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Model 204B
Section I
Paragraphs 1-1 t o 1-11
I'
S E C T I O N I
G E N E R A L I N F O R M A T I O N
1 - 1 .
I N T R O D U C T I O N .
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 t o 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, a l s o battery-powered,
makes an ideal companion instrument f o r the Model
204B.
1 - 4 .
POWER SUPPLY.
1-5. Normally the oscillator
is equipped with a bat-
t e r y 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 r e -
chargeable batteries (Option 2) may be used. Both
of these power supplies operate from 115
or 230 volts,
and a r e in kit form for field installation. Thebattery
pack is a l s o in kit form. All t h r e e types of power
supplies mount in the s a m e location in the instrument
and can be easily interchanged in the field.
1 - 6 . MERCURY A N D RECHARGEABLE
BATTERIES.
1-7. Mercury batteries used in the Battery P a c k a r e
vented t o prevent excessive internal p r e s s u r e s from
Table 1-1.
SI
FREQUENCY RANGE: 5 cps t o 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 v r m s 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 t o
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 . O P T I O N S AVAILABLE.
1-9. The following t h r e e power supplies a r e 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 I D E N T I F I C A T I O N
1-11. Hewlett-Packard used a two-section,
eight-
digit s e r i a l number
(000-00000).
If the
first
t h r e e
digits of the serial number on your instrument do not
a g r e e 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.
x i f icat ions
DISTORTION: L e s s than 1%
NOISE: Less than 0.05%, a c
or
battery operated
POWER SOURCE: 4 batteries
at
6 . 7 5 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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