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PALO ALTO, CALIFORNIA, U. S.
-hp- 205AG 3 High power tests, gain measurements 20cpsto20kc 5 watts 425.00 20,21
4p- 205AH
I High power supersonic tests Ikcto100kc 1 5 watts 1 550.00 1 20,21
i +- 206A I High quality. high accuracy audio tests 1 20cpsto20kc I + 15 dbm i 550.00 [ 2a
2,
-hp- 230A Carrier test oscillator 35 cps t 35 kc
o 1 +14dbm/6Wohms j 275.00 ! I4 1
- h p 233A 1 Carrier test oscillator 1 50cpsto5OOkc i )w/MOohms 1 475.00 1 ~ IS
1 1
1 -hp- 234A
L - - - - - - - - . " . -range video tests-
- -hp-650A - , - - - - -Wide
- - - -
4
Carrier test oscillator
E
16Ocpstol6Okc
!cp5~10mc
+14dbm/MOohmr
- -mw/*
1- 15. - .
.
0.0
300
I -_---.I___---
7.0
450 1
I4
16, 17 _ d
_
---
Vacuum Tube Voltmeters
-l___l--__l_._l______.___
-2 cps to 700 mc
I*- -
1 1-
-
Insta-mmont t Primary U r s i koqucacy Ronqc I Voltaqo Rango i laput Impodancc Mw j page i
1 -hp-400A 6eneral purpose ac
measurements
0.005 to3OOv
9 ranges ,
I moqohm
24wpfd shunt 1 sles*OO I 35
-
I -hp- 453A Capacitive Voltage Divider For -hp- 410B VTVM only Division 1W:l 2.0
00 39
I I
-hp- 454A Capacitive Voltage Divlder For -hp- 400C VTVM only. Division I W I 20.00 i 39 I
~-
For -hp- 410B VTVM. Measures voltages behveen conductor i
' -hp- 455A Probe Coaxial "l" Connector and sheath of 50 ohm transmission line. 35.00 I 39
I
-hp- 458A Probe Coaxial "N" Connector For -hp- 410B VTVM. Measures volts at open end of
50 ohm transmission line. 17.50 39
-hp- 459A DC Resistlve Voltage Multiplier For -lip- 410B VTVM. For measuring high dc voltages
safely. Multiplies I:IM) 20.00 39
-hp- 470 A-F Shunt Resistors
_- I_ . . . ...
For 400A. 11, or C VTVM. For measurement of current.
"__.,I_I .
. , . ._ " , .. . -. .,
. . ,
-
470A- 7.50
47011 F - 6.00
. .__
3T
. . . . . I
Data subject to change without notice. Prices f.0.b. factory.
Copyright 1952 Ami&-Packard CO.-Printed in U. S. A.-2373 9-52 35M
Registered Trademark of the Hewlett-Packard Company.
EX B Y INSTRUMENT TYPE AND FUN^
. .- .
Signal Generators - 10 to 10,000 me
I O to 400 mc
I
Output 3.0 fiv to 0.223 v into 50 ohm load.
Pulse, FM or Square wave modulation.
Separate power meter and wave meter section.
. I - - _ -. __ - _ _ _ - l - l l l - l _ l - I __ -
ion, Wave Form Analyzers
.-I _-^-^."-.
- 20--cps to 20 k - -
- -
t
".----_I I I_I _ -
G Frequency Range I Characteristics
Wave form analyzer 30 cps to 16 kc
i
400cpsand5kc Requires external detector
Measures total
Same as above
m CPS to 20 kc Includes input amplifier, VTVM
~
For FM broadcast 20 cps t o 20 kc
measurements
' -bp- 330D ; Far AM, FM broadcast 20 cps t o 20 kc A M detectorandVUmeterto ~ 440.00
! measurements meet F.C.C. requirements
i
e Square Wave Generator i
i Transient and Output 50 v Wak-to-peak. 3 0 1
150.00
f -hp- 2I0A - I -
frequency response m CPS to IO kc - 1,000 ohm impedance
I -I
i
Waveguide Test Equipment -2.6 to 18.0 kmc
"S" "0" "J" "H" "X" "P"
Instrument 3" x 1%" 2" x 1" 1'/2'' X %" 1%" X %" 1" X '/a" .702" I .391" Page
Tm Con"*
N. 2.6-3.95lune. 3.95-5.85 kmc. 5.85-8.2 kmc. 7.05-10.0 kmc. 8.2-12.4 kmc. 12.4-18.1 kmc.
j Adaptors, Waveguide to Coax S281A $75.00 G281A $55.00 J281A $50.00 H281A $45.00 X281A $35.00 75
#
Cover to choke flange
Attenuators, Fixed 6, IO. 20 d b S370 $75.00 G370 $65.00 J370 $65.00 H370 $60.00 X370$55.00 P370 $60.00 77
Flap, 25 d b max. S375A $75.00 G375A $65.00 J375A $60.00 H375A $55.00 X375A $50.00 P375A $55.00 n
Calibrated S380A $225.00 n
Detector Mounts 440A $85.00 S 4 8 5 A $125.00 G485B $95.00 J485B $90.00 H485B $85.00 X485B $75.00 90.80
Frequency Meters, Reaction J530A $120.00 H530A $120.00 X530A $120.00 81
Dir. Couplers, Cross Guide: 20, 30 d b S750 $100.00 6750 $85.00 J750 $70.00 H750 $60.00 X750 $50.00 82.83
Dir. Couplers, Multi Hole: IO, 20 d b S752 $210.00 6752 $170.00 J752 $140.00 H752 $120.00 X752 $100.00 m,83
Slotted Sections, Waveguide S810A $450.00 G810B $90.00 J810B $90.00 H810B $90.00 X810B $90.00 P810B S90.W 88, 89
Waveguide Tees, Series S840A $60.00 G840A $50.00 J840A $40.00 H840A $35.00 X840A $30.00 P840A $35.00 91
Shunt S841A$60.00 G841A 550.00 J841A $40.00 H841A $35.00 X841A $30.00 P841A $35.00 91
Hybrid S845A $90.00 G845A $75.00 J845A 560.00 H845A $55.00 X845A $45.00 P845A $55.00 91
Transformers, Slide Screw S870A $150.00 G870A$140.00 J870A $135.00 H870A $130.00 X870A $125.00 P870A $130.00 92
E-H S880A $175.00 G880A $155.00 J880A $145.00 H880A $135.00 X880A $130.00 P880A $135.00 92
Terminations, l o w Power S910A $45.00 G910A $40.00 J9l0A $35.00 H910A $30.00 X9l0A $25.00 P910A $30.00 93
Terminations, High Power S912A $125.00 X912A $75.00 93
Moving Load S914A $80.00 G914A $70.00 J914A $60.00 H914A $50.00 X914A $40.00 P914A $50.00 W
Adjustable Shorts S920A $80.00 G920A $70.00 J920A $65.00 H920A 160.00 X920A $50.00 P920A $55.00 W
Broad Band Probe 442B $50.00 All Frequencies 90
Broad Band Probe, Untuned 444A $50.00 All Frequencies 90
Waveguide Clamps, Stands 95
t F o r use wlth bolometer o r crystal .For use wlth bolometer only 'Complete assembly lncludlng carriage Mounts In 809B carriage - See next page
M TS
Suggestions for Ordering
Order by Model Number. .. Always order by Terms .. . 30 days net. Unless credit has already
catalog model number and name of instrument de- been established, shipments will be made c.0.d. All
sired. For example, "Model 206A Audio Signal prices are quoted f.0.b. Palo Alto.
Generator." Whenever possible mention frequency
range or other significant specifications to prevent
Sales Representdives ... Sales representatives
are maintained in principal cities as a service to our
misunderstanding. Also mention features such as
customers. Customers are invited to contact the near-
special color, frequency range, non-standard power
est representatives at any time. They will gladly
line voltage, etc., and whether cabinet or rack mount-
supply technical information, help prepare your
ing style is desired.
order and, if desired, forward order to the factory.
Most Hewlett-Packard instruments are available Orders should be made out to the Hewlett-Packard
in either cabinet or rack mounting. T h e letter "R" Company and are subject to final acceptance by the
after the model number indicates rack mounting. For Company in Palo Alto. Sales representatives and
example, "206AR." An additional charge of $5.00 their addresses are shown on the back cover.
is made for most rack mounting style instruments.
Repairs ... When returning instruments for re-
Orders should be sent direct to the factory and pairs, recalibration, or any other reason, please con-
addressed to Hewlett-Packard Company, 395 Page tact the Hewlett-Packard Company for shipping in-
Mill Road, Palo Alto, California. All orders are structions. Give model number, type number, and
subject to final acceptance by the Hewlett-Packard serial number and as much information as possible
Company. concerning reason for return.
Repairs are made by the Hewlett-Packard Com-
. .
Shipments . Unless specifically requested other-
pany at cost of labor and materials plus a small serv-
wise, shipments are made by express. This policy is
ice charge. Customers are invited to make full use
born of experience. Delicate instruments require the
of this service to insure maximum benefit from their
careful handling received in express shipment, and
instruments.
over a long period of time ,this method has proved
most satisfactory. On request, shipments will be made Repair Paris ... When ordering repair parts
by air freight or by truck. W e do not recommend please describe carefully parts required. Give model
shipment by parcel post or by freight, and shipments number, type number, serial number of the instru-
will not be made by this type of carrier without ment and date of original purchase. Identify parts of
specific instructions from the customer and the un- the wiring diagram if possible, giving date shown
derstanding that safe arrival is his entire risk. on the circuit wiring diagram.
Bigger, better engineering and
manufacturing facilities
In the past five years, the increasing demand for Both production and engineering have benefited
-hp- instruments has made necessary two plant ex- from these additions. T h e engineering staff has
pansions a t -hp-. I n 1948 and again in 1951, new been tripled during recent years, and productive
concrete structures of advanced design were added capacity has been increased 600%. Hewlett-Pack-
to the existing plant. ard now employs over 600 men and women.
T h e Hewlett-Packard Company is located in Palo Francisco, or from San Francisco Municipal Air-
Alto, California, 30 miles south of San Francisco. port, to Page Mill Road, Palo Alto.
T h e plant may be reached by Southern Pacific By auto: Drive south from San Francisco on
commuter trains, ,Greyhound bus or automobile. U. S. # 101 Alternate, ( Bayshore Highway) ;
By train: Take commuter train from Southern turn right on Oregon Avenue (1.3 miles south of
Pacific station, San Francisco, to South Palo Alto Palo Alto intersection) ; drive to S. P. railway
station. Plant is a five-minute walk from station. tracks; drive left one-half block to Page Mill
+
-
By bus: Take San Jose-bound Greyhound from Road ; then turn right across tracks and proceed
Seventh and Mission Streets T e r m i n a l , San three blocks to -hp- plant.
1
often say that when you can measure what you
are speaking about, and express it in numbers, you know
something about it; but when you cannot measure it,
when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind; it may be the
beginning of knowledge, but you have scarcely, in your
thoughts, advanced to the stage of science, whatever the
matter may be."
LORD KELVIN. 1883
SPEED AND ACCURACY ARE INTEGRAL PARTS OF EVERY -hp- INSTRUMENT
EW ease and sureness in all types of laboratory and production
testing are made possible by the use of - h p - instruments. Although each is tai-
lored for very specific jobs, - h p - laboratory instruments have certain outstand-
ing "family" characteristics. No zero setting, little or no adjustment during op-
eration, 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
- h p - line.
- h p - instruments are essential and versatile tools in the fields of television, fre-
quency modulation, radar, industrial heating, communications, carrier cur-
rent, equipment manufacture, experimental work, broadcasting, industrial
testing. H e r e is a partial list of the measurements that can be made with
standard - h p - instruments : distoition, frequency, gain, voltage, power, imped-
ance, network response, harmonic analysis, amplifier frequency response.
They are also useful in measuring receiver and transmission line character-
istics, radar performance and many other parameters. Let - h p - instruments,
products of sound engineering and precision manufacture, solve your test-
ing and measuring problems.
4
L
0S C ILLAT 0R S
are among the
OSCILLATORS signed to generate frequencies below 1
most basic and useful of all cps and over 1 mc. T h e low frequency
electrical a nd electronic signed to operate ovcr wide frequency limit is set by the ballast element.
measuring instruments. T he y provide ranges and to provide gmerous output I .
1he thermal time-constant of the lamp
a convenient source of power or test voltages. Others arc designed for par- (ballast elcnimt) is such that at lower
voltages for almost all measurements, ticular applications. frequencies, lamp resistance tends to
including frequency, gain, impedance, r .
1 he circuit of the - h p - RC oscillator change in accordance with the varia-
distortion, etc. is shown in Figure 1. I t is fundamen- tions in amplitude of the individunl
'I`het-c are thrcc primary types of tally a tnwstage amplifier having both cycles of operation. This results in se-
oscillators. These may be defined as negative and positive feedback loops. vere distortion of the output wave-
( 1 ) Beat-Frequency, ( 2 ) Coil Con- T h e positive loop. Ivhich includes the form. Therefore it is necessary to ( 1 )
denser or LC and ( 3 ) Resistance Ca- frequency - srlective network. causes use a ballast element having relatively
pacity or RC oscillators. the circuit to oscillate. 'I`hc resonant greater thermal inertia, or ( 2 ) oper-
f requency is given by the expression ate the lamp at a point where radia-
Throughout the years, the K C os-
I , tion from the lamp is low.
cillator has become recognized as the f -- I`his expression shoLvs
"-2 T; RC.
most versatile, practical, dependable that the frequency or tuning span can High Frequency Oscillators
and easiest to m e of all oscillator be made as wid? as the capacity varia- T h e high frequency limit of the
types. Hewlett-Packard pioneered and tion in a tuning capacitor. l'hus 10: 1 RC oscillator is determined by the
developed the RC oscillator, and is
today the leader and largest manufac-
turer of this superior type of instru-
ment. -hp- RC oscillators are highly
stable, have wide frequency range and --*
provide operating flexibility which OUTPUT
makes them useful for many different
kinds of measurements. T he y are ex-
tremely simple to operate and require
no tedious re-setting o r adjustment
d u r in g operation. T h e y a r e l i ght -
weight, easily portable, and conipact -
& CI=C2=G -
I-
in size to occupy a minimum of bench RI=Rz=R
space. Dependability of operation is
assured by clean, simple circuitry and
painstaking construction from quality
components. frequency variations in a single sweep plate loading on the second tube of
r 7
are easily obtained, and a number of the oscillator. T h e impedances of the
1 hese ma n y advantages may be bands can be used by changing the positive and negative feedback loops
compared with the low stability, coli- pairs of resistances. l'he negative loop are in parallel and the combination i5
stant need for adjustment, narrow employs a non-linear ballast resistance in parallel with the plate feed resistor
frequency range, inflexibility. large K, (usually a lamp), which automat- for the tube. A t high frequencies, the
size and considerable weight of other ically adjusts its resistance to compen- combination impedance becomes low
oscillator types. sate for variations in output amplitude. and reactike, thereby reducing the
T h e -hp- series of oscillators in- This results in very flat frequency re- gain of the circuit and introducing
cludes 13 separate instruments which sponse and low distortion over the en- phase shift. As a result, the distortion
are essentially resistance-capacity os- tire range. It, also, reduces distortion increases and the errors in calibration
cillators. Collectively. they operate and limits amplitude of oscillations, become severe. T o cut down the plate
in:;uring a constant and stable output
from 0.01 cps to 10 mc, covering the loading effect, the combination imped-
over the entire range (Figurr, 2 ) .
audio, sub-sonic, ultra-sonic arid low ance is made as high as possible. This
rf regions. A number of these instru- Low Frequency Oscillators is achiebed partially by reducing the
ments are general-purpose types de- - h p - RC oscillators have been de- capacity of the tuning condensor, and
5
partially by raising the gain of the monic distortion generated by one
second stage (through use of tubes tube of the oscillator is partially can-
with higher transconductance values). celled by the other tube's transfer AUDIO OSCILLATOR
At higher frequencies the reduction characteristics.) For applications re-
of gain and negative feedback makes quiring very low distortion, a selective Figure 4. Voltage Divider Circuit.
the oscillator more susceptible to drifts amplifier following the oscillator can
or variations caused by tube aging and be used. stability, resettability of the tuning
supply voltage changes. As a result it Hum system, readability of the tuning dial,
is common practice to operate the cir- dial calibration, component aging,
H u m is defined as alternating cur-
cuit from a regulated power supply. power supply variations and tempera-
rents appearing in the output of an
All -hp- oscillators use an output oscillator as a result of power-fre- ture changes. Some of these factors
amplifier whose main function is to quency voltages, currents and fields. affect short time stability; others af-
isolate the oscillating circuit from the Causes of hum are stray electrostatic fect long time stability. T h e accuracy
"work" circuit. Thus, change in the and magnetic fields, alternating cur- specification of within 2 % usually
work circuit does not reflect back to rent in tube filaments or heaters, and given for R C oscillators includes all
the oscillator and alter its amplitude, discrepancies in filtering of power of these factors. (Typical long time
frequency or distortion characteristics. supplies. and short time stability are shown in
As the output volt- Figures 5 and 6.)
DISTORTION AND AMPLITUDE CHARACTERISTICS
OF RESISTANCE-CAPACITY OSCILLATOR age of the audio oscil- Description of -hp- Oscillators
lator is reduced, the
-hp- 200 series Oscillators (see page
hum voltage tends to
8 ) are designed for general-purpose
remain constant. A t
I - applications, such as checking per-
-1 lower output levels
I
- formance of audio amplifiers, broad-
$ -2 this hum voltage be-
cast transmitters and similar equip-
comes quite large rela-
ment, checking vibration and stability
1 tive to the sine wave of mechanical systems, and as voltage
Z output voltage. This
I-
02
- undesirable condition
sources for bridge measurements, etc.
T h e output is sufficient to modulate
0.1
can be remedied by signal generators a n d drive other
10 operating the R C os- equipment requiring considerable pow- !
FREQUENCY IN C.P.S. cillator at or slightly er. T h e usefulness of these oscillators
below rated output, is greatly increased by their compact
and inserting a suit- size, light weight and easy portability.
able attenuator be- -hp- 200H is a single-enhed oscillator
However, this built-in output ampli- tween the oscillator and the equip- designed for carrier communications
fier introduces some limitation of fre- ment driven. T h e "voltage divider" network and equipment tests. -hp-
quency range. circuit shown in Figure 4 is satisfac- 2001 is especially suitable for inter-
For audio work where high power tory for most applications. Other val- polation work and for applications
is desirable, a transformer output is where the frequency of oscillation
employed. For wide-range oscillators, must be known very accurately.
extending into supersonic frequencies,
-hp- 650A (page 16) provides the
resistance-coupled output systems are widest range of any of the general-
generally employed delivering some- purpose oscillator group. It operates
what less output power. up to 10 mc and down to 10 cps. I t is
Figure 3. Characteristics of Frequency
Distortion Determining Network. designed with an output voltage me- i
Inherently, the RC oscillator is a tering system followed by an adjust-
ues of resistance may be used to ob- able attenuator. I n these respects, the
generator of low distortion voltages.
tain different voltage divisions but in instrument resembles a signal genera-
Distortion depends upon the linearity
of the transfer characteristics of the all cases the sum of the divider resist- tor. As a basic laboratory tool, the
ance must equal the rated load. 650A is popular because of its high
tubes. By a suitable selection of tubes,
distortion in -hp- oscillators is approxi- degree of flexibility. It can be used to
mately %. T h e very low distortion Accuracy test rf, video, ultra-sonic and audio
obtained is primarily third harmonic. "Overall accuracy" as applied to a equipment.
(Second harmonic distortion is mini- variable-frequency oscillator is a gen- -hp- 202A Low Frequency Func-
mized by adjusting the dc voltages on eral term including factors such as tion Generator (page 10) incorpo-
the tube electrodes so that second har- inherent circuit stability, mechanical rates a circuit concept developed by
6
modulated by a standard telephone
set, thus permitting voice communica-
tion between the test point and ter-
minal. I t also provides a single-ended
output and includes a large tuning
-0.1
dial that gives a high resolution and
a convenient arrangement for stand-
0 15 20 25 30 35 40 45 60
DAYS ardizing calibration.
-hp- 230A and 234A are low-power
Figure 5. L o n g t i m e Stability Curve of circuit using wire-wound resistors an d
temperature compensation. oscillators also designed for carrier
and similar test work.
HOURS
I I
FREQUENCY
Figure 6. Short-time Stability Curve of RC Oscillator. Figure 8. Typical distortion characteris-
tics of 912-17 Line Matching Tran5-
former operated a t -t 1 5 dbm.
- h p - and new to the low frequency -hp- 204A (page 18) is a battery-
oscillator field. l ' h e instrument's nom- operated oscillator, used in a variety -hp- 912-1 7 Line Matching Trans-
inal low frequency limit is 0.01 cps of applications requiring a self-cori- former. Many -hp- oscillators are
and it can generate sinusoidal, square tained instrument. This unit is useful pro\ ided with a single ended output
a n d t r i a ng u 1a r o u t p u t waveforms. not only in field applications, but also system in which one of the output
T h e circuit design of this instrument
is such t h a t t ra nsi e nt con di t i o n s
caused by range switching o r frequen-
cy changing are virtually non-existent.
r 7
1his is of considerable convenience
in low frequency work where much
time is required for ordinary circuits CONNECTIONS FOR HP MODEL 200AB A U D I O O S C I L L A T O R
to stabilize. Figure 7. Typical .et-up using -hp- 912- Figure 9. Set-up for using -hp- oscillators
17 Line Matching Tr an sf o r mer to match as audio signal generators.
-hp- 202D (page 9 ) and 202B single-ended oscillator to balanced system.
(page 13) are RC type low frequency
oscillators. Applications of these in- terminals is grounded. T o permit these
when tests must be made in different
s t r u me n t s in c 111 de ge o p h y s i c a 1 an d oscillators to be used with balanced
parts of a factory, or where power
medical work, and the study of servo outlets are not available. A battery- systems, a special balanced universal
and other low-frequency electrical and operated oscillator is also valuable in matching transformer is available as
mechanical systems. the laboratory when a completely hum separate -hp- accessory. This trans-
free signal is required. former, -hp- 912-17, is a high-quality
In audio work there are a number device with low distortion, a wide fre-
of applications that require test volt- -hp- 230,233,234 Oscillators (page quency range, and good balance. Its
ages with unusually low distortion. 14) are widely used in testing carrier- frequency response is 3 db from 20
Although -hp- RC oscillators are im communications equipment. T h e out-
cps to 20 kc with less than 1% distor-
lierently low-distortion generators put system of these instruments is
tion at 20 cps. Maximum rated power
(with usually less than 1% distor- balanced, thus permitting operation
t i o n ) - h p - 201B Audio Osc i l l a t or level is 15 dbm. T h e transformer is ar-
directly into balanced lines. Model
(paye 12) has less than 0.576 distor- 233A is a versatile unit and includes ranged to match 600 ohms to imped-
tion at power levels u p to 1 matt. man\- features that make it suitRble ances of 600, 250, 150, 62.5 or 37.5
Modrl 201B has an accurate and COII- for testing and adjusting the most ad- Ohms, and 500 Ohms to
lenient method of frequency control lanced tjpes of carrier equipment. It 500,208, 125, 52 or 32 ohms. Corn-
and is particularlr suited to high-fidel- uies an internal modulator which al- plete aliplication data is supplied with
ity audio work. lows the generated frequency to be each unit. Price, $25.00.
7
AUDIO
OSCILLATORS
MODEL 200
NEW! COMPLETELY REDESIGNED
HIGHEST QUALITY THROUGHOUT!
RC
EWLETT-PACKARD oscillators have long been
basic tools for making electrical and electronic
measurements of precise accuracy. Now these
world-famous test instruments are redesigned
to give you the most compact, dependable, accurate and
easy-to-use commercial oscillators available.
ADVANTAGES: New -hp- 200 series oscillators have highest stability
and precisely accurate, easily resettable tuning circuits.
No zero setting. High stability Low impedance operating levels together with superior
Constant output insulation guarantee peak performance throughout years
Wide frequency range of trouble-free service. New models have wider frequency
Logarithmic scale range and longer dial lengths than previous -hp- oscillators
and feature an improved, vernier frequency control. Opera-
Low distortion tion is simplified-just three controls are required. Size,
Compact, light weight too, is different-instruments are more compact, lighter in
weight and enclosed in a convenient, smaller aluminum
case with carrying handle. They occupy minimum bench
USE THEM FOR: space and are easily portable. (Rack mounting available %
on order.)
Amplifier testing T h e total coverage of just two of the new -hp- oscillators
Transmitter audio response is materially greater than that offered by four previous -hp-
1
Voltage source for bridge measurements instruments. For example, new Model 200AB, for general
audio tests, offers a wider frequency range of 20 cps to 40
Modulating signal generators
kc and a full watt output. New -hp- 200CD, for wide-
Supersonic voltage source range measurements at lower power, provides constant
Driving mechanical systems voltage output from 5 cps to 600 kc.
Synchronizing pulse generators In addition to these new instruments, -hp- continues to
offer Model 200H for carrier current work up to 600 kc,
Loudspeaker resonance tests and Model 202D for low frequency and vibration studies
down to 2 cps. These instruments retain their time-tested
design.
8
-hp- 2001 INTERPOLATION OSCILLATOR
Model 2001 is a band-spread oscillator with an ex-
tremely accurate tuning system. It is designed for inter-
polation work, frequency measurement and other applica-
tions where the oscillation frequencies must be compared
with precise accuracy. Its frequency range is 6 cps to 6 kc.
Response is *1 db throughout range, and distortion is
less than 1% above 10 cps. T h e instrument delivers 100
mw or 10 volts into a 1,000-ohm load and frequency may
be standardized with an accuracy of 1%.
SPEC IFlCAT1ONS
-hp- FREOUENCY BANDS FREOUENCY POWER LOAD POWER PRINCIPAL WEIGHT, LBS. CABINET
MODEL RANGE RESPONSE OUTPUT IMPEDANCE DISToRT1oN
CONSUMPTION APPLICATIONS NET SHIP SIZE [IN.!
2 0 cps IO 4 + 1 db 1 wott or 600 60 Audio
200AB 1 "/. 15 20 1O~/*x7x1O1/~
4 0 kr ronger Ref. 1 kc 24.5 v ohms watls Terk
5 cps 160 mw - 600 ohms
200CD to
5 4 1 db 75 Audio, ultra-
or 1% 15 20 103/ax7x10%
ranges Rcf. 1 kc walls sonic, tesls
600 kc 2 0 volts open circuit'
1 %, 100- Corrier
60 cps 4 - 1 db
i lOmw
100 100,000 cps 115 Currenf &
200H to or 23 37 17x8%x10%
decodes Ref. I kc ohms 3 7- 60-
, WOtIS Telephone
600 kc I "
600,000 cps Tesfs
2 cps 100 m w
202D to
5 +
~~ I db or
1,000 80 Low frequency
ronger Ref. 1 kc ohms 1% wotts measurement
27 42 17x8%xIO%
7 0 kc I O V
Interpolation
6 cps 1db
6 l00mw and
200L to
6 Ref. Or
1,000 1 "/. I I5 26 39 I7x8'/ixlO%
ranges ohms 10-6.000 cps wott'. frequency
6 kc 400 cps 10 v meosuremfrit
A d d i t i o n a l Specifications, all M o d e l s
Frequency Stability: Under normol condilions, drift i s less than 4 2 % including warmup. tine voltoge variations as high os 1 IO v change frequency less than 0.2%.
No zero setting required on any model listed obove. On -hp- 2001 a c w r o c y i s better l h o n 1 % when ranges ore stondordized occorionolly.
Hum V o lta g e : Less than 0.1 7- of rated output.
P o w e r Supply: 200AB. 200CD. 202D - 1 15 Y 2 IO v, 50 60 cpr. 200H. 2001-1 1 5 / 2 3 0 v I 1 O%, 50 '60 cps,
('Internal impedance 600 ohms.)
D a t a subject t o change without notice.
Main tuning dial of -hp- Model 200I a band spread oscillator Main tuning dial o f -hp- Model 200AB is calibrated over
designed for comparison work. T h e dial is calibrated over ap- approximately 300" a n d has a n effective scale length of about
proximately 300" with effective scale length of about 90 inches 60 inches. T h i s precisely calibrated dial with its easy-to-use
and range of 6 cps to 6 kc. Each instrument is carefully hand- control contrihutes much to the accuracy an d convenience of the
calibrated for maximum accuracy. wide-range Model 200AB oscillator.
9
y
LOW FREQUENCY
FUNCTION
ADVANTAGES:
GENERATOR
No transient response
Range 0.01 to 1,000 cps
Continuously variable M 202A
High stability
Flat frequency response
Distortion less than 1%
Sine, square, triangular waves TRANSIENT- FREE VOLTAGES
Versatile, multi-purpose DOWN TO 0.01 CPS
H E new -hp- Model 202A Low Frequency Func-
USE IT FOR: tion Generator is a compact, convenient, multi-
Vibration studies purpose source of transient-free test voltages at
Stress and strain studies very low frequencies.
Servo applications T h e equipment is continuously variable through 5 bands
Medical research covering all frequencies from 0.01 cps to 1,000 cps. It
offers exceptional stability and distortion of less than 1%.
Geophysical problems
Any of three desired wave forms-sine, square or trian-
Subsonic, audio testing
gular-may be instantly selected on a front panel switch.
Output is high-30 volts peak-to-peak-for all three wave
forms.
10
NEW CIRCUIT CONCEPT SPEC1FlCAT1ONS
-hp- 202A differs from conventional low-frequency oscil- Frequency Range: 0.01 to 1,000 cps in five decade
lators in that the sine wave is electronically synthesized. ranges.
A controlled bi-stable circuit generates a rectangular wave. Dial Accuracy: Within 2%.
This wave is passed through a special integrator providing
Frequency Stability: Within 1"/o including warm-up
a true triangular wave. (See Figure 2A.)
drift.
T h e triangular wave then enters a shaping circuit de-