Hewlett Packard 8444A Generator
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The Model 8444A
is designed to complement
both Model 8554B
and Model 8555A
Sections. The Tracking Generator
covers the frequency range
of 500 kHz to 1250 MHz when used with the 8554 B RF Section
and from 10 MHz to 1.3 GHz when used with the 8555A
Section. The Tracking Generator/Spectrum Analyzer
as a system to perform frequency response measurements.
Additionally, the system can be used as a signal Generator
or sweeper to supply a test signal to other devices. An
auxilliary output is provided for precision frequency
measurements by an external frequency Counter
1-20. The Tracking Generator
converts the first and third
(LO) signals from the Spectrum Analyzer
Section, to a signal that tracks the frequency tuning of the
RF Section. With the Spectrum Analyzer
operating in ZERO
SCAN WIDTH, the Tracking Generator
is a CW signal Generator
tuned to the frequency of the Analyzer
. In FULL or PER
DIVISION SCAN WIDTH the Tracking Generator
functions as a
which tracks the Analyzer
Additionally, a MANUAL SCAN control on the Tracking
allows manual tuning of the Spectrum
System. The amplitude of the
output is adjustable over a 0 to —10 dBm
range by a front panel vernier control. The output level is
calibrated at 30 MHz to 0 ±0.5 dBm and maintained by an
automatic level control circuit. Refer to Table 1-1 for
system performance specifications.
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31 May 2015
This manual applies directly to instruments with serial
numbers prefixed 1323A.
With modifications described in Section VII, this manual
also applies to instruments with serial numbers prefixed
1033A, 1139A, 1147A, 1208A and 1215A.
This manual contains all information required to install,
operate, test, adjust and service the Hewlett-Packard Model
. This section covers instrument
identification, description, options, Accessories
specifications and other basic information.
1-3. Figure 1-1 shows the Hewlett-Packard Model 8444A
1-4. The various sections in this manual provide information
SECTION II, INSTALLATION, provides information relative to
incoming inspection, power requirements, mounting, packing
and shipping, etc.
SECTION III, OPERATION, provides information relative to
operating the instrument.
SECTION IV, PERFORMANCE TESTS, provides information required
to ascertain that the instrument is performing in accordance
with published specifications.
SECTION V, ADJUSTMENTS, provides information required to
properly adjust and align the instrument after repairs are made.
SECTION VI, REPLACEABLE PARTS, provides ordering information
for all replaceable parts and assemblies.
SECTION VII, MANUAL CHANGES, normally will contain no
relevant information in the original issue of a manual. This
section is reserved to provide back-dated and up-dated
information in manual revisions or reprints.
SECTION VIII, SERVICE, includes all in formation required to
service the instrument.