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Model 7414A
SECTION I
GENERAL INFORMATION
Section I
General Information
1-1. INTRODUCTION.
1-2. This manual contains installation, operating, and main-
tenance instructions for your Hewlett-Packard Model
7414A Recording System, which has four channels, and
produces four recorded traces with heated styli on heat-
sensitive chart paper Permapaper.® Other manuals, for use
with the 8800-Series Preamplifiers, and for other equip-
ment ordered with the 7414A System are provided sepa-
rately since a variety of preamplifiers, scopes, tape re-
corders, computer terminals and control units may be used
with the recording system.
1-3. FOUR-CHANNEL RECORDER.
1-4. The Model 7414A Recorder (Figure 1-1) at the core
of the system, is supplied mounted in a benchtop enclosure.
It is optionally available mounted in a mobile cart, or
unenclosed, for mounting in an existing equipment rack.
1-5. The Recorder houses up to four Hewlett-Packard 8800
Series Preamplifiers and supplies them with operating
power and signal connections. The preamplifiers, selected
for each channel and ordered separately, are installed and
tested with the recorder at the factory. It is easy to change
the function of any channel by loosening two front panel
thumbscrews and replacing the preamplifier with a different
model.
1-6. The Model 7414A Recording System records signals
monitored from devices, processes, or transducers. To
monitor a signal, connect the signal cable to the input
connector for the assigned channel on the recorder rear
panel. The rear panel inputs are connected to signal condi-
tioning preamplifiers mounted in the recorder. Each pre-
amplifier output is applied to a power amplifier that drives
one recording stylus. From the preamplifier output on, all
four channels are identical. For ease of maintenance, all
electrical adjustments are accessible from the front or top
of the recorder, and most assemblies can be removed with
the recorder mounted in the enclosure, mobile cart, or
equipment rack.
1-7. The recorder uses Z-fold chart paper for convenient
access to any part of the recording. The folded paper
permits rapid scanning of the record
to
assess response
trends. All pages are numbered to allow insertion in a
notebook, or the complete record may be filed in the
original flat box (pages are 8 x 12 inches, 20 x 30 cm,
approximately). A new pack of chart paper can be loaded
quickly, in less than ten seconds, to minimize loss of
recording continuity.
07414-1
1-8. The recorder may be remotely controlled to mark
events, start, or go on standby. Two event markers are
provided; one permits the user to indicate the start and
finish of an event, the second provides time interval
marking in minutes or seconds.
1-9. Applications and Specifications.
1-10. A wide selection of transducers and Hewlett-Packard
preamplifiers are available for research, laboratory, and
industrial applications. The following list gives some typical
applications where data can be measured, monitored, and
recorded using the recorder and Hewlett-Packard preampli-
fiers:
Engine Testing
Aircraft, Missile, and Space Flight Analysis
Seismographic Studies
Environmental Pollution Monitoring
Telemetry Systems
Production Control
Relative Displacement and Velocity Monitoring
1-11. Hewlett-Packard will be glad to cooperate in the
selection of transducers and preamplifiers for any particular
measurement, and to send you information as additional
instrumen ts are developed to provide your recording system
with other capabilities. For help in expanding your system,
con tact the field engineer at any Hewlett-Packard Sales/
Service Office listed in the back of this manual.
1-12. Table 1-1 gives the specifications for the Model
7754A Recorder, a part of the Model 7414A Thermal Tip
Recording System, and Table 1-2 lists the recorder options
available. Preamplifier specifications will be found in the
separate preamplifier manuals. Preamplifier frequency
response and rise time must be modified by the frequency
response and rise time specifications given for the recorder.
Recording quality is improved by the recorder's low level of
hysteresis distortion. Minor waveform details are not
obscured by recorder-contributed distortion.
1-13. 8800 Series Preamplifiers (7414A System).
1-14. The 7414A Recording System is factory assembled
for use with the solid-state 8800 Series Preamplifiers
(Figure 1-2). They plug in interchangeably from the front
of the recorder. Signal connections are made at the rear,
but signals can be monitored from the front of the
preamplifiers. The general characteristics of each preampli-
fier are given in the following paragraphs. For complete
information see the preamplifier instruction manual.
1-1
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