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