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AUDIO OSCILLATORS
AUDIO SIGNAL
GENERATORS
VACUUM TUBE
VOLTMETERS
UHF SIGNAL GENERATORS
FREQUENCY STANDARDS
SQUARE WAVE
GENERATORS
WAVE ANALYZERS
DISTORTION ANALYZERS
AMPLIFIERS
ATTENUATORS
ELECTRONIC
FREQUENCY METERS
FM BROADCAST
MONITORS
REGULATED
POWER SUPPLIES
ELECTRON IC
TACHOMETERS
CATALOG
19-A
laboratory instruments
F O R S P E E D A N D A C C U R A C Y
HEWLETT-PACKARD COMPANY
395 PAGE MILL R O A D PALO ALTO, C A L I F O R N I A
INDEX
A complete, easy-to-use index of all -hp- in-
struments will be found inside this cover flap.
This quick-reference index lists -hp- instru-
ments by function and model number, and
gives brief data on frequency range and other
characteristics.
CATALOG 19-A
HEWLETT- PACKARD COMPANY
395 PAGE MILL ROAD*PALO ALT0, CALIFORNIA
FREQUENCY CHARACTERISTICS PAGES
10 Binding Post 33
HARDWARE-':
Flexible coupler, ceramic insulated; permits mis-
14 alignment of 1/32" and/or 5' 33
100A 100 kc, 10 kc, 1 kc, 100 cps Accuracy 3 cps per mc per degree Centigrade 30-3 1
LOWFREQUENCY
STANDARDS
: 100B 100 kc, 10 kc, 1 kc, 100 cps Temperature controlled; accuracy 0.001 % 30-3 1
Controlled by 100A or 100B. Multipliers also
FREQUENCY DIVIDER 110 100 to 10 cps
available up to 1 mc 30-31
200A 35 to 35,000 cps Output 1 watt into 500 ohms; 1 % distortion 4-5-6-7
..
. . "---
200B 20 to 20,000 cps Output 1 watt into 500 ohms; 1 distortion 4-5-6-7
--- .
200C 20 to 200,000 CS
P Output 10 volts into 1,000 ohms; 1% distortion 4-5-6-7
. _I , -----
j 7 to 70,000cps Output 10 volts into 1,000 ohms; distortion 4-5-6-7
RESISTANCE-TUNED
OSCILLATORS
Frequency setting closer than 1%; output 10 volts
2001 6 to 6,000 cps
into 1,000 ohms; 1 % distortion 4-5-6-7
,
Output 3 watts at 1 % and 1 watt at
201B 20 to 20,000 cps
distortion into 600 ohms 8-9
For low frequency studies. Output 10 volts
'/a to 1,000 cps
into 1,000 ohms; 1 YO distortion 10-1 1
2 to 70,000 cps Output 10 volts into 1,000 ohms; distortion 4-5-6-7
Output 5 watts, 1 % distortion into impedances of
20 to 24000 cps 50, 200, 600, 5,000 ohms. Output VTVM and 110
db attenuator, 1 db steps
12-13
205AG 20 to 20,000 cps
Some as 205A, plus separate VTVM for complete
gain measurements 12-13
AUDIO SIGNAL --------
GENERATORS Output 5 watts, 3% distortion into 50, 200, 500,
205AH 1 to 100 kc 5,000 ohm impedances. Output VTVM and 110 db
attenuator, 1 db steps 12-13
Output +15 dbm with less than 0.1% distortion
206A 20 to 20,000 cps into 50, 150, 600 ohm impedances. Output VTVM
and 11 1 db attenuator in 0.1 db steps 14-15
Output 50 volts peak to peak; 1,000 ohm internal
SQUARE WAVE 210A 20 to 10,000 cps
impedance; 70 db attenuator 5 db steps 10-1 1
GENERATOR
Variable selectivity; measurement range 1 mv to
WAVE ANALYZER 300A 30 to 16,000 cps
500 volts; 5% accuracy 24-25
CAOLS
Measures total distortion as low as 0.1%. 70 db
400 cps and kc
attenuator, 1 db steps for comparison 20-2 1
% - - - I_-_.---
320B 50, 100, 400 cps and
Same as 320A 20-21
1 5 and 7.5 kc
,
- 30,50,100,400,1,000
cps; Measures total distortion os low as 0.1%. Input
DISTORTION
ANALYZERS
325B 5 , 7.5, 10 and 15 kc ,
amplifier and complete VTVM each usable 22-23
separately
frequency 20 to Similar to 325B but measures at any frequency
330B 20,000 cps and includes AM detector 22-23
Similar to 3 0 1 no AM detector. Meter has VU
31,
Any frequency 20 to
330C 20,000 cps
characteristics to meet FCC requirements for
FM broadcasting
22-23
F BROADCAST
M FCC approved. Monitors carrier frequency and
MONITOR
335B 88 to 108 mc modulation. High fidelity output for aural
, monitoring
~
110 db, 1 db steps; 5 watts, 500 ohm level.
Max 100 kc Bridged T type. Accuracy 1 db in 50 db
at 100 kc
32-33
ATTENUATORS
Max 100 kc Same as 350B but 600 ohm level 32-33
. .
Nine ranges 0.03 to 300 volts full scale. Accuracy
10 cps t 1 mc
o *3% to 100 kc, f5% to 1 mc. Average reading. 26-27
Calibrated in rms.
AC: six ranges 1 to 300 volts. DC: seven ranges
VACUUM TUBE 20 cps to 700 mc 1 to 1,000 volts. Resistance: seven ranges 28-29
VOLTMETERS 0.2 ohm to 500 megohms
.
AND
ACCESSORIES 455A Connects probe of 410A across 50 ohm transmis-
sion line. Type N fittings 40
Connects probe of 410A to open end of 50 ohm
458A to 1,000 mc
transmission line. Type N fittings 40
40 db and 20 db stabilized gain. Input imped-
shunted by approximately 15 uuf.
34-35
ELECTRONIC 500A
36-37
FREQUENCY METER
5 cps to 50 kc
I Ten ranges, * 2 % accuracy. Input 0.5 to 200 volts
505A 300 to 3,000,000 rpm Ten ranges, *2% accuracy 37
ELECTRONIC
TACHOMETER
505B 5 to 50,000 cps Same as 505A except calibrated in cps 37
Calibrated output 0 1 microvolt to 0.1 volt. Internal
.
610A 500 to 1,350 mc
pulse modulation. Direct calibration 20-2 1
Direct reading. Pulse modulation, CW and FM.
1,800 4,000 mc
to
Calibrated output 01 microvolt to 0.2 volts
. 18-19
.... --
Direct reading. Six bonds. Output 3 volts to 600
10 cps to 10 mc ohm load. VTVM and output attenuator 16-1 7
Any dc voltage 180 to 360 for 0 to 75 ma load;
POWERSUPPLY 710A approximately 1 % regulation. Also 6.3 volts, 34-35
5 amps ac.
-
SPEED AND ACCURACY ARE INTEGRAL PARTS OF EVERY - h p - INSTRUMENT
testing are made possible by the use of -hp- instruments. Although each is tai-
lored for very specific jobs, -hp- laboratory instruments have certain outstanding
"family" characteristics. No zero setting, little or no adjustment during opera-
tion, virtual independence of line and tube characteristics, full protection against
overloads, simple, accurate calibration, and streamlined circuits for clean and
trouble-free performance are qualities you will find throughout the -hp- line.
-hp- instruments are essential and versatile tools in the fields of television, fre-
quency modulation, radar, industrial heating, communications, carrier current,
equipment manufacture, experimental work, broadcasting, industrial testing.
Here is a partial list of the measurements that can be made with standard -hp-
instruments : distortion, frequency, gain, voltage, network response, harmonic
analysis, amplifier frequency response. They are also useful to establish standard
frequencies, establish standard ratios by attenuation, and provide voltage for
bridge measurements. Let -hp- instruments, products of sound engineering
and precision manufacture, solve your testing and measuring problems.
ENGINEERING TIME IS AN EXPENSIVE COMMODITY...
Probably in no other field is proper instrumentation so be exercised, not only in making the measurements them-
vitally important as in electronics. Lacking the proper in- selves, but in interpreting the results.
struments, it is not only difficult to design equipment cor- Engineering time is a very expensive commodity. To em-
rectly in the first place, but often impossibleto tell whether ploy it most efficiently, too much thought cannot be given to
it is behaving Properly when completed. the selection of the proper tools. -hp- instruments are designed
with convenience second only to accuracy in their require-
To describe fully the performance of one of the simplest elec- ments. By minimizing the time needed for routine measure-
tronic devices-a single-stage amplifier-requires the meas- ments, and by guaranteeing the accuracy of the results, -hp-
urement of operating voltages and currents, gain, frequency instruments render an outstanding service toward the ad-
response, overload points, harmonic distortion, and noise vancement of the science of electronics. O n the following
level. In more complex apparatus the list would be greatly pages you will find complete descriptions of a great many
expanded. Many of these measurements must be made in -hp- instruments. Please feel free to write us for any assist-
high-impedance circuits where great care and judgment must ance or further information which you may require.
3
MODEL 200
AUDIO OSCILLATOR
RESISTANCE-TUNED PRINCIPLE
HERE is a sound research story behind this revolution-
ary -hp- Resistance-tuned Audio Oscillator. Although
ADVANTAGES:
audio-frequency oscillators have always been standard
No zero setting. Great stability equipment throughout the communications and electronics
Constant output fields, there were many "bugs" in types commonly available.
Wide frequency range These disadvantages included low stability, especially in the
Logarithmic scale lower frequency ranges; need for constant resetting to insure
Low distortion. Light weight
accuracy; low portability, because of the essential weight and
bulk of the instrument. So -hp- engineers set out to design
and perfect an audio-frequency oscillator which would com-
USE THEM FOR:
bine the high stability and very wide range of the coil-
Amplifier testing condenser type with the flexibility of operation of the beat
Broadcast transmitter audio response frequency type. The result is the basically new Resistance-
Source of voltage for bridge tuned Audio-frequency Oscillator, based on a new funda-
measurements mental circuit and resulting in new speed and accuracy for
Modulating signal generators electronic tests and measurements.
Supersonic voltage source The fundamental resistance-tuned circuit of -hp- Audio
Driving mechanical systems Oscillators is shown above. The resonant frequency of this
Synchronizing pulse generators network is inversely proportional to the product of resistance
Loud speaker resonance tests and capacity. Thus the change in resonant frequency of this
circuit is three times as great as that of the coil and condenser
circuit. A ten to one frequency change is easily possible with
the resistance-tuned circuit.
4
The resistance-capacity (frequency determining) network -hp- Resistance-tuned Audio Oscillators provide an excel-
is operated in conjunction with a stabilized amplifier. Positive lent source of voltage for accurate bridge measurements. The
feedback is applied to this amplifier through the resistance- output is sufficient to drive signal generators and other equip-
tuned network, resulting in a very high effective Q for the ment requiring considerable power. Certain models are also
circuit. See figure 1 . Negative feedback is also used, and adapted to work in the supersonic range:
operates in conjunction with a non-linear resistor to limit The usefulness of these oscillators is greatly increased be-
amplitude and decrease distortion. It also helps in providing cause they are small and light in weight; thus easy to carry
a constant and extremely stable output over the entire range. around. In short, the speed and accuracy of -hp- Resistance-
See figure 2 . tuned Audio Oscillators make them ideal for an almost end-
less number of exacting jobs.
NO ZERO SETTING
The excellent physical layout of -hp- Audio Oscillators has SPECIFICATIONS
much to do with their satisfactory performance. Thermal drift
is kept at a minimum by proper placement of components, and Six standard models are available. The Models 200A and
by means of low temperature coefficient elements in the resist- 200B have a transformer-coupled output amplifier which will
ance network. Furthermore, this thermal drift is not magni- deliver 1 watt into a matched load and are principally de-
signed for use in audio testing. The Models 200C and 200D
fied, as is the case with the beat frequency type oscillator. Thus
calibration is accurate under all operating conditions, without have a resistance-coupled output amplifier to provide uniform
output voltage over their wide frequency range; they are prin-
the inconvenience of constant zero setting, even within the
cipally useful when handling a wide range of frequencies,
first few minutes of operation. The constant output of these
oscillators makes it easy to check the frequency response of the where a smaller amount of power is sufficient. Model 202D is
apparatus quickly, easily, accurately. a modification of Model 200D, with the frequency range ex-
tended down to 2 cycles per second. It is particularly useful
where it is necessary to generate an extremely wide range and
where low frequencies are involved, as in mechanical vibra-
tion problems. The Model 2001 is an oscillator of the band
spread type. It is intended for interpolation work and for
applications where it is necessary that the frequency of oscilla-
tion be known very accurately. These oscillators are supplied
in a relay rack mounting, as the 200AR, 200BR, 200CR,
200DR, 202DR, and 200IR.
Figure 1
FREQUENCY
I
ONLY THREE DIALS
There are only three controls on the panel. They are the DISTORTION AND AMPLITUDE CHARACTERISTICS I
main frequency dial which covers a frequency range of 10 to
1; a range switch which selects the desired frequency band,
and an amplitude control to vary the output signal level.
USES
The primary function of an audio-frequency oscillator is
to generate an accurately controlled signal of known fre-
quency. This signal may be used to check the performance of
audio amplifiers, broadcast transmitters, and similar equip-
ment. Although applications in the related fields of electronics
are of first importance, the usefulness of the -hp- Resistance-
tuned Audio Oscillator is by no means limited to the electrical
engineering fields. They may be used, for example, to drive
mechanical systems, in order to measure resonance and sta-
bility. Other measurements of mechanical equipment include
measurements of the output frequency of rotating equipment,
such as generators and dynamotors.
5
Output: The Models 200A and 200B will supply one watt
or 22.5 volts output into a matched resistance load of 500
ohms, and 25 volts on open circuit. Models 200C, 200D,
202D, and 200I will deliver 100 milliwatts or 10 volts into
a 1000 ohm load. The internal impedance of the output am-
plifier is in the order of 50 ohms at 1000 cps.
Frequency Response: The output voltages of Models
200A and 200B are constant within plus or minus one decibel
from 20 cps to 15 kc. The output voltage of the Model 200C
t
is constant within plus or minus one decibel from 20 cps to
150 kc. The output voltages of the Models 200D and 202D
i
are constant within plus or minus one decibel from 7 cps to
70 kc. The Model 202D will be within plus or minus 2 deci-
FREQUENCY RANGE
bels from 2 cps to 7 cps. The frequency response of the 200I
Model 200A . . . . . . . . 35 cps to 35 kc
is plus or minus one decibel from 6 cps to 6,000 cps.
Model 200B . . . . . . . . 20cps to 20 kc
Model
Model
200C
200D
. . . . . .
. , , , . .
. .
. .
20 cps to 200 kc
7 cps to 70 kc Distortion: The total rms distortion contained in the iI
Model 202D . . . . . . . . 2 cps to 70 kc waveform of the various models is within the following
Model 200I . . . . . . . . 6 cpstp 6 k c limits: Models 200A and 200B, less than 1 % distortion from
Calibration: The dial is calibrated directly in cycles for
35 cps to 15 kc. Model 200C, less than 1 % distortion from 20
cps to 100 kc. Model 200D, less than 1% distortion from 10
I
the lowest range. A switch selects the range and indicates the
cps to 70 kc. Model 202D, less than 2 % at rated output volt- I
proper multiplying factor. The dial calibration of Models
age from 10 cps to 70 kc. Model 200I, distortion less than 1 %
200A, 200B, and 200C covers approximately 180 degrees,
above 10 cps, and only slightly more than this at lower fre-
with an equivalent scale length of 20 to 30 inches. Models
quencies.
200D and 202D have dial calibrations covering approxi-
mately 300 degrees with a scale length of about 60 inches. Hum Voltage: On all models, the hum voltage is less
Model 200I is calibrated over approximately 300 degrees, than 0.1 % of maximum output voltages.
and has a scale length of approximately 90 inches.
Power Supply: 115 volts, 50/60 cycles, 60 watts.
200A 200B
Range 1 , , 35-350 cps . . . . . 20-200 cps Mounting: The cabinet models are mounted in an at-
Range 2 . . 350-3500cps . . . . 200-2000 cps tractive steel cabinet finished in wrinkle gray.
Range 3 , , 3500cps-35kc , . . 2000cps-20kc The relay rack mounting fits the standard 19" relay rack
200C 200D with Y4'' spacing. The dust cover mounts on the chassis and
Range 1 . , 20-200cps . . . . . 7-70cps is removable from the rear.
Range 2 . . 200-2000cps . . . . 70-700 cps
Range 3 , . 2000cps-20kc . . . . 700-7000cps Model Mounting Length Height Depth Weight
Range 4 . . 20-200 kc . . . . 7000cps- 70 kc 200A Cabinet 16" 7" 9" 32 Ibs.
Model 202D is similar to Model 200D, with the addition of a 200B Cabinet 16" 7" 9" 32 Ibs.
2-50 cps band covering approximately 200 degrees on the main 200C Cabinet 16" 7" 9" 7 30Ibs.
tuning dial.
2001 200D Cabinet 17" 8Y4" 11" 32 Ibs.
Ax1 . . . 6 - 20 cps Bx10 . . 200- 600 cps 202D Cabinet 17" 8Y4" 11" 32 Ibs.
Bx1 . , . 2 0 - 60 cps Ax100 . . 600-2000cps 2001 Cabinet 17" 8y*" 10%" 32 Ibs.
Ax10 . . . 60-200 cps Bx100 . . 2000-6000 cps 200AR Relay Rack 19" 7I' 9" 35 Ibs.
200BR Relay Rack 19" 7`* 9" 35 Ibs.
Stability: Under normal conditions the frequency drift is
200CR Relay Rack 19" 7" 9" 35 Ibs.
less than & 2 % or 0.2 cps (whichever is greater) including
200DR Relay Rack 19" 8Y4" 11" 37 Ibs.
initial warm-ups. Plus or minus 10 volt line voltage variations
202DR Relay Rack 19" 8Y4" 11" 37 Ibs.
change the frequency less than 2 0 . 2 % at 1 kc. No zero set-
200IR Relay Rack 19" 8%" 11" 37 Ibs.
ting is necessary on these oscillators. On Model 200I, if the
Average shipping weight 42 Ibs.
ranges are standardized against a suitable frequency standard
from time to time, accuracy better than 1 % can be maintained. Data subject to change without notice.
6
200B AND 200C 2008)
Here is the main tuning dial of -hp- Models 200B and 200C Main tuning dial of -hp- Model 200D is calibrated over ap-
Audio Oscillators. Range is 20 cps to 20 kc on 200B, with proximately 300' and has an effective scale length of about
dial calibrated over approximately 180' and effective scale 60". This wide range instrument (from 7 cps to 70 kc) owes
length of about 20"; 200C has range of 2 0 cps to 200 kc and much of its speed and accuracy of operation to the precisely
effective scale length of about 26". calibrated and easily controlled tuning dial pictured above.
202D 200I
The -hp- Model 202D is a modification of the 200D, which Main tuning dial of the 200I, which is an oscillator of the
extends the range down to 2 cps. The tuning dial is calibrated band-spread type, intended for comparison work. The dial is
over approximately 300' ; the effective scale length is about calibrated over approximately 300' with effective scale length
75". Before calibration, all -hp- Audio Oscillators are oper- about 90" and range of 6 cps to 6 kc. Each Model 200I is
ated for a long period so as to be completely stabilized. carefully hand calibrated to insure maximum accuracy.
7
MODEL 201B
AUDIO OSCILLATOR
STABILIZED POWER
AMPLIFIER AMPLIFIER
CHECK THE ADVANTAGES OF
THIS FINE, NEW OSCILLATOR
ADVANTAGES:
3 watts output N FM and other fields where high fidelity is important,
Distortion less than '/2% this new -hp- Model 201B Audio Frequency Oscillator
Low hum level will meet every requirement for speed, ease of operation,
New dial with ball-bearing drive accuracy and purity of wave form. The product of 6 years of
Accurate expanded frequency
-hp- oscillator development, this new oscillator has many
calibration brand new features, in addition to the revolutionary resistance-
Improved control of output level tuned circuit which has made -hp- a by-word in engineering
circles.
USE IT FOR: The 201B has an accurate, convenient method of frequency
control. The 6" dial, with smooth ball-bearing action, may be
High fidelity amplifier testing
tuned by a directly controlled knob, or for still greater accu-
Transmission line measurement
racy, may be set by the vernier which has a ratio of 6 to 1 to
Loud speaker testing
the main dial. The illuminated main dial is designed so that
Frequency comparison
parallax is eliminated. It is calibrated over 300 degrees with
approximately 95 calibration points and has an effective scale
length of about 47 inches. Frequency range is 20 cps to 20 kc.
8
INCREASED POWER OUTPUT Frequency Calibration: The calibration is direct in
cycles per second for the lowest band. Approximately 95
The amplifier delivers up to 3 watts of power into a 600
calibration points are provided over a 300-degree arc. The
ohm resistance load, with distortion held to 1 76. Thus there is
dial is 6 inches in diameter, illuminated and driven by a
sufficient power available for driving almost any kind of lab-
vernier knob having 6 : 1 ratio. The effective scale length for
oratory or production equipment. Harmonic distortion may
the three bands is 47 inches.
be kept to less than y2of 1 %, if the output of the amplifier is
limited to 1 watt. Stability: Under normal temperature conditions the fre-
Another important feature of this oscillator is the provision quency stability is better than -+2%, including the initial
which is made for standardizing each frequency range against warm-up drift. Plus or minus 10 volt line voltage variations
a reliable standard, such as -hp-'sModel 100B Secondary Fre- will result in no change in the output frequency. Adjustments
quency Standard. By standardizing the instrument regularly, are provided on each band to standardize the calibration
frequencies can be depended upon to be better than 1 % against an accurately known frequency. With standardization
accurate. the accuracy may be maintained better than & 1 %.
DUAL CONTROL FOR OUTPUT LEVEL Output: The instrument is rated at a maximum of 3 watts
A new departure in oscillator design is the dual method or 42.5 volts into a 600 ohm resistive load. Maximum no load
for controlling output level. A volume control which is ahead voltage is at least 50 volts. The impedance looking back into
of the amplifier controls the voltage at which the amplifier the output circuit (zero attenuator setting) is in the order of
operates. An output attenuator is provided to attenuate the 75 ohms. With attenuator set at a value of 10 db or more the
signal delivered by the amplifier. Attenuation is approxi- impedance looking back into the output is 600 ohms.
mately linear from zero to 40 db. Both hum level and output
Frequency Response: The output voltage is constant
voltage are thus attenuated together. As a result, hum level within & 1 db over the frequency range of 20 cps to 20,000
may be kept 60 db or more below the signal level, a special
cps.
advantage in cases where small test signals are used.
The impedance looking back into the output circuit is about Distortion: The total rms distortion of the output wave
50 ohms ; thus the voltage regulation for varying loads is ex- over the range of 20 cps to 20,000 cps is less than the follow-
tremely good. For measurements where it is desirable to have ing limits :
impedance looking back into the instrument of 600 ohms, as 3 watts output 1% distortion
in transmission measurements, the attenuator may be used to 1 watt output .5% distortion*
give about 10 db or more of attenuation, making the reflected *Down to 50 cps, at 20 cps 1% distortion.
impedance of the instrument about 600 ohms. Volume Control: Two controls are provided for varying
the output of the instrument:
IMPORTANT DETAILS 1. An "Amplitude Control" adjusts the amount of oscil-
Care has been taken to perfect every detail of this new lator voltage fed to the output amplifier.
oscillator. Improved chassis layout and placement of com- 2. An "Attenuator" attenuates the output of the amplifier.
ponent parts minimizes thermal drift. The voltage on the It is a variable T Pad having an attenuation range of 0 to in-
oscillator is maintained constant with an electronic voltage finity. Approximately linear in region 0 to 40 db.
regulator. The entire instrument is characterized by greater
mechanical rigidity; the tuning assembly is mounted on a Hum Voltage: The hum voltage is less 0.03% of maxi-
sturdy cast aluminum frame. The chassis itself is made of mum output voltage. If the output attenuator is used to con-
aluminum; the oscillator is light in weight and easy to handle. trol the output (with Amplitude control set for maximum
rated power output) the hum level will be less than -1%
below any signal level.
SPECIFICATIONS, MODEL 201 B Power Supply: 115 volts i 10 volts, 50/60 cycles.
A F OSCILLATOR Power consumption: 75 watts. Plate supply voltage to oscil-
lator section is electronically regulated.
Frequency Range: The frequency range is from 20 cps
to 20,000 cps covered in three bands. Mounting: Cabinet Models are mounted in an aluminum
cabinet finished in wrinkle gray. Size: 17 in. long x 81/2 in.
Band Frequency Coverage
high x 11 in. deep. Weight: 32 pounds. Shipping Weight:
xl 20 - 200 cps
x10 200 - 2,000 cps
46 pounds.
XlOO 2,000 - 20,000 cps Data subject t o change without notice.
9
LOW FREQUENCY OSCILLATOR
MODEL 210A
S Q UA R E WAVE GENERATOR
10
HIGH ACCURACY FOR LOW FREQUENCY Frequency Dial: 6" diameter. Reads directly in cps for
MEASUREMENTS TO 1000 CPS two lower ranges. Dial is back of panel, illuminated, and is
controlled by direct drive as well as a 6 to 1 vernier.
Now you can make low frequency measurements with all the
precision and stability associated with audio frequency work. Accuracy of Calibrations: + 2 % .
This -hp- 202B oscillator blankets the low-frequency spec- Frequency Stability: f 5 % under normal temperature
trum from `/2 to 1000 cps. Throughout this range it provides conditions (including warm-up drift) . Less than t1% for
better wave form, higher stability and greater measuring ac- power voltage changes of + l o % .
curacy than any instrument ever manufactured for industrial,
field or laboratory use. Output: 10 volts into a 1000 ohm resistive load over the
entire frequency range. Internal impedance approximately 25
USES ohms at 10 cps.
The -hp- 202B gives maximum measuring speed and accuracy Frequency Response: t l db 10 to 1000 cps.
for these important tests : Vibration or stability characteristics t 2 db 1 to 1000 cps.
of mechanical systems, electrical simulation of mechanical
phenomena, electro-cardiograph and electro-encephalograph Distortion: Less than 1% total distortion, 1 to 1000 cps.
performance, seismograph response, vibration checks of struc- Hum Voltage: Less than 0.1% of rated output voltage.
tural components, performance of geophysical prospecting
equipment, Recovery Time: 30 to 60 seconds on lowest frequencies.
SPECIFICATIONS Power: 115 volts t10 volts, 50/60 cps.
Frequency Range: y2cps to 1000 cps in 4 ranges Size: 17" long, 123/4r' deep, high.
Range Frequency Mounting: Wrinkle gray panel, oak cabinet.
A . . . . . . . . . . . . `/~-IcPs
xl . . . . . . . . . . . . 1--1ocps Net Weight: 50 pounds. Shipping Weight: 92 pounds.
x10 . . . . . . . . . . . . 10-100 cps
XlOO . . . . . . . . . . . . 100--1ooocps Data subject to change without notice.
SQUARE W A V E S FOR R A P I D TESTING Output Attenuator: 70 db in 5 db steps.
20 CPS TO 100 KC Driving Voltage: 2 volts required. Input impedance 25,-
000 ohms. May be internally driven with a-c power supply
The -hp- Model 210A Square Wave Generator provides an voltage.
excellent source of square waves for production tests and ex-
Mounting: Steel Cabinet: 15" long, 7jr high, 9" deep.
perimental purposes. The fundamental frequency range is 20
Relay Rack: 19" long, 7" high, 8'' deep.
cps to 10,000 cps. A reasonably square wave may be obtained
at frequencies as high as 100 kc. The square wave frequency Power Supply: Built-in. Operates from 115 volt 50/60
is synchronized from an external source of 2 or more volts. cycle. Requires approximately 85 watts.
Output can be attenuated 70 db from a maximum voltage of Net Weight: 30 pounds. Shipping Weight: 39 pounds.
50 volts, peak to peak. Output voltages balanced to ground. Data subject to change without notice.
USES
The -hp- 210A is ideal for testing receivers, video ampli-
fiers, networks and transmitters ; to measure time constants or I . Square wave distortion
provide a time base, check cathode ray sweep circuits, gen- from poor high
frequency response.
erate harmonics for frequency multiplication or control an
electronic switcher. It may also be used to indicate phase
2. Square wave dirlor-
shift, frequency response, or transient effects. tion from poor response
at both high and low
SPEClFlCATlONS frequencies.
Frequency Range: 20 cps to 10,000 cps. Voltage rise
time: Approximately 1 microsecond to 90% of maximum,
Flat top of wave decays less than 1%,
showing peak at 9 times
Output Voltage: Approximately 50 volts, peak to peak, square wave frequency.
open circuit. The output impedance is 1,000 ohms, balanced
to the ground.
11
AUDIO SIGNAL GENERATOR
RESISTANCE T U N E D
OSCILLATOR WATT AMPLIFIER VOLTMETER 1 DB STEPS
INPUT
AMPLIFIER O NETWORK
R
UNDER TEST
OUTPUT
S I X BASIC INSTRUMENTS COMBINED
ADVANTAGES: TO SPEED G A I N MEASUREMENTS
No auxiliary equipment needed ALL THE necessary instruments for accurate gain or fre-
Range-20 to 20,000 cps quency response measurements have been assembled
5 watts output, less than 1 distortion by -hp- engineers in one compact unit. (See block dia-
No zero setting gram.) No auxiliary equipment is required.
Supplies known voltage
This Audio Signal Generator brings new speed and ease to
Output meter calibrated in volts and decibels
Standardized frequencies instantly available
testing jobs. Any desired frequency within the range of 20
Separate input meter for gain measurements to 20,000 cps is made available by the resistance-tuned audio
Wide range of output impedances oscillator, These frequencies are developed at any desired
voltage between 150 volts and 50 micro-volts.
To make amplifier or network gain measurements with
USE IT FOR:
the -hp- Model 205 AG Audio Signal Generator, the operator
Amplifier gain measurements simply connects input and output leads to the binding posts.
Network frequency response Two vacuum tube voltmeters are provided, one to measure
Source of voltage for distortion input and the second to measure output of the device under
measurements
test. The input meter has a range of minus 5 db to plus 49 db,
Broadcast transmitter audio response
with an input impedance of 5,000 ohms. The attenuator sets
Loudspeaker response
the output voltage, The output impedance can be instantly
, General laboratory applications
changed by means of a selector switch (line matching trans-
Production testing
former in the block diagram) to the commonly used imped-
ances of 50, 200, 600, and 5,000 ohms, a convenience in
12
matching various types of networks. The Model 205AG will Output Meter: The output meter is calibrated directly in
supply 5 watts output with less than 1% distortion, and thus volts at 600 ohms and in db above a 1 mw level (54.7 volts
is useful where sizeable amounts of power are required. Feed- and plus 37 db full scale).
back is used for improved frequency response and lower Input Meter:* The input meter has a range of minus 5 db
distortion. to plus 48 db based on a 1 mw level in 600 ohms. The meter
The -hp- Model 205AG is well adapted to measuring fre- scale is calibrated from minus 5 db to plus 8 db and a multi-
quency response and gain or loss of any network. The fre- plier switch adds from zero to 40 db to the reading in 5 db
quency remains accurate, without the necessity of zero setting. steps. The meter has an input impedance of 5,000 ohms.
-hp- Audio Signal Generators are built for heavy duty and *Not included in Model 205A.
long, hard service. Input Meter Response: The frequency response of the
input meter is within t 0 . 2 db over range from 20-20,OOO cps.
AUDIO AND SUPERSONIC MODELS AVAILABLE
Output Attenuator: The output attenuator provides 110
There are three models of signal generators. The -hp-
db in 1 db sieps. It consists of a 100 db attenuator with 10 db
Model 205AG provides all of the basic components to make
steps and a 10 db attenuator with 1 db steps.
a complete gain measurement in one unit. The -hp- Model
Power Supply: 115 volts -+lo volts, 50/60 cycles.
205A is similar to the 205AG except that the input vacuum
Power consumption: 125 watts.
tube voltmeter is eliminated. For supersonic measurements
the -hp- Model 205 A H Signal Generator is available. This in- Mounting: Available in either relay rack or cabinet mount-
strument is similar to the -hp- Model 205A but covers a fre- ing. Panel size on either instrument, 19" x 1OY2", Cabinet
quency range of 1 kc to 100 kc. models are mounted in oak cabinets. Panels are finished in
wrinkle gray enamel with machine engraved designations.
SPECIFICATIONS, MODELS 2 0 5 A G Net Weight: 73 pounds. Shipping Weight: 116 pounds.
A N D 205A
Frequency Range: The frequency coverage is 20 cps to MODEL 205AH SUPERSONIC SIGNAL
20,000 cps, in three ranges. GENERATOR
Calibration: The dial is calibrated directly in cycles for
Frequency Range: 1 kc to 100 kc, in two ranges.
the lowest range, 20 cps to 200 cps. A switch selects the de-
Power Output: 5 watts at 3 % distortion, 3 watts at 1 %
sired range and indicates the proper multiplying factor. Each
distortion, 1 watt at Y2% distortion.
range covers approximately 270 degrees on the 61/2" main
dial. Range 1 covers 20 cps to 200 cps; Range 2 covers 200 Load Impedances: 50,200, 500 and 5,000 ohm resistive.
The output circuit is balanced and center tapped and any
cps to 2,000 cps; and Range 3 covers 2,000 cps to 20,000 cps.
terminal may be grounded. The internal impedance is ap-
Stability: Under normal temperature conditions the fre- proximately 1/7 of the load impedance with zero attenuator
quency will drift less than 2% over long periods of time. Each
setting. The internal impedance approaches the load imped-
range is provided with an internal adjustment so that 1% ance with attenuator settings of 20 db or more.
accuracy may be maintained if required.
Frequency Response: -t- 1 db from 10 kc reference.
Output: Five watts output will be delivered to a matched
Hum level: The hum level is at least 65 db below output
resistance load.
voltage or 65 db below 1 milliwatt into 500 ohms, whichever
load Impedances: A switch selects transformer taps for is greater.
use with loads of 50, 200, 600 and 5,000 ohm resistive loads.
Output Attenuator: Range: 0 to 110 in 1 db steps.
The output circuit is balanced and center tapped and any
Accuracy: $" db in first 80 db, 3 db in last 30 db.
terminal may be grounded. The internal impedance is ap-
proximately 1/6 of the load impedance with zero attenuator Power Supply: 115 volts, 50-60 cycles, 125 watts.
setting. The internal impedance approaches the load imped- Accuracy o Frequency: + 2 % .
f
ance with attenuator settings of 20 db or more. Stability of Frequency: f l / 2 % after 1/2 hour warm up.
Frequency Response: The frequency response of the
Line voltage changes of t10 volts have negligible effect on
system beyond output meter is down 2.0 db at 20 cps and 1 db frequency as power supply to oscillator is regulated.
at 20,000 cps (at levels from +37 to -10 dbm) . Drop in Output Meter: The output meter is calibrated directly in
response exceeds these limits at levels lower than -10 dbm. volts at 500 ohms and in db above 1 milliwatt level (50 volts
Distortion: The distortion is less than 1 % at rated output and +37 db, full scale).
at all frequencies above 30 cps. Mounting: Same as 205 AG.
Hum Level: The hum level is 60 db below the output volt- Net Weight: 63 pounds. Shipping Weight: 110 pounds.
age or 90 db below zero level, whichever is the larger. Data subject to change without notice.
13
8 MODEL 2 0 6 A
AUDIO SIGNAL GENERATOR
C O N T I N U O U S L Y VARIABLE A U D I O SIGNALS
LESS T H A N 0.1% DISTORTION
ADVANTAGES:
HE newly-developed -hp- Model 206A Audio Signal
Continuously variable a-f voltage
Generator provides a source of continuously variable
Accuracy 0.2 db, any level
audio frequency voltage at a total distortion level of less
High stability than 0.1%. This unique feature, coupled with simple,
Harmonic distortion less than 0.1 Yo straight-forward circuitry, rugged construction and typical
1 1 1 db attenuator, 0.1 db steps -hp- ease of operation, makes this new signal generator ideal
for use in the maintenance of FM broadcasting units and high
USE IT FOR: fidelity audio systems.
A-f voltage source
CIRCUIT DESCRIPTION
Checking FM transmitter response and
distortion The circuit arrangement of the Model 206A is shown in the
block diagram, Figure 1. The oscillator section is followed by
Checking broadcast studio performance
a tuned amplifier, automatically tracked with the oscillator.
High-quality amplifier testing
High selectivity of the amplifier reduces the harmonic volt-
Transmission measurements ages generated by the oscillator section. This serves to reduce
the percentage of harmonic distortion in the voltage reaching
the instrument's output terminals,
14
The selective amplifier is followed by an output amplifier, SPECIFICATIONS
a vacuum tube voltmeter, an attenuator and finally an output Frequency Range: The frequency coverage is from 20
matching transformer. An electronic voltage regulator sup- cps to 20 kc in 3 ranges.
plies plate voltage for the complete circuit.
Calibration: The dial is calibrated directly in cycles for
FREQUENCY DETERMINING NETWORK the lowest range, from 20 to 200 cps. Each range covers ap-
proximately 270 degrees of the 6" dial. The dial is located
The frequency determining network in the instrument's behind the panel and is illuminated. A six to one rim drive
oscillator section is composed of low temperature coefficient enables the equipment to be easily and quickly set to any de-
elements, so that the instrument will have good stability over sired frequency.
long periods of time. The frequency calibration of the instru-
ment is accurate within 1%. Frequencies from 20 cps to 20 kc Stability: The frequency is calibrated to within better
are continuously available. Three decade frequency ranges than 1% when the instrument leaves the factory. The circuit
provide an effective scale length of 47". Tuning dial is con- elements in the frequency determining network have low
trolled directly or with a 6 to 1 vernier micro drive for hair- temperature coefficients and good stability so that excellent
line adjustments. Dial is read through a no-parallax illu- accuracy will be maintained over long periods of time.
minated window. Output: The equipment will deliver an output level of
The output of the amplifier is measured by a vacuum tube + 15 dbm above 1 mw into impedance of 50, 150 and 600
voltmeter. Indications can be read in either volts or dbm to ohms. Approximately 10 volts are available into an open
an accuracy of 0.2 dbm. Following the vacuum tube voltmeter circuit.
is a 11 1 db attenuator which allows the power output to be Output Impedances: The generator has a matched in-
varied in 0.1 db steps. ternal impeda