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SUGGESTIONS FOR ORDERING
..
Order by Model Number .Always order by catalog Terms ... 30 days net. Unless credit has already been es-
model number and name of instrument desired. For example, tablished, shipments will be made c.0.d. All prices are
"Model 206A Audio Signal Generator." Whenever possible quoted f.0.b. Palo Alto.
mention frequency range or other significant specifications
to prevent misunderstanding. Also mention features such as
..
Sales Representatives . Sales representatives are
maintained in principal cities as a service to our customers.
special color, special frequency range, non-standard power Customers are invited to contact the nearest representatives
line voltage, etc., and whether cabinet or rack mounting at any time. They will gladly supply technical information,
style is desired. help prepare your order and, if desired, forward order to
Most Hewlett-Packard instruments are available in either the factory. Orders should be made out to the Hewlett-
cabinet or rack mounting. The letter "R" after the model Packard Company and are subject to final acceptance by
number indicates rack mounting. For example, "206AR". the Company in Palo Alto. Sales representatives and their
addresses are shown on the back cover. Export sales are
An additional charge of $5.00 is made for most rack mount-
made through Frazar and Hansen, Ltd., 301 Clay Street,
ing style instruments.
San Francisco 11, California.
Orders should be sent direct to the factory and addressed
to Hewlett-Packard Company, 395 Page Mill Road, Palo ..
Repairs . W h e n returning instruments for repairs, re-
Alto, California. All orders are subject to final acceptance calibration, or any other reason, please contact the Hewlett.
by the Hewlett-Packard Company. Packard Company for shipping instructions. Give model
number, type number, and serial number and as much in-
Shipments . . .Unless specifically requested otherwise, formation as possible concerning reason for return.
shipments are made by express. This policy is born of Repairs are made by the Hewlett-Packard Company at
experience. Delicate instruments require the careful han- cost of labor and materials plus a small service charge.
dling received in express shipment, and over a long period Customers are invited to make full use of this service to
of time this method has proved most satisfactory. On re- insure maximum benefit from their instruments.
quest, shipments will be made by air freight or by truck.
W e d o not recommend shipment by parcel post or by
Repair Parts .. .When ordering repair parts please de-
scribe carefully parts required. Give model number, type
freight, and shipments will not be made by this type of number, serial number of the instrument and date of orig-
carrier without specific instructions from the customer and inal purchase. Identify parts on the wiring diagram if pos-
the understanding that safe arrival is his entire risk. sible, giving date shown on the circuit wiring diagram.
WHERE TO F I N D THE
I N S T R U M E N T S YOU N E E D
I N T H I S CATALOG
or your convenience, the -hp- measuring instruments in this catalog are
grouped together according to their uses and applications.
For speedy reference, see listing below, then turn to the section desired for
detailed information.
OSCILLATORS for general test signals.
V A C U U M TUBE VOLTMETERS and accessories for voltage, current, or power measurements.
AUDIO SIGNAL GENERATORS for measuring gain, frequency response, amplifier characteristics, etc.
PULSE GENERATOR for radar, nuclear and TV circuits.
DISTORTION ANALYZERS for total distortion and wave form measurements.
SQUARE W A V E GENERATORS for transient response determination.
SIGNAL GENERATORS for measuring receiver performance, standing wave ratio, gain, antenna and trans-
mission line characteristics, etc.
MICROWAVE EQUIPMENT. Impedance and power measuring equipment, Low Pass Filters, Detectors.
FREQUENCY MEASURING EQUIPMENT, Frequency Standards for audio, supersonic and rf measurements.
FM and T V Broadcast Station Monitors, Direct Reading Electronic Tachometers.
POWER SUPPLIES, regulated, for laboratory and general use.
ATTENUATORS for use in measuring gain, frequency response, voltage ratios, etc.
WIDE BAND AMPLIFIERS for faithful pulse amplification, VTVM multipliers, general laboratory use, etc.
ORDERING INFORMATION, RETURNING INSTRUMENTS to -hp-. Repair Information.
SALES and SERVICE Representatives in your locality.
PRICES: Prices are shown on the table of brief specifications preceding each group of instruments, or in the
detailed specifications of individual instruments.
ENGINEERING TIME IS AN E X P E N S I V E COMMODITY...
Probably in n o 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. /
stwnaents, 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 impossible to 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.
1
SPEED A N D ACCURACY ARE INTEGRAL PARTS OF EVERY - h p - INSTRUMENT
EW ease and sureness in all types of laboratory and production
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
"familv" 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,
_I
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.
4
OSCILLATORS
for genera1 test signals
OUTPUT
OSCILLATOR EQUIPMENT
INDICATOR
FROM 1/2 cycle to 10 megacycles, there is an -hp- resist- low distortion, and freedom from adjustment during opera-
ance-tuned oscillator engineered to your exact need. Ten tion.
instruments in all; each with the familiar -hp- advan- More details of these instruments are given below, and full
tages of high stability, constant output, wide frequency range, information will be found on the pages indicated.
FREQUENCY
INSTRUMENT PRIMARY USES OUTPUT PRICE PAGE
RANGE
-hp- 200A Audio tests 35 cps to 35 kc 1 watt/22.5v $1 20.00' 6-7-8-9
.hp. 200B Audio tests 20 cps to 20 kc 1 watt/22.5v $1 20.00. 6-7-8-9
-hp- 200C Audio and supersonic tests 20 cps to 200 kc 100 mw/lOv $1 50.00' 6-7-8-9 -
-hp- 200D Audio and supersonic tests 7 cps to 70 kc 100 mw/lOv $175.00* 6-7-04
-hp- 200H Carrier current, telephone tests 60 cps to 600 kc lOmw/l v $350.00* 6-7-8-9
-hp- 2001 Interpolation and frequency measurement 6 cps to 6 kc 100 mw/lOv $225.00* 6-7-8-9
-hp- 201 B High quality audio tests 20 cps to 20 kc 3 w/42.5v $250.00' 10-11
-hp- 202B tow frequency measurements '/2 cps to 50 kc 100 mw/lOv $350.00+ 12
-hp- 202D l o w frequency measurements 2 cps to 70 kc 100 mw/lOv $275.00* 6-7-8-9
-hp- 204A Portable, battery operated 2 cps to 20 kc 2.5 mw/5v $175.00 13
-hp- 650A Wide range video tests 10 cps to 10 mc 15 mw/3v $475.00+ 14-15
Data Subject to Change Without Notice. Prices f.0.b. Polo Alto, California.
tRack mounting available at no extra cost.
'Rock mounting available at $5.00 extra.
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.
6
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-
fied, as is the case with the beat frequency type oscillator. Thus signed for use in audio testing. The Models 200C and 200D
calibration is accurate under all operating conditions, without have a resistance-coupled output amplifier to provide uniform
the inconvenience of constant zero setting, even within the output voltage over their wide frequency range; they are prin-
first few minutes of operation. The constant output of these cipally useful when handling a wide range of frequencies,
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 200I 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
O N L Y THREE DIALS
There are only three controls on the panel. They are the D I S T O R T I O N A N D AMPLITUDE CHARACTERISTICS
OF RESISTANCE-CAPACITY OSCILLATOR
main frequency dial which covers a frequency range of 10 to
I I
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 a n 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- 0.2
tuned Audio Oscillator is by no means limited to the electrical 01
engineering fields. They may be used, for example, to drive 10 I00 1000 10000 1mw
mechanical systems, in order to measure resonance and sta- FREQUENCY IN C.P S
bility. Other measurements of mechanical equipment include
measurements of the output frequency of rotating equipment,
such as generators and dynamotors.
7
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. Model 200H,
10 milliwatts to a 100 ohm load.
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
MODEL 202D is constant within plus or minus one decibel from 20 cps to
150 kc. The output voltages of the Models 200D and 202D
are constant within plus or minus one decibel from 7 cps to
FREQUENCY RANGE 70 kc. The Model 202D will be within plus or minus 2 deci-
Model 200A . . . . . . . . 35 cps to 35 kc bels from 2 cps to 7 cps. The frequency response of the 2001
Model 200B . . . . . . . . 20 cps to 20 kc
is plus or minus one decibel from 6 cps to 6,000 cps; 200H,
Model 200C . . . . . . . . 20 cps to 200 kc
plus or minus one db, 60 cps to 600 kc.
Model 200D . . . . . . . . 7 cps to 70 kc
Model 200H . . . . . . . . 60 cps to 600 kc
Model 202D . . . . . . . . 2 cps to 70 kc Distortion: The total rms distortion contained in `the
Model 200I . . . . . . . . 6 cps to 6 kc waveform of the various models is within the following
limits: Models 200A and 200B, less than 1 % distortion from
Calibration: The dial is calibrated directly in cycles for
3 5 cps to 1 5 kc. Model 200C, less than 1% distortion from 20
the lowest range. A switch selects the range and indicates the
cps to 100 kc. Model 200D, less than 1% distortion from 10
proper multiplying factor. The dial calibration of Models
cps to 70 kc. Model 202D, less than 2 % at rated output volt-
200A, 200B, and 200C covers approximately 180 degrees,
age from 10 cps to 70 kc. Model 200I, distortion less than 1%
with an equivalent scale length of 20 to 30 inches. Models
above 10 cps, and only slightly more than this at lower fre-
200D and 202D have dial calibrations covering approxi-
quencies. Model 200H, 1% distortion to 100 kc, 3 7 0 , 100
mately 300 degrees with a scale length of about 60 inches.
kc to 600 kc.
Model 2001 is calibrated over approximately 300 degrees,
and has a scale length of approximately 90 inches. Hum Voltage: On all models, the hum voltage is less
200A 200B than 0.1 % of maximum output voltages.
Range 1 . . 35 .350 cps . . . . . 20 .200 cps Power Supply: 115 volts, 5 0 / 6 0 cycles, 60 watts.
Range 2 . . 350-35OOcps . . . . 200-2OOOcps
Range 3 . . 35OOcps-35 kc . . . 2000cps-20kc
Mounting: The cabinet models are mounted in an at-
200C 200D 200H tractive steel cabinet finished in wrinkle gray.
Range 1 . 20 .200 cps . . . 7 . 70 cps . . . 6 0 .600 cps The relay rack mounting fits the standard 1 ' 9 relay rack
Range 2 . 200 .2000 cps . . 70 . 700 cps . . . .6 . 6 kc with 3/4" spacing. The dust cover mounts on the chassis and
Range 3 . 2OOOcps-20 kc . 700 - 7000 cps . . 6 - 60 kc
is removable from the rear.
F
Range4 . 2 0 - 2 0 0 kc. . . 7000 cps . 70 kc . 6 0 - 6 0 0 kc
Model 202D is similar to Model 202D, with the addition of a
Model Mounting* Length Height Depth Weight
2-50 cps band covering approximately 200 degrees on the main
tuning dial. 200A Cabinet 16" 7 *' 9" 32 Ibs.
2001 200B Cabinet 16" 7" 9" 32 Ibs.
Ax1 . . . 6- ~OCPS BxlO . . 200- 6 0 0 ~ ~ ~ 16"
Bxl . . . 20- ~ O C P S AxlOO . .
600-2000~p~ 200C Cabinet 7" 9" 30 Ibs.
Ax10 . . . 6 0 - 2 0 0 ~ ~ ~BxlOO . .
~OOO-~OOOCPS 200D Cabinet 17" 83/4" 11" 32 Ibs.
202D Cabinet 17" 83/4" 11" 32 Ibs.
Stability: Under normal conditions the frequency drift is
200H Cabinet 17" 81/2" lOj/," 32Ibs.
less than + 2 % or 0.2 cps (whichever is greater) including
initial warm-ups. Plus or minus 10 volt line voltage variations 2001 Cabinet 17" 8%" 10%" 32 Ibs.
change the frequency less than t 0 . 2 % at 1 kc. No zero set- Average shipping weight 42 Ibs.
ting is necessary on these oscillators. On Model 200I, if the " T h e instruments available for rack mounting with 19" long panel.
ranges are standardized against a suitable frequency standard
from time to time, accuracy better than 1 % can be maintained. Dala snbject to chatige without riotice.
8
200B AND 200C 200D
Mere is the main tuning dial of -hp- Models 200B and 200C Main tuning dial of -hp- Model 2 0 0 D 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 20 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 2001
The -hp- Model 2 0 2 D is a modification of the 200D, which Main tuning dial of the 2001, 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.
9
MODEL 201B
AUDIO OSCILLATOR
STABlLZED 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 1/2% 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.
10
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%. 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 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 A p ' s Model 100C 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 2 1 %.
DUAL CONTROL FOR OUTPUT LEVEL Output: The instrument is rated at a maximum of 3 watts
or 42.5 volts into a 600 ohm resistive load. One terminal is
A new departure in oscillator design is the dual method
at ground potential. Maximum no load voltage is at least 50
for controlling output level. A volume control which is ahead
volts. The impedance looking back into the output circuit
of the amplifier controls the voltage at which the amplifier
(zero attenuator setting) is in the order of 75 ohms. With
operates. An output attenuator is provided to attenuate the
attenuator set at a value of 10 db or more the impedance look-
signal delivered by the amplifier. Attenuation is approxi-
ing back into the output is 600 ohms.
mately linear from zero to 40 db. Both hum level and output
voltage are thus attenuated together. As a result, hum level Frequency Response: The output voltage is constant
may be kept 60 db or more below the signal level, a special within -t 1 db over the frequency range of 20 cps to 20,000
advantage in cases where small test signals are used. cps.
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
oscillator is maintained constant with an electronic voltage It is a variable T Pad having an attenuation range of 0 to in-
regulator. The entire instrument is characterized by greater finity. Approximately linear in region 0 to 40 db.
-
mechanical rigidity; the tuning assembly is mounted on a Hum Voltage: The hum voltage is less 0.1% 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, M O D E L 201 B Power Supply: 115 volts L 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 Sl/, in.
Band Frequency Coverage
high x 11 in. deep. Weight: 32 pounds. Shipping Weight:
x l 20 200 cps
46 pounds.
x10 200 2,000 cps
XlOO 2,000 20,000 cps Data subject to change without notice.
11
LOW FREQUENCY OSCILLATOR
HIGH ACCURACY FOR LOW FREQUENCY Frequency Dial: 6" diameter. Reads directly in cps for
MEASUREMENTS-% CPS TO 50,000 CPS the lowest range. Dial is back of panel, illuminated, and is
controlled by direct drive as well as a 6 to 1 vernier.
O W you can make low frequency measurements
with all the precision and stability associated with Accuracy of Calibrations: t 2 % .
audio frequency work. This -hp- 2 0 2 B oscillator Frequency Stability: 2 % under normal temperature
blankets the low-frequency spectrum from y2to 50,000 cps. conditions (including warm-up drift). Less than + I % for
Throughout this range it provides better wave form, higher power voltage changes of *lo%.
stability and greater measuring accuracy 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
The -hp- 202B gives maximum measuring speed and accuracy
ohms at 10 cps.
-
Frequency Response: t1 db 10 to 50,000 cps.
for these important tests : Vibration or stability characteristics -+2 db 1 to 50,000 cps.
of mechanical systems, electrical simulation of mechanical
phenomena, electro-cardiograph and electro-encephalograph Distortion: Less than 1% total distortion, 2 to 50,000
cps.
performance, seismograph response, vibration checks of struc-
tural components, performance of geophysical prospecting Hum Voltage: Less than 0.1% of rated output voltage.
equipment. Recovery Time: Less than 2 0 seconds on lowest fre-
SPECIFICATIONS quencies.
Frequency Range: y2 cps to 50 kc in 5 ranges Power: 115 volts k 1 0 volts, 50/60 cps.
Range Frequency Size: 17" long, 1 2 3 / " deep, high,
XI . . . . . . . . . . . . . y2-5cps
XI0 . . . . . . . . . . . . . 5-~OCPS Mounting: Smooth gray panel, oak cabinet.
XI00 . . . . . . . . . . . . . 50-5oocps Net Weight: 50 pounds. Shipping Weight: 92 pounds
xlK . . . . . . . . . . . . . ~OO-~,OOOCPS
xlOK . . . . . . . . . . . . .~ , O O O - ~ O , O O O C ~ S Data subject t o change without notice.
12
MODEL 2 0 4 A
AUDIO
OSCILLATOR
(PORTABLE)
BATTERY-OPERATED PORTABLE FOR SPECIFICATIONS
FREQUENCIES FROM 2 CPS TO TO 20 KC
Frequency Range: 2 cps to 20 kc in 4 decade ranges. Di-
HIS new -hp- oscillator is a compact, light-weight, pre- rectly calibrated, 2 cps to 2 0 cps, on the lowest range.
cision instrument designed for use where ac power sup- Stability: +3% including changes due to temperature,
plies are not available. It is particularly useful in tube and battery aging.
checking telephone or remote broadcast lines ; in strain gauge
Output: 5 v maximum into 10,000 ohm load. Output level
applications or checking telemetering systems in aircraft, for
geophysical field parties; or in the laboratory when a com-
continuously variable, zero to maximum. -
pletely hum-free audio signal is desired. The instrument Frequency Response: Flat within 1 db, 2 cps to 2 0 kc.
operates from standard flashlight and 45 volt batteries, and Distortion: Less than 170, 20 cps to 10 kc. Not over 2c/,,
is completely enclosed by a sturdy, splash-proof dural case. up to 20 kc.
Battery Life: 60 hours total, when used at rate of 4 hours
STABLE, EASY TO OPERATE per day, continuous.
Model 204A has the familiar -hp- characteristics of simple
Batteries Required: Filament: 5 Xo. 2 flashlight cells.
operation, rugged construction, and freedom from zero
Plate: 3 Burgess No. 5308 4 5 v. or
setting during use. The frequency range of 2 cps to 2 0 kc is
equal.
covered in 4 decade ranges instantly selected by a front
panel switch. Frequencies are set and read directly on the 6" Size: l O l / , " x 101/2'' x I t " deep. Net weight, incl. batteries,
tuning dial. Vernier control is provided for precise frequency approximately 2 4 Ibs. Shipping weight 37 Ibs.
settings. Output is stable and constant over the entire fre- Mounting: Welded dural case, gasketed splash cover.
quency range, and the instrument is relatively unaffected by
temperature or humidity changes. Data subject t o chaizge without notice.
13
TEST OSCILLATOR
FAST, ACCURATE TESTS
10 CPS TO 10 MC
ADVANTAGES:
HIS -hp- Model 650A Oscillator is the newest and finest
No zero set of the famous -hp- resistance-tuned oscillators. It is
Wide frequency range the first -hp- instrument of its kind to bring audio
No adjustments during operation frequency speed, accuracy and ease of operation to higher
Output voltage attenuator frequency fields. Its unique frequency range, 10 cps to 10 mc,
Self-contained vacuum tube voltmeter makes it ideal for a wide variety of measurements in audio,
High stability
supersonic, video and r-f bands. It is a wide-band, h i g h 5
Ease of operation stable precision instrument which provides output flat within
I db throughout its frequency range. Its voltage range is
USE IT FOR:
.00003 volts to 3 volts. Output impedance is 600 ohms. And,
Testing television amplifiers for measurements where low source impedance is desired, a
Wide- band systerns 6 ohm impedance is provided by means of an output voltage
Filter transmission characteristics divider.
Tuned circuit response
DECADE RANGES, OUTPUT VOLTMETER
Determining receiver alignment
Telephone carrier measurements Like other -hp- resistance tuned oscillators, the new Model
Bridge measurements 650A is fast and easy to operate. Six decade frequency ranges
provide an effective scale length of 94 inches. The tuning
dial is controlled directly, or with a 6 to 1 vernier micro-drive
14
for hair-line adjustment. Frequencies are read through a no- USES
parallax illuminated window.
Employing essentially the same resistance-tuned circuit as
The output voltage is monitored by a vacuum tube volt-
-hp- audio oscillators (see page 6 for description of the -hp-
meter which measures the voltage at the input to the attenua-
resistance-tuned principle) this wide-band, stable -hp- Model
tor system. The VTVM is calibrated in volts and decibels
650A is ideally suited for laboratory and production jobs
and reads actual output voltage when the attenuators are set
for zero attenuation. For other attenuator settings true output where fast, accurate wide band measurements are required.
voltage is obtained by subtracting the attenuator reading from It is specifically designed for the testing of television ampli-
the output voltmeter reading. The output attenuator is adjust- fiers, audio amplifiers, filter networks, tuned circuits and tele-
able in 10 db steps and maximum attenuation is 50 db. The phonic and telegraphic carrier equipment. I t serves admir-
voltage applied to the vacuum tube voltmeter and thus to the ably as a power supply for a-f and r-f bridge measurements.
output attenuator is set by means of an amplitude control.
S PECl FlCAT1ONS
The attenuated output voltage is correct only when the output
terminals are loaded with 600 ohms, resistive. Frequency Range: 10 cps. to 10 mc. Six bands.
Frequency Calibration: 1 to 10.
OUTPUT VOLTAGE DIVIDER MF Frequency Range
x10 c p s .. . ...., .... 10 to 100 cps
Where small test signals or a low source impedance is re- x100cps ........... 100 to 1000cps
quired, a voltage divider is provided (shown connected to xl kc. .......... . . 1000 to 10,000 cps
instrument in Figure 1 ) . The divider consists of a cable and x10 kc .. . .. . ., .. . . 10 to 100 kc
terminating connector which may be extended to the actual xloo k c . .. .... . ... . 100 to I O U U kc
point of measurement. Two sets of voltages are obtainable
xl mc .. .. . .., .. . . 1 to 10 mc
from this divider. One voltage is one one-hundredth of the Stability: +2%, 10 cps to 100 kc; + 3 % , 100 kc to 10
normal output voltage from the 650A and is delivered from a mc including warmup, line voltage, and tube changes.
source impedance of only 6 ohms. True voltage is obtained Output: 15 milliwatts or 3 volts into 600 ohm resistive
at these terminals when they are connected to a load resistance load. Open circuit voltage is at least 6 volts. 600 ohm source
large compared to 6 ohms. The second voltage is the actual impedance. Source impedance of 6 ohms is available when
output voltage of the Model 650A and is delivered from a voltage divider is used.
source impedance of 300 ohms. Proper voltage is obtained at
Frequency Response: Flat within +1 db, 10 cps to 10
these terminals when working into a load resistance large
mc into 600 ohm resistive load.
compared to 300 ohms.
Distortion: Less than 17~ 20 cps to 100 kc. Approxi-
from
ixately 5 % from 100 kc to 10 mc.
Output Monitor: Vacuum tube voltmeter monitors level
at input to attenuator, in volts or db at 600 ohm level. Zero
db= 1 mw in 600 ohms. Accuracy e 5 % of full scale read-
650 A OUTPUT VOLTAGE DIVIDER
ing.
Output Attenuator: Output level attenuated 50 db in
ATTENUATOR 10 db steps, providing continuously variable output volt-
from $12 dbm to -50 dbm, 3 volts to 3 millivolts, or down
10db steps
to 30 microvolts with voltage divider. Accuracy +1 db, into
resistive load of 600 ohms.
Figure
Hum Voltage: Less than 0.5% of maximum attenuated
signal level.
Bower Supply: 115/230 volts 50/60 cps. Consumption
Circuits of the -hp- Model 650A have been carefully pro- 165 watts. Plate supply and h-f oscillator tube filaments elec-
portioned and low temperature coefficient components have tronically regulated.
been employed to assure highest frequency stability. Output
Mounting: Cabinet or relay rack. Panel size 19" x 10Y2'',
voltage will remain constant over long periods of time,
Depth 13". Smooth gray finish.
despite wide variations in temperature. Distortion over the
low frequency bands is kept at a minimum to increase the Net Weight: 46 pounds. Shipping Weight: 100 pounds.
usefulness of the instrument for audio measurements. Data subject to change without notice.
15
MODEL404A
VVACUUM TUB E
VOLTMETER
(PORTABLE)
FOR GENERAL VOLTAGE MEASUREMENTS SPECIFICATIONS
WHERE AC POWER I S N O T AVAILABLE Voltage Range: 11 ranges: .003, .01, .03, .1,.3, 1, 3 , 10,
30, 100 and 300 volts full scale.
BETWEEN the frequencies of 2 cps and 50 kc, this light,
Calibration: Meter calibrated to read rms value of sine
easy to handle -hp- portable voltmeter provides highly wave. Linear voltage scale, also db scale reading from
accurate measurements in applications where an ac -62 to $ 5 2 dbm.
power source is not available. The voltage range is 0.001 to Frequency Range: 2 cps to 50 kc.
300 volts, amply broad for a wide variety of measurements Accuracy: t370 between 2 cps and 20 kc.
including remote broadcast line and carrier current checks, &7% from 20 kc to 50 kc.
strain gauge system tests, geophysical and telemetering cir- Input Impedance: 10 megohms, all ranges, shunted by
cuit measurements, and many others. In the laboratory it also approximately 20 ppf.
offers completely hum-free measurements of very low noise Meter Switch: Provides a large capacity across meter to
level, and may be used as a standard amplifier of 60 db gain. prevent needle flutter at low frequencies.
Amplifier: Switch removes meter from circuit, allowing
BATTERY-OPERATED balance of instrument to be used as a 60 db, t 5 db
gain amplifier. Maximum output voltage to open cir-
This convenient new -hp- portable voltmeter operates from cuit, 1 5 volts.
standard flashlight and 45 volt batteries. It is simple to Batteries: Filament: 5 No. 2 flashlight cells.
operate, requiring no adjustment during use. Voltage ranges Plate: 3 No. Z30NX Burgess or equal.
are selected with a single switch and no precautions are re- Battery life: 60 hours total, when used at rate of 4 hours
quired. The voltmeter is well protected against overloads up per day continuously.
to 100 times normal. The meter responds to the average Mounting: Welded dural case, gasketed cover.
value of a full wave. Waveform errors are minimized and Size: 71/2fr x lo$$'' x 9" deep. Net weight, including bat-
there is no turnover. Operation is virtually independent of teries, approximately 14 Ibs. Shipping weight 30 Ibs.
tube or battery aging, or external conditions. Data subject to change without tzotice.
16
VACUUM TUBE VOLTMETERS
and accessories for voltage,
current, or power measurements
VACUUM TUBE
SIGNAL SOURCE EQUIPMENT
VOLTMETER
FROM 2 cycles to 700 megacycles, there's an accurate, easy- saving case of operation. These -hp- voltmeters are used by
to-use -hp- voltmeter to fit every voltage or current meas- radio stations, manufacturers, research institutions and scien-
uring requirement. Y o u can choose from 5 precision tific laboratories the world over.
voltmeters (including a battery-operated portable instru- A complete -hp- line of voltmeter accessories is also pro-
ment) the one which precisely fills your measuring need. vided to appreciably extend the useful range of these instru-
Each will give you the familiar -hp- characteristics of high ments and to facilitate the measurement of current.
sensitivity, wide range, compact size, versatility and time-
VOLTMETERS
PRIMARY FREQUENCY VOLTAGE INPUT
INSTRUMENT PRICE PAGE
USES RANGE RANGE IMPEDANCE
-hp- 400A General purpose .005 to 300 v 1 megohm
10 cps to 1 mc $185.00' 18-19
measurement 9 ranges 24 uuf shunt
-hp- 400B
l o w frequency ,005 to 300 v 10 megohms $195.00 18-19
2 cps to 100 k c
measurements 9 ranges 24 uuf shunt
Wide range
,0001 to 300 v 10 megohms
-hp- 400C meosurements 20 cps to 2 mc $200.00 * 18-1 9
1 2 ranges 15 uuf shunt
High sensitivity
-hp- 404A Portable, battery ,0005 to 300 v 10 megohms
2 cps to 50 k c $1 85.00 16
operated 1 1 ranges 20 ppf shunt
Audio rf, VHF
-hp- 410A measurements; 0.1 to 300 v 10 megohms
20 cps to 700 mc $245.00 20-21
dc voltages; 7 ranges 1.3 uuf shunt
resistances
ACCESSORIES
Extend usefulness of -hp- Models 400A, B, C o 410A voltmeters
r
INSTRUMENT FEATURES PRICE PAGE
-hp- 452A Capacitive Voltage Divider For all -hp- ac VTVM. 25 cps to 20 mc. Division 1OOO:l $75.00 22
-hp- 453A Capacitive Voltage Divider For -hp- 410A V T V M only. Division 1OO:l $20.00 22
-hp- 454A Capacitive Voltage Divider For -hp- 400C VTVM only. Division 1OO:l $20.00 22
For -hp- 410A VTVM. Measures voltages between
-hp- 455A Probe Coaxial "T" Connector $35.00 22
conductor and sheath of 50 ohm transmission line.
For -hp- 410A VTVM. Measures volts at open end of
-hp- 458A Probe Coaxial "N" Connector 50 ohm transmission line.
$17.50 22
For -hp- 410A VTVM. For measuring high dc voltages
-hp- 459A DC Resistive Multiplier $20.00 22
safely. Multiplies 1:lOO
470A-$7.50
-hp- 470 A-F Shunt Resistors For 400A, B, or C VTVM. For Measurement of current. 22
4708 thru F-$6.00
'Available in rack mounting at $10.00 extra. Doto Subject to Chonge Without Notice. Prices f.0.b. Palo Alto, California.
17
8 8 MODEL 4 0 0 C
V ACUUM TTUBE E
VOLTMETER T
FAST, ACCURATE MEASUREMENTS
BETWEEN 20 CPS A N D 2 MC
ADVANTAGES:
Wide voltage range. High sensitivity TODAY, the vacuum tube voltmeter is the most important
Hairline accuracy. Time saving stability
basic tool of electronic research, development or pro-