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 avariety
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
amobile 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 adifferent
model.
1-6. The Model
7414A
Recording System records signals
monitored from devices, processes, or transducers. To
monitor
asignal, 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 apower 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). Anew 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. Awide 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
instruments are developed
to
provide
your
recording system
with
other
capabilities.
For
help in expanding
your
system,
contact 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
