Datapulse 101 - General Information

SECTION II
OPERATING INSTRUCTIONS
Z. 1 GENERAL INFORMATION
The basic capabilities of the Model 101 Pulse Generator satisfy a
broad range of pulse test requirements. These consist of repetition rates
to 10 MHz, single or double pulse mode operation, 5 nanosecond rise time,
i10 volt output amplitudes, i250 millivolt trigger sensitivity and variable
pulse width and delay to 10 milliseconds. Flexible external gating and
triggering with countdown capability extends this usefulness, and 100021
coverage on delay and width timing control ranges provides extra convenience
of operation
The external gating capability makes synchronous, asynchronous or
coincidence gating possible. In the synchronous gate mode, the output pulse
train is synchronous with the leading edge of an externally applied gate wave-
form with negligible difference in the pulse waveform between the first and
last pulse in the gated burst.
In the asynchronous mode, the output pulse train is normally off while
the oscillator continuously provides advanced trigger outputs. Application
of an external gating signal enables the pulse outputcircuitry, beginning with
the first advanced trigger after the gate is applied and continuing until the
gate is removed. The reference trigger output is available during the pulse
train.
Coincidence gating is achieved by application of a gate pulse at the
gating input and a trigger source at the external trigger input. The 101
produces a pulse whenever the two are coincident.
The external trigger circuit utilizes slope level and polarity controls
and provides sensitivity of 250 millivolts for oscilloscope type triggering.
Synchronous countdown of external trigger is useful in applications
requiring frequency division. With the delay set greater than the period of
an external trigger, the output pulse rate is a subharmonic of the trigger
rate, counted down by a factor set by the delay control. Similar operation
may be secured by using the internal oscillator. The advanced trigger out—
put
occurs
at
the
oscillator
rate
and
the
reference
trigger
and
pulse
outputs
occur at the subharmonic rate.
The
repetition
rate
selector
switch
permits
the
unit
to
be
triggered
from
any
point
on
the
positive
or
negative
slope
of
the
ac
line
voltage
wave—
form. This may be applied to power control circuity design using SCR's
thyratrons, etc.