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INTRODUCTION
INTRODUCTION
1.1
PURPOSE.
The Type 1398-A P u l s e Generator i s a gen-
eral-purpose pulse source intended primarily for labora-
tory use. The repetition r a t e s of the pulses may be
either internally controlled, a t frequencies from 2.5 c / s
t o 1.2 Mc/s, or externally controlled a t frequencies up
to 2.4 Mc/s.
In addition t o the main positive and negative out-
put p u l s e s , the instrument a l s o supplies synchronizing
pulses that correspond t o the beginning and end of t h e
main pulse. The early sync pulse
(
prepulse ) i s intended
chiefly for synchronizing a n o s c i l ~ o s c o p e while the l a t e
pulse ( d e l a y pulse
)
i s intended t o make the instrument
an accurate time-delay generator.
1.2 GENERAL DESCRIPTION.
The Type 1398-A comprises three main circuit
groups:
(1) A combination input circuit and oscillator that
establishes the repetition rate of the main pulse.
(2) A combination pulse-timing and output circuit
that establishes the duration and amplitude of the
main pulse.
(3) A power supply that provides regulated voltage
for the other two circuit groups.
The repetition frequency, duration, and amplitude
of the main output pulse are adjustable by front-panel
controls. T h e instrument, which is housed in a convert-
ible-bench cabinet, may be used a s supplied a s a
bench instrument or may be quickly and e a s i l y adapted
for use in a relay-rack. (Refer t o paragraph 2.3.)
1.3 CONTROLS AND CONNECTORS.
See Figure 1-1 and Table 1-1 for the location and
the description of the controls and connectors used on
the Type 1398-A.
1.4 ACCESSORIES SUPPLIED.
One instruction book,form number 1398-0100.
One power cord, part number 4200-9622.
1.5 ACCESSORIES AVAILABLE.
Type 12 17-P2 Single-Pulse Trigger, catalog number
1217-9602. Used t o generate single pulses. S e e Figure
1-2 and paragraph 3.11.4 for further details.
Type 480-P312 Relay-Rack Adaptor Set, catalog
number 0480-9632. Used t o rack-mount the Type 1398-A.
Refer to paragraph 2.3 for further details.
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