794 QUAD GATE/DELAY GENERATOR

说明书 794

FEATURES

  • Four Independent Gate/Delay Channels
  • Wide Range, 50 nSec to over 10 Seconds
  • NIM, TTL Inputs; NIM, TTL, ECL Outputs
  • Deadtimeless Operation
  • Set/Reset Flip-Flop Mode
  • Remote Programming via a 0 Volt to 10 Volt Input
  • Easily Configured as an Oscillator or a Pulser
  • Provides Bin Gate for Host NIMBIN

A bright LED indicates an active gate condition. Versatile input and output structures provide compatibility with NIM, ECL, and TTL standards.

Further flexibility is afforded by programming jumpers mounted on the printed circuit board. These jumpers allow selected inputs and outputs to be assigned alternate logic functions or polarities.

The model 794 time-base circuit is non-updating and exhibits essentially no deadtime. The DELAY output always occurs at the trailing edge of the GATE output and it's output width may be adjusted by a front panel potentiometer.

INPUT CHARACTERISTICS

  • Trigger
    • LEMO style connector;
    • 1 K ohm impedance for positive TTL logic levels;
    • 50 ohm for negative NIM logic;
    • Positive LOGIC 0: less than +0.5 Volt; LOGIC 1: greater than +1.5 Volt.
    • Negative NIM logic levels; LOGIC 0: less than ±1mA, (±50mV), LOGIC 1: --14mA, (--700mVolt).
  • OR
    • LEMO style connector; Negative NIM level input, LOGIC 0 = ±50mVolts, LOGIC 1 = --700mVolts.
    • A jumper allows selection of 50 ohm or 1 K ohm input impedance;
    • "OR is shipped as high impedance input OR".
  • Inhibit
    • LEMO style connector;
    • Negative NIM input levels; 50 ohm impedance.
    • Forces all outputs to their quiescent state.
  • Reset
    • LEMO style connector;
    • Negative NIM input levels; 50 ohms;
    • Enabled only in bistable mode.
  • Analog Remote Programming
    • Isolated ground LEMO style connector; High impedance, differentially received; An external analog input allows remote programming from 5% to 105% of selected range with 0 to +10 Volt input.
    • Maximum input voltage: Differential = --6 Volt to +12 Volts. Common Mode = ±6 Volts.
    • Recommended Input Voltage: Differential = 0 to +10.0 Volts. Common Mode = ±0.5 Volt.

Propagation Delay

  • TRIGGER to:
    • GATE = 11 nSec max.
    • TTL = 20 nSec max.
    • ECL = 11nSec max.
  • RESET to:
    • GATE = 11nSec max.
    • TTL = 20nSec max.
    • ECL = 11nSec max.
  • OR to:
    • GATE = 8nSec max.
    • TTL = 15nSec max.
    • ECL = 8nSec max.
  • INHIBIT to:
    • GATE = 6nSec max.
    • TTL = 15nSec max.
    • ECL = 8nSec max.

OUTPUT CHARACTERISTICS

  • Gate
    • Negative NIM current source output; --16mA, (--800mV into 50 ohms). Output duration equals the RANGE SWITCH setting in conjunction with the GATE WIDTH control setting.
  • complemented Gate
    • Negative NIM current source output; The complement of GATE output.
  • Delay
    • Negative NIM output pulse; Begins at the trailing edge of GATE output; Width is adjustable from 10nSec to 100nSec.
  • TTL
    • A TTL logic level output; Capable of driving a single 50 ohm load or up to 60 standard TTL inputs.
    • LOGICAL 1 = 2.7 Volt min. @ 45mA max; LOGIC 0 = 0.5 Volt max. @ --100mA max; The TTL output can be jumper selected to be GATE, DELAY or their complements.
    • "TTL is shipped as GATE".
  • ECL Outputs
    • ECL is a two pin header; 0.025" posts on 0.1" centers. Output is a differential 100 ohm line driver.
    • Jumper selected to be GATE, DELAY or their complements.
    • ECL + : Quiescently LOGIC 0 = --1.7 Volt typ. LOGIC 1 = --0.90 Volt typ.
    • ECL - : Quiescently LOGIC 0 = --0.90 Volt typ. LOGIC 1 = --1.7 Volt typ.
    • "ECL is shipped as GATE".

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