Model 204B
Section I
Paragraphs
1-1
to
1-11
I'
SECTION
I
GENERAL INFORMATION
1-1.
INTRODUCTION.
1-2. The Model 204B Oscillator (figure 1-1)
is
a
transistorized battery-powered instrument which
pro-
duces sine-wave signals
in
the 5-cps to 560-kc range.
The output
is
10 milliwatts into 600 ohms and
is
con-
tinuously adjustable over
at
least
a
40-db range. Into
the rated load of
600
ohms, frequency response
is
within &3%. The oscillator output
is
floating, isolated
from power line ground and instrument chassis.
1-3. The 600-ohm output impedance of the oscillator
makes it compatible with transmission lines and many
distribution systems. When battery-powered, the
oscillator
is
useful for isolated applications. The
@
Model 403A/B AC Voltmeter, also battery-powered,
makes an ideal companion instrument for the Model
204B.
1-4.
POWER SUPPLY.
1-5. Normally the oscillator
is
equipped with
a
bat-
tery pack which consists of four 6.75-volt mercury
batteries.
If
operation from AC
is
desired, an AC
power supply (Option
1)
or
a
power supply with re-
chargeable batteries (Option 2) may be used. Both
of these power supplies operate from 115
or
230 volts,
and are
in
kit form for field installation. Thebattery
pack
is
also in kit form. All three types of power
supplies mount in the same location in
the
instrument
and can be easily interchanged in the field.
1-6.
MERCURY AND RECHARGEABLE
BATTERIES.
1-7.
Mercury batteries used in the Battery Pack are
vented to prevent excessive internal pressures from
Table
1-1.
SI
FREQUENCY RANGE: 5 cps to 560 kc in
5
ranges,
vernier control
DIAL ACCURACY: *3%
FREQUENCY RESPONSE: *3%, with rated load
OUTPUT IMPEDANCE: 600 ohms
OUTPUT: 10 milliwatts (2.5 vrms) into 600 ohms,
5 vrms open circuit, completely floating
OUTPUT CONTROL: Continuously variable bridged
"TtT attenuator with
at
least
40-db range
developing. The nickel
cadmium batteries
are
seal-
ed butpresent no problem ifproperly used (see Section
111).
The following precautions should be followed for
either type of battery:
a.
DO NOT short circuit either type of battery.
b. Dispose of batteries promptly when they have
exhausted
or
will not operate equipment up to
specifications.
c. Never dispose of batteries by
fire.
d. Turn off battery powered equipment when not
in use.
e.
Store batteries in
a
cool well-ventilated place.
1-8.
OPTIONS AVAILABLE.
1-9. The following three power supplies are avail-
able in kit form for field installation:
Battery Pack Power Supply
-
204B-64B
AC Operated Power Supply
-
204B-llA
Rechargeable Battery Power Supply
-
204B-11C
1-10.
INSTRUMENT IDENTIFICATION
1-11.
Hewlett-Packard used
a
two-section, eight-
digit serial number
(000-00000).
If
the
first
three
digits of the
serial
number on your instrument do not
agree with those on the title page of this manual,
change sheets supplied with the manual will define
differences between your instrument and the Model
204B described in this manual.
xif
icat ions
DISTORTION: Less than
1%
NOISE: Less than 0.05%, ac
or
battery operated
POWER SOURCE: 4 batteries
at
6.75 volts each,
7-ma drain, life at least 300 hours.
DIMENSIONS: Module 6-3/32 in. high, 5-1/8 in.
wide, 8
in.
deep
NET WEIGHT:
6
lb
EQUIPMENT AVAILABLE: 204B-llA, AC Supply
Kit for field installation, 204B-llC Recharge-
able Battery Supply Kit for field installation,
204B-64B, Battery Kit for field installation.
01369-4
1-1
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