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Model 415E
Section I
Paragraphs 1-1 to 1-7
SECTION 1
GENERAL INFORMATION
1-1. INTRODUCTION.
1-2. The Model 415E SWR Meter is a high-gain ampli¬
fier, tuned to an audio frequency, with a square-law
calibrated meter readout. The Model 415E is designed
for use with square-law detectors in the measurement
of SWR and attenuation.
In addition, because of the
high-sensitivity and tuned amplifier, it can be used as
a null detector for audio frequency 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 and band¬
width are both variable at instrument front panel.
Tuned amplifier gain is only slightly changed due to
any change in bandwidth and is typically less than 0.5 ab.
In addition to the front panel meter readout provided
by the SWR Meter, two rear panel outputs are also
available: An AC amplifier output is 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 BY MANUAL.
1-5. This manual applies directly to the Model 415E
SWR Meters having serial numbers prefixed 719 (first
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 can be 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 to the 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.
If 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¬
nector. If not initially installed as an option, the con¬
nector - cable assembly is available on order from
Hewlett-Packard (see Paragraph 2-17).
02152-4
1-1
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