonlinearity <±0.15% from 0.2 to 10 V.
    Pulse Feedthrough <10 mV with a 10-V input pulse.
    Temperature Instability <±0.015%/°C, 0 to 50°C.
    Counting Rate The gain shift of a 4-V reference pulse is <0.25% with the application of an additional count rate of 65,000 counts/s of 6-V random pulses.


    Gate Width Continuously variable from 0.3 to 4 µs.
    Output Pedestal Adjustable to <1 mV.
    Pulse Inhibit/
    DC Inhibit
    3-position mode switch permits selection of the function of any pulse or dc level furnished through the front-panel Enable Input connector, or the rear-panel DC Inhibit connector.
    • Norm  Input pulse will be gated through to the output during a gate width interval following the leading edge of each Enable Input pulse.
    • Pulse Inhibit  Input pulses will be inhibited from passing through the output during a gate width interval following each Enable Input pulse.
    • DC Inhibit  Input pulses will be inhibited from passing through the output during intervals of pulses or dc levels through the rear-panel DC Inhibit connector.


    Unipolar or bipolar with positive portion leading. Rated range 0.2 to 10 V, 12 V maximum. Input impedance >5000 Ω; BNC connector. Input is ac-coupled with a passive symmetric baseline restorer. BLR can be bypassed for dc-coupling.
    Enable or Inhibit Input Any positive input >2 V, maximum input 20 V. Enable impedance 1000 Ω, dc-coupled; Inhibit impedance 650 Ω, dc-coupled; BNC connector for each.

    Rated output range 0.2 to 10 V positive; 12 V maximum. Output impedance ~2 Ω, dc-coupled, short-circuit protected; BNC connector.

    Electrical and Mechanical
    Power Required
    The Model 426 derives its power from a standard NIM bin/power supply. The power required is +24 V, 30 mA; –24 V, 49 mA; +12 V, 16 mA; –12 V, 4.9 mA.
    Weight Net  0.96 kg (2.1 lb)   Shipping  1.82 kg (4.0 lb).
    Dimensions NIM-standard single-width module 3.43 X 22.13 cm (1.35 X 8.714 in.) per DOE/ER-0457T.
  • Ordering Information +

    Model Description
    426 Linear Gate