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Model 415E
Section I
Paragraphs 1-1 to 1-7
SECTION
1
GENERAL
INFORMATION
1-1. INTRODUCTION.
1-2.
Тһе Model415E SWR Meter is a high-gainampli-
fier, tuned
to an audio frequency,
with a square-law
calibrated meter readout.
The Model 415E is designed
for use with square-law detectors inthe measurement
of SWR
and attenuation.
In addition, because
of the
high-sensitivity and tuned amplifier, it can be used as
a null detector for audiofrequency
bridges.
The Model
415E is shown in Figure 1-1. Operating Specifications
for the Model 415E are given in Table 1-1.
1-3.
The Model 415E
is a tuned audio amplifier de-
signed to operate at a mean center frequency of 1000 cps
(Hz), adjustable 7% with a variable bandwidth of from
15 to 130 cps (Hz). Operating center frequency andband-
width are both variable
at instrument
front
panel.
Tuned
amplifier gain is only slightly
changed
due to
any change inbandwidth andis typically less than0.5 db.
In addition to the front panel meter
readout provided
by the SWR
Meter, two rear panel outputs are also
available: An AC amplifier outputis provided to allow
using the 415E as a high-gain(126 db) tuned amplifier;
a DC recorder output providing a convenient means of
obtaining a permanent
record of measurement
data.
Either or both of these rear panel outputs can be used
without affecting instrument meter operation provided
power line ground
is not connected
to the instrument
through either rear panel connector.
1-4.
INSTRUMENTS
COVERED
ВУ
MANUAL.
1-5.
This manual applies directly to the Model 415E
SWR Meters having serial numbers prefixed 719 (first
Bie
02152-4
three numbers
of serial number).
If the serial prefix
on your instrument is other than 719, there are differ-
ences between the manual and your
instrument
which
are described in a Manual Changes sheet included with
the manual.
If the manual changes
sheet is missing,
the information canbe supplied by your nearest Hewlett-
Packard Sales and Service Office (see lists at the rear
of this manual).
The manual change sheet may
also
include
an" ERRATA" section which describes manual
correction information which applies tothe manual for
all instruments
including
instruments
prefixed
719,
1-6.
INSTRUMENT
OPTIONS.
1-7.
This manual provides
operating and servicing
information for the standard Model 415E.
In addition,
operating and servicing information
for Model 415E
instruments with Options 01 and/or 02, described be-
low, is also included.
a. Option 01:
Factory installed, 24-volt recharge-
able battery capable
of supplying up to 36 hours con-
tinuous operation of the Model 415E.
1f not initially
installed as an option, the same battery is available
on order from Hewlett-Packard (see Paragraph 2-17).
b. Option 02:
Additional
input connector on rear
panel wired in parallel with the front panel INPUT con-
песіог.
If not initially installed as an option, the con-
nector-cable
assembly
is available
on order
from
Hewlett-Packard (see Paragraph 2-17).
1-1
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