Bruel Kjaer 1049, 1051 product data

product data

types 1049 and 1051

Sine/Noise Generators

USES:

Precision ATE signal generators for use in
computer based test systems, requiring a high
accuracy, low distortion excitation source

Semi and fully automatic test and calibration of

electrical and mechanical equipment for product
design, development, production and service

Swept-frequency electro- and building-acoustic
measurements; vibration testing of mechanical
components; plus audiological research etc.

Storage of amplitude weightings for equalizing
flat loudspeaker, vibration exciter responses etc.

Remote control of Level, X-Y and Graphic
Recorders for synchronous recording of ampli­tude, phase and distortion responses

FEATURES:

n

0,2

to 200000 Hz, sine generators with frequency

resolution down to 1

mHz

and clock stability

better than

n

Calibrated output from 100

than -96

n

Six-decade frequency sweep in one continuous

dB

harmonic and spurious distortion

to 5V with less

range with selectable lower and upper limits

non-

Choice of linear and logarithmic frequency sweep
with sweep rates from 0,001 Hz to

and 0,001

mDec

to 2

Dec/s

respectively

999,9

kHz/s

Single, repetitive (l-99) and continuous sweep

modes with

0,O1

to

100,0

s pause between sweeps

1024 point amplitude memory, with automatic
amplitude interpolation, for preconditioned test
excitation

40 character, alphanumeric, line display for moni­toring and setting-up of frequency and amplitude
sweep parameters etc.

9 set-ups for recalling frequently repeated excita­tion test and measurement sequences

Versatile IEEE/IEC bus for remote control and
digital output of data

ADDITIONAL FEATURES 1049:

n

Narrow-band random, white and pink noise modes

n

Logarithmic amplitude sweep with sweep rates

from

0,O1

to 999

n

118 dB compressor circuit for active control of

dB/s

sound or vibration level at exciter output

n

Automatic learn mode for amplitude memory, via

compressor

The B&K Types 1049 and 1051 are
two microprocessor-based sine genera­tors which combine today’s needs of
increased spectral purity, frequency
resolution and stability with ease of
use and versatility. Their wide fre­quency coverage from

kHz,

200
frequency resolution of
1
merous applications in electronic engi­neering, as well as in acoustics and
vibration measurements. Linear and
logarithmic sweep ranges, each with
their own user-presettable lower and
upper limits may be chosen, including
extended linear sweeps from 0,001 Hz
to 200
tinuous sweep modes are also included
and the time for each individual sweep
is automatically calculated and dis­played.

BP 0587-14

with amplitude linearity and

mHz,

make them suitable for nu-

kHz.

Single, repetitive and con-

0,2

Hz to

0,05 dB

and

Speeder

r------

LOG sweep

_

Line Display

Front Panel Controls

Control

1

I tt

Fig. 1. Simplified block diagram of the B&K Sine/Noise Generator

Outputs levels from 100

5

V RMS may be chosen to 3 digits,

Inout

Narrow Band White and Pink

to

permitting either a constant amp­litude or an amplitude-weighted, fre-

IEEE/IEC system controller is used
for automatic control of the Genera­tors, they may be coupled with a digi­tal plotter.

Attenuator

quency sweep to be obtained. With
the latter up to 1024 amplitudes may
be stored, which enable the Genera­tors to simulate the output of record
reproducer pick-ups, tape heads and
electrical circuits etc. Also, equaliz­ation characteristics can be stored for
maintaining a constant sound pressure
or vibration output with loudspeakers
and vibration exciters.

In addition to the above, the Type
1049 has a number of extra facilities.
These include a logarithmic amplitude
sweep, as well as narrow-band ran­dom, white and pink noise outputs.
Also, a compressor circuit is built in as
an alternative means of obtaining a
constant sound or vibration level out­put when a loudspeaker or vibration
exciter is employed with the genera-

All functions and parameters may
be selected or entered by the front
panel

pushkeys

or via the IEEE/IEC
digital interface bus of the Generators.
In addition, there is an analogue
“speeder” knob for fast and precise
continuous adjustment of parameters.

tor. In this case, however, external
feedback is employed to provide ac­tive regulation of the generator output
which has the benefit that it automati­cally takes into account the response
of the exciter under actual test condi-

tions.
Front panel set-up conditions are in­dicated on a 40-character line display,
from which as many as four functions

Description

and their individual parameters may
be monitored simultaneously.

A simplified block diagram of the

B&K Generators Types 1049 and

If desired, nine sets of front panel
set-up conditions may be stored and
instantly recalled for performing fre­quently used excitation test and mea­surement sequences, as is normally
called for in service and production
testing of products. For automatic
plotting of swept-frequency measure­ments and analyses, special provision
is made for synchronizing level and
Y recorders. Alternatively, where an

1051 is shown in
main sections, namely a Master Clock,
a Digital Frequency Synthesizer, a
Phase Lock Synthesizer, a Sweep Syn­thesizer and an Output Section, all of
which operate under the guidance of a
Microprocessor Section which takes
care of the user communication via

front

the
IEEE/IEC interface of the Genera-

X-

tors. In addition, Type 1049 features a

Fixed

Bus

ten /Amp

I

Noise

Type

1049 and Sine Generator Type 1051

Fig.1.

They have 6

panel

controls

I

and

Variable

A

Generator

Noise Generator and Compressor,
which greatly increase its range of
applications, especially for acoustic
and vibration measurements.

Frequency Synthesizer

The Generators employ a

hetero­dyne synthesis technique where a
500

kHz

fixed frequency is mixed with

a 500 to 700

kHz

variable frequency to
produce an 0,001 Hz to 200
swept-frequency,

sine-wave output
with frequency resolution of 1
The 500

kHz

fixed frequency is ob­tained from a Master Clock, while the
500 to 700

kHz

variable frequency is
derived from the 5 to 7 MHz output of
a Phase Lock Synthesizer.

The Master Clock is based on a sta­ble 10 MHz crystal oscillator whose
relative accuracy is transferred to the
output frequency. If an even greater
accuracy is required the internal osc­illator can be phase locked with an
external reference which may be cou­pled to an External Synchronization

i

Chassis

Fig. 2. External Synchronization Input of

the 1049 and 1051 Generators

kHz

mHz.

2

Input socket on the rear panel. See
Fig. 2.

For a 5 to 7 MHz variable frequency
proportional to the generator output
frequency, a 31 bit frequency control
output from the Sweep Synthesizer is
utilized. To achieve a wide sweep
range while maintaining a high accu­racy and resolution, the Sweep Syn­thesizer output is split into two com­ponents. The lowest 23 bits are used
to produce a 100 to 200

kHz

variable

control frequency proportional to the

mHz

Hz and

frequency setting of the
Generators, while the remaining 8 bits
are used to produce a
69,9

MHz control frequency propor-

kHz

tional to the

setting.

49,9

to

the mixed signal, a 280
filter is employed.

Before application to the outputs of

the Generators the filtered sine-wave

signal is fed to an attenuator and
amplifier for amplitude conditioning.

The output attenuator gives an overall

attenuation of 16 bits enabling the
fraction and exponent of the output
level to be accurately set within 3
digits from 100
the front panel controls and interface
bus of the Generators.

The Output Amplifier provides two
low impedance signal outputs, which
are made available at a BNC socket on
the front and rear panels. These may
be matched with 50

The respective control frequencies
are generated by a digital synthesis
and a divide by “N” phase lock loop.
They are then summed by another

to suit different test system grounding
requirements, may be isolated or con­nected to chassis by means of a slider

switch on the rear panel. See Fig.3.
phase lock loop to produce a 50 to
70 MHz control frequency which after

1O:l

application to a

frequency divider
in the Phase Lock Synthesizer is fed
to the Output Section where the final
stages of frequency conversion take
place. The use of two phase lock loops
for producing 50 to 70 MHz control
frequency, ensures that phase noise is
kept to a minimum.

In the design of the Generators,
particular attention has been paid to
obtaining very low signal distortion
and good amplitude linearity. As indi­cated in Fig. 4 the maximum harmonic
and spurious distortion is guaranteed
better than -96 dB at frequencies be­tween 20 Hz and 20
and third harmonic distortion compo­nents typically

Output Section

From the Phase Lock Synthesizer

the 5 to 7 MHz control frequency is

10:l

applied to a second

frequency
divider which is included at the input
of the mixer stage of the Output Sec­tion. The output is then mixed with

kHz

the 500

output of the Master
Clock to produce a sine-wave signal
whose frequency corresponds directly
to the frequency indicated on the dis­play of the Generators. For removing
unwanted side-band components in

The amplitude linearity of the out­put is better than
quencies between 20 Hz and 20
decreasing to
200

kHz.
plitude falls by 20 dB per decade, but
by utilizing the “Memory Learn” func­tion of the Generators to maintain a
constant output level of 300
less, a flat amplitude characteristic
can be maintained at all frequencies
down to 0,001 Hz.

kHz

low-pass

to 5,00 V RMS via

signal lines and

kHz,

with second

-1l0dB

down at 1

dB

kHz.

at fre-

kHz,

dB at

0,2

Hz and

At lower frequencies the am-

mV

or

output

Fig. 3. BNC Output and Chassis/Floating

switch of the 1049 and 1051

Sweep Synthesizer

The Sweep Synthesizer includes a
ramp register which produces a 31 bit
output representing the frequency set­ting of the Generators. The frequency
may be set by an input either from the
front panel keyboard or via the inter­face bus of the Generators. For a fre­quency sweep, however, an internal
clock signal is used, enabling either
“Linear” or “Logarithmic” frequency
sweeps to be chosen with sweep rates
from 0,001 Hz/s to
0,001

mDecade/s

to 2 Decade/s, re-

999,9 kHz/s

and

spectively.

With linear and logarithmic fre­quency sweeps, six or more complete
frequency decades can be covered in a
single range. The logarithmic sweep
range extends from
200

kHz,

while the linear sweep range

is from 0,001 Hz up to 200

0,2

Hz up to

kHz,

how­ever, either can be independently set
to any lower or upper frequency limit
within these ranges if so desired.

In addition to the above, “Up”,
“Down”, “Up/Down”, “Single”, “Re­petitive” (1 to 99) and “Continuous”
sweeps modes may be chosen. Also
there is a “Pause” function whereby a
preset delay of between 0 and 100 s
may be included between each consec­utive sweep.

Fig. 4. Typical and

frequency range from 2 Hz to 200 kHz

maximum

20k

Frequency Hz

guaranteed distortion levels produced by the 1049 and 1051 Generators (5 V output, no load condition) in the

0.0001

k

3

A convenient feature is that the
Generators automatically compute the
time for a single sweep. The sweep
time is indicated directly on the front
panel display and automatically takes
into account the particular frequency
limits and sweep rate chosen. With
single and repetitive Up/Down sweeps
a minimum sweep time of 8 ms can be
achieved, while with sweeps including
pause or single sweeps in one direc-

tion, sweep times as short as

62,5

are possible.

Because the frequency sweep of the

1049 and 1051 is rate based a higher

sweep accuracy can be maintained.
With generators which are program­med with respect to time the sweep
accuracy is generally lower, partic­ularly with logarithmic sweeps.

Amplitude Memory

Besides a ramp register for frequen­cy synthesis, the Sweep Synthesizer
contains an amplitude register for
controlling the Output Section Atten­uator.

For manual setting of the output
level, the amplitude register accepts a
numeric input from the front panel
keyboard or a digital input applied
over the interface bus of the Genera-

tors. The input may be applied direct-

ly to the amplitude register or, if the
“Memory Learn” function is used, via

the internal memory of the Genera­tors. In the latter case, up to 1024
amplitudes can be stored for success­ive frequencies within any desired fre­quency range of the Generators, and
when recalled enable almost any type
of single or repetitive, amplitude
weighted, frequency sweep to be gen­erated.

The “Memory Learn” function is of
particular benefit for swept frequency
sound and vibration measurements.
When one of the Generators is em­ployed to drive a loudspeaker or vibra­tion exciter, for example, its output
level can be weighted according to the
dynamic response of the loudspeaker
or vibration exciter so that a constant
sound pressure or vibration level out­put is maintained over the entire fre­quency range of interest.

To save entry of each individual
level manually, the “Memory Learn”
function includes automatic ampli-

tude interpolation between consecu-

tive amplitudes input. Alternatively,
amplitudes may be entered as a volt­age signal via the Compressor Input of

the 1049.

Additional Features
Type 1049

Noise Generator

In the Sine/Random Generator
Type 1049 wide band, pseudo random
noise of very even spectral density is
generated by two long shift registers
followed by a low- and high-pass filter.
The noise signal has a symmetrical
gaussian
4,5 with upper frequency limit, line
spacing and sequence length depend­ing on the shift register clock frequen­cy. See “Specifications”.

-0,5 dB lower and upper frequencies
of the filters, nine combinations of
white noise can be obtained, ranging
from 2, 20 or 200 Hz up to 2, 20 or
200
shev types giving less than 0,l
ripple and an 18 dB/octave low- and
high-frequency roll-off. For a pink
noise output over the same frequency
ranges, the white noise signal is fed
through a -3 dB/octave filter before
being applied to the attenuator and
amplifier stages of the Output Sec­tion.

band noise output, the white noise
signal is fed to a balanced modulator
circuit. This produces two DC to
1,25 kHz
phase of 0 and
to two identical low-pass filters. The
filters are
which have a high frequency attenua­tion slope of 18
table cut-off frequency of exactly half
the particular noise bandwidth chosen
on the Generator.

signals are mixed and summed to
produce two complementary signals
which on an amplitude basis represent
each half of the narrow-band noise
characteristic shown in Fig. 5, but with
centre frequency of 500

signals are then combined and fed to
the 500 to 700
Output Section where they are con­verted to a swept-frequency, narrow­band, noise output operating over the
same sweep range as the sine-wave
output of the Generator.

the narrow-band, white and pink noise
generated by the 1049, the noise is
attenuated by 12
respect to the sine output. The

amplitude distribution up to

selecting

B

Y

kHz.

The filters are

the

appropriate

3-pole Chebi-

For a swept-frequency, narrow-

noise signals with relative

which are applied

3-pole

Butterworth type

dB/octave

with selec-

From the low-pass filters the two

kHz.

The two

kHz

mixer stage of the

Because of the high crest factor of

dB

(factor of 4) with

gener-

dB

-10 -6 -6 -4 -2 0
Bandwidths from centre frequency

Fig. 5. Pass band of the 1;

and 316 Hz narrow-band noise
bandwidths of the 1049

ator

automatically accounts for this,

2

3,16;

4 6

10;

31,6;

8 10

100

so that the exact output level in the
noise as well as the sine modes is dis­played.

Compressor

As an alternative means of main­taining a constant output level with a
loudspeaker or vibration exciter, the

1049 includes a Compressor. This en­ables a “live” control signal from an
external preamplifier and measure­ment transducer to be used to auto­matically regulate and weight the out­put level of the Generator according to
the dynamic characteristics of the
loudspeaker or vibration exciter under
actual test conditions.

The Compressor comprises an Input
Attenuator and RMS Detector, fol­lowed by a VCO and Voltage Compar­ator. The VCO is used to produce a
variable-frequency clock signal which
is proportional to the rate of change of
the input signal and is fed to the am­plitude sweep register for automatic
control of the Output Attenuator. The
decision as to whether an increasing or
decreasing amount of compression is
needed to maintain a constant excita­tion level is made by the Comparator,
which actuates the up/down input of
the amplitude register.

The Compressor is equally adept at
regulating the random noise as well as
sine-wave outputs of the 1049 and
gives no regulation error when dwell­ing at a single frequency. In both
modes regulation over a 118 dB range
is achieved, relative to a maximum
output level of 5 V RMS.

4

The amount of compression is ad­justable over a wide range using the
Input Attenuator and either the input
level or the amount of compression
can be monitored directly on the 1049.
For regulating low frequency signals
without distorting the signal wave­form, as well as counteracting excita­tion peaks of loudspeakers and vibra­tion exciters, there is a choice of eight
compressor speeds ranging from
1000 dB/s.

0,3

to

Amplitude Sweep

Also available with the 1049 is a
logarithmic amplitude sweep. This
may be chosen in place of a
sweep and is useful for investigating
the electrical limiting and delimiting
characteristics of audio recording and
reproducing equipment, plus studying
the dynamic behaviour of loudspeak­ers, earphones and telephone hand­sets. For these applications, either the
random noise or sine output may be
employed and the output level swept
up and down with a sweep rate be-

0,Ol

tween

As with the Compressor, the ampli­tude sweep is obtained by utilizing the
amplitude register of the Sweep Syn­thesizer to automatically step the Out­put Section Attenuator of the 1049. In
this case, however, a separate clock
signal is applied whose frequency
determines the particular sweep rate
selected. The amplitude resolution of
the sweep is better than 0,l

and 999 dB/s.

frequency

dB.

Monitoring and
Set-Up Adjustments

Display and Field Entry

For convenient setting-up and mon­itoring of control settings, frequency
sweep and output voltage limits etc.,
the front panel is furnished with a
character vacuum fluorescent line dis­play plus a keyboard for selection of
set-up and operating modes (see
Figs.6 and 7). Depending on the par-

ticular set-up and operating mode
chosen, the display is capable of indi­cating as many as four control settings
simultaneously which also makes it
useful for monitoring control parame­ters during the course of measure­ments.

Just below the display are four Field
Select keys for selecting control set­tings to be changed. These may be
used either to select and set a particu­lar control setting directly, enabling a
linear sweep to be changed to a

40-

loga-

Fig. 6. Vacuum fluorescent line display, plus the field select and speeder controls of the 1049

and 1051

Fig. 7. The Setup Mode, Sweep and

keys of the 1049

rithmic sweep for example, or for in­creasing the number of digits by which
the frequency may be entered using
the numeric

the front panel. Alternatively, the fre-

quency and amplitude limits may be
altered by employing the Speeder
knob which is located beneath the
Field Select keys.

The Speeder emulates the function
of the coarse and fine tuning knobs of
analog types of generator. Turning the
knob a fraction to the left or right
gradually decreases or increases the
displayed value for the function se­lected with the Field Select keys,
while a proportionately larger turn
increases the speed at which the
displayed value is altered.

Operating Set-Ups

When first switched on the Genera-

tors are automatically set to the con­trol settings selected during previous
use. The settings are stored in a con­tinuous memory which is capable of
storing 9 complete sets of front panel
settings or setups so that a number of
exciter control programmes may be
kept on hand for performing frequent-

ly repeated swept frequency tests and

measurements.

pushkeys

on the right of

Signal

The individual setups may be in­stantly recalled whenever desired,
simply by entering their set-up num­ber. Provided that the memory back-

up battery is kept charged by subject-

ing the Generators from between 2 to

4 hours use per week, then the set-ups
may be retained indefinitely. See the
“Specifications” section.

If required an entire setup may be

copied in another setup so that only a
limited number of control settings
changes need be made to obtain a new
setup suited to a specific test or task.
Where more than 9 setups are re­quired, they may be stored externally
using a digital tape or disk station and
input over the digital interface of the
Generators.

Interfacing

Digital Interface

The digital interface of the 1049 and
1051 conforms with the IEEE Std.

488-1978, and is fully compatible with
the IEC 625-l standard. It may be
interconnected with as many as 15
separate instruments at one time, thus
enabling numerous, fully integrated,
ATE (automated test equipment)
systems to be built which may be
operated via a desk-top calculator,
computer or purpose built controller.

The interface has a full Talker (T5)

and Listener (L3) capability, permit­ting remote sensing and selection of
the generator controls, plus printing of
the control status. As with other B
instruments,
easy to interpret acronyms as well as
complete control names for com­mands, thus enabling users to setup
their own fully automatic control
sequences with the minimum of pro­gramming experience.

the interface accepts

& K

5

Recorder Interface

For graphic recording of swept fre­quency tests and measurements ana­log outputs are available for coupling
level or X-Y recorders. These are
shown in Fig.8 and provide the neces­sary control voltages for

synchronous
recording over a maximum of six fre­quency decades with either the B&K
Level Recorder Type 2307 or X-Y
Recorder Type 2308.

With X-Y Recorders, recordings can
be made on linearly or logarithmically
graduated paper, irrespective of which
type of frequency sweep is chosen on
the Generators. Also plotting of for­ward and reverse frequency sweeps is
possible and for tape recorder and
acoustic investigations the X-Y syn­chronization can be delayed between 0
and 1 s in 10 ms steps to coincide with
the arrival of the measured signal. For
continuous monitoring of measure­ments the wide choice of sweep rates
of the Generators enable the X-Y out­put to be used to control an oscillo­scope.

Auxilliary Outputs

Supplementing the sine-wave and
noise outputs of the Generators is a
square wave output. This provides a

1

mHz

to 200

kHz

TTL signal corre­sponding with the frequency setting of
the Generators which will be found

ideal for pulse testing of electronic
measuring, recording and reproducing
equipment.

Also available with the Generators

are a fixed frequency (5 MHz) and a

Fig. 8. The Recorder and Digital Interface

connectors of the 1049 and 1051

variable frequency (5 - 7

MHz/50 ­70 MHz user selected) output which
may be used as clock references for
external equipment.

Synchronization Input

For locking the internal clock of the
Generators with an external source, a
Synchronisation

Input is provided
which accepts a 10 MHz signal or an
appropriate

sub-harmonic.

See

“Specifications”.

Examples of Use

Because of their high performance
capability and extreme operating flex­ibility, the Sine/Noise Generator Type
1049 and Sine Generator Type 1051
can be used for a very wide range of
applications.

Fig. 9. The Fixed and Variable Freq. Out-

puts, plus the External Synchroni-

zation Znput of the 1049 and 1051

Their wide frequency and dynamic
ranges, high accuracy, resolution and
stability, plus extensive remote con­trol possibilities via a standard
IEEE/IEC digital interface, make
them an ideal ATE signal source for
electronic design and development
work, quality control, production test
and service of a wide variety of electri­cal products. In addition, the noise
output and compressor facilities of the

1049 will find extensive applications
in electro-acoustic and building acous­tic investigations, as well as in vibra­tion testing of mechanical components
and structures.

For use of the 1049 and 1051 as part

of a larger measurement system

& Kjær

markets a range of analogue

Brüel

and digital equipment. These include
the Digital Voltmeter Type 2432, Dig-

IEEE/lEC

Interface

Sine Generator

1049/1051

,

Electronic

Device under

Test

Fig.

10. Automatic test arrangement for frequency response measurements (amplitude and phase) on electronic equipment. Using their inter­nal memory for preconditioning, the 1049 and 1051 Generators can simulate a record pick-up, tape head, preamplifier equalization
network output etc.

Computer

Cable

Graphics Plotter

2319

ital

Phase Meter Type 2977, High
Resolution Signal Analyzer Type 2033
and Dual Channel Signal Analyzers
Type 2032 and 2034 - all of which are
especially designed for a wide variety
of response measurements and fre-

quency analyses. For storage and
documentation of results the Digital

Cassette Recorder Type 7400, plus
Graphics Recorder and Plotter Type
2313 and 2319 are available. Some
typical examples of the use of these
instruments with the Generators are
shown in Figs.10 to 12.

As with the Generators, all the
digital equipment mentioned can be
controlled via a computer or purpose
built system controller which features
an IEEE/IEC interface. This makes
them ideal for use in laboratory, pro­duction and environmental testing
where very many performance tests
and calibration checks have to be
carried out which are of a repetitive
nature. Here it is useful that tests are
carried out on an automatic basis us­ing a computer or system controller to
control the entire test setup. Also, a
computer can be used for reformatting
measured data to produce a hardcopy
readout of frequency, phase and am­plitude responses etc., with a graphics
recorder or plotter. In more advanced
systems a computer may be used to
decide on whether test results are
within acceptable limits as well as to

diagnose faults.

For further details on the B&K

equipment mentioned, please consult

the B&K Short-Form or Master

Cata-

logues.

IEEE/IEC

Interface Cable

Electronic

Device under

Test

1

High-Resolution
Signal

Analyzer

Graphics Recorder

2313 + Application

Package

BZ

7002

Fig. 11. Harmonic distortion measurements using the 1049 or 1051 Generator with the 2033

High-Resolution Signal Analyzer

IEEE/IEC

Interface Cable

Dual Channel

Sine Noise Generator

1049

Fig. 12. Automatic test arrangement using the 1049 Sine/Noise

Signal Analyzer

2032/2034

Graphics

2319

Generator

Plotter

with the 2032 or
2034 Dual Channel Signal Analyzer for transfer function and distortion measure­ments on electronic equipment. Using the amplitude sweep function of the 1049 the
attach and release time of compressor/expander circuits

and

other non

linear

equip-

ment may be measured

SINE GENERATOR:
Frequency Range:
generator can be used at frequencies down
to 0,001 Hz. See “Amplitude Linearity”
Frequency Resolution: 1 mHz
Frequency Stability:
40°C with <5 ppm aging per year
Harmonic and Spurious Distortion:

(-96 dB

within 20 Hz to 20

<-85 dB

within

<-75 dB
Phase and A.M. Noise:
over 200
rejection band centered on output frequency
Amplitude Linearity:

GENERATOR OUTPUTS:
Via BNC sockets on front and rear panel
Output Voltage: 100
table to 3-digits with

within 100

kHz

dB

from 20 Hz to 20

dB from

-3 dB

limit

attenuation slope down to 0,001 Hz

0,2

Hz to

2OOkHz.

The

Spec.

<25

ppm from 10 to

kHz

to 200

<-85 dB

to 5 V RMS

kHz

kHz

kHz

measured

kHz

kHz

relative atten-

0,2

Hz to 100

range with 5 V output and 1 Hz

0,2

Hz to 200

Hz with 20 dB/decade

Specifications

uator accuracy. Output readout based on
load condition

Output Impedance: 50

Grounding: Chassis/Floating (0,1 V max.)

OUTPUT On/Oft

<O,1

Fast:

Slow:
output signal 60

AMPLITUDE MEMORY:
1024 amplitudes can be memorized within
any given frequency range and later recalled
for successive single or repetitive amplitude
weighted frequency sweeps. Amplitudes may
be input numerically via the front panel

keys, digitally via the IEEE/lEC interface or

as a voltaae input to the 1049 compressor.

Includes automatic amplitude interpolation

between consecutive amplitudes input
FREOUENCY SWEEP:

Linear/Logarithmic with or without amplitude

weighting from amplitude memory

ms rise and decay time

-30 ms for raising and suppressing

1049/1

dB

051

no-

push-

Sweep Limits: from

table to 4 digits. In extended range 0,001 Hz

kHz

to 200

reached within the resolution of the program­med stop frequency

Sweep Rate:

Sweep Resolution:

Sweep Modes: Up, Down, Up and Down,
gle, Repetitive 1 - 99 times and Continuous
are selectable
Amplitude Weighting: 1024 amplitude levels
can be played back during the frequency
sweep. See “AMPLITUDE MEMORY”

linear sweep. The limits will be

Linear: 0,001 Hz/s to
table to 4 digits with
Logarithmic: 0,001 mDec/s to 2,000 Dec/s
selectable to 4 digits with
per Dec/s accuracy

Linear:

<0,244

Hz at rate

Logarithmic:

Dec/s

or frequencies <1

outside the above limits

<1 mHz

0,2

Hz to 200

at rate

>4,788

<1 mHz

Hz

999,9

accuracy

<4,768

kHz/s

at rate

kHz.

kHz,

selec-

kHz/s selec-

kHz/s or

<8,089m-

0,244 Hz

Sin-

Spec.

7

Sweep Pause:
repetitive sweeps, selectable with 10 or
100 ms resolution and 1 ms accuracy
Pause Output: Output may be set “On” or
“Off” between repetitive sweeps
Control Limits: Sweep on may be individually
preset to reference or any preset lower and
upper frequency or amplitude limit dependent
on sweep type
Sweep lime: Computes and displays time
for single sweep between particular lower
and upper limit and sweep rate selected.
Minimum single sweep time is 8 ms for repet­itive Up/Down sweeps and
including pause or single sweeps in one
rection

LINE DISPLAY:
40-character, vacuum fluorescent, line
play with 4 display fields for entry and
age of generator control settings, as well as
simultaneous monitoring of generator output
frequency, output voltage, compressor
age, etc.

TEST PROGRAMMES:
Non volatile memory for storage of front pan­el control settings. Enables 9 user-defined
control sequences to be stored and instantly
recalled for electronic, electro-acoustic and
vibration test work. For continuous storage of
control settings the Generators must be

0,00

to

100,0

s pause between

dis-

stor-

volt-

sub-

di-

jected to 2 to 4 hours use per week.

AUXILIARY INPUTS/OUTPUTS:
Via separate BNC sockets on rear panel

Square Output: TTL square wave output of

generator frequency from 1
Ext. Sync. In: For phase locking internal
clock with external signal source

Input Freq: 10 MHz down to tenth sub-har

-monic
Input Voltage:
Tuning Range:
Ground: Chassis/Floating (0,1 V max)

Fix. Freq. Out: 5 MHz square-wave output
reference frequency

Output Voltage:
Output Impedance: 200

Var. Freq. Out: User selected 5 to 7 MHz or
50 to 70 MHz output depending on generator

0,6

100 ppm

0,6

mHz

to 200

to 30 V Peak-to-Peak

V Peak-to-Peak

kHz

frequency

Output Voltage:

Output Impedance: 25
Sweep Start: TTL output for trigger
ing

0,6

V Peak-to-Peak

record-

RECORDER INTERFACE:
Level Recorder: 7-pin DIN socket providing
remote control of start, stop, automatic stop
and pen lift

8-pin

DIN

socket

X-Y Recorder:
mote control of pen lift and X-deflection
Voltage Ramp: 0 to 10 V for X-deflection 12
bit D/A Converter. Linearity 10 bit. 200 Hz
sample frequency
Ramp Voltage Limits:
Lin. or Log. voltage ramp selectable for either
Lin. or Log. frequency sweep

Lin. Ramp: 0 to 10 V for any lower or upper

frequency limit from 0 Hz to 200

fixed limits of 0 Hz to 200 Hz, 0 Hz to 2 kHz.

0 Hz to 20

Log. Ramp: 0 to 10 V ramp for any lower or

upper frequency limit from

200

2 Hz to 2

to 200

Amp. Ramp (1049 only): 0 V to 10 V for
any lower or upper amplitude limit from

40 to

kHz

and 0 Hz to 200

kHz

or fixed limits of

kHz,

20 Hz to 20

kHz

140 dBpV

Ramp Delay:

resolution down to

IEEE/IEC
Conforms to IEEE 488 and IEC 625-l
dards. Connection into an IEC interface
tern is made using cable A0 0264 or cable
A0

0194 and Adaptor A0 0195. Connection

into an IEEE interface system is made using
cable
Functions Implemented: Source Handshake

1).

(SH
(T 5).

Listener (L 3). Service Request (SR
Remote Local (RL
vice Clear (DC
troller (C 0)

Data Ouput: Generator frequency, output

el etc., plus all front panel control settings

0,00

to 1

0,O1 s

DIGITAL INTERFACE:

A0

0265.

Acceptor Handshake (AH

1),

Parallel Poll (PP 0),

1).

Device Trigger (DT I), Con-

providing

0,2

Hz to 200

kHz

and 80 to

,OO s

selectable with

and 200 Hz

kHz

0,2

l),

kHz

Hz to

kHz,

stan-

sys-

Talker

lev-

re-

or

De-

Remote Control: All functions and instrument

front panel settings can be remotely
trolled via the digital interface.
/frequency can be set with full resolution in
less than 20 ms Binary (30 ms ASCII) format

IS0

Code:

7 bit code

con-

Amplitude-

GENERAL
Warm-Up lime: -20 minutes
Temperature Range:

Operation: 10 to 40°C (50 to 104°F)
Max. Humidity: 90% RH (non condensing) at
30°C
Electromagnetic Compatibility: Complies
with Class B Device of the American FCC
Rules
Power Requirements: Complies with IEC 348
Safety Class II

Supply Voltage: 100; 115; 127; 200: 220;
240 V AC (50 to 60 Hz)
Consumption: 50 VA

Cabinet: Supplied as Model A (light-weight
metal cabinet) or Model C (as A but with
flanges for standard 19 in rack)
Dimensions: Metal cabinet, excluding knobs
and feet

Height: 133 mm
Width: 430 mm

Depth: 320 mm

Weight:

Type 1049:
Type 1051:

ACCESSORIES INCLUDED:

1 xMains
1
1

2
2x500 mAA
Instruction Manual

ACCESSORIES AVAILABLE:
Service Manual
Interface Cable (2 m), IEC 625-l

(25-way)

Interface Cable (2 m), IEEE-488 A0

X-Y Recorder

ControlCable
Level Recorder

Plug

xBNC

x IEEE Std. 488

Connector

Bus

x250 mAA

to

ControlCable
RackMounting

(5,2

in)

(16,9

in)

(12,6

in)

11,6

kg

(25,5

11,1 kg

Cable

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . JP

Fuse

Fuse . . . . . . . . . . . .

IEEE

488 . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(1

,55

(1,5

Flanges . . . . . . . . . . . . . . . . . . . . . . . .

lb)

(24,5

lb)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AN

Kit . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VF

UA

VF

AO0

m) . . . . . . . . .

m)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . AQ

AQ 0034

KS

0020
0035

0814
0031
0023

0264

0265

0035
0023

Additional Specifications 1049

NOISE GENERATOR:
Generator Type: Pseudo Random
Distribution: Symmetrical Gaussian
tude distribution up to

Line Spacing and Sequence Length:

Spurious Distortion: As for Sine Generator

dB

+12
Spectral Flatness: kO.5 dB within freq. range

Output Voltage: As for Sine Generator -12

Narrow-Band Random Mode:

Centre Frequency: As for Sine Generator

WORLD HEADQUARTERS: DK 28.50

450 2066

(1) 645720 10 Federal

Japan 03

(08) 71 12730

Republic of Korea

4,5

of Germany (04106) 4055 Great

554 0605 Norway 02-787096 Portugal (1) 6592561659280

65

ampli-

61

Noise Bandwidth:
316 Hz. Actual -3dB bandwidth
rower than noise bandwidth

1: 3,16;

Filter Types: 3-pole Butterworth

4,6%

Filter Type and Ripple: d-pole Chebishev

<0.1 dB

Pink Noise Mode: As for White Noise Mode,

dB

but with -10 dB/decade attenuation above 2;
20 and 200 Hz lower limits

less

ripple

Denmark Telephone

9745

7139303 USA

(011) 246

(01) 954

481 7000 Local

10;

31,6;

100 and

4,7% nar-

AMPLITUDE SWEEP:

Rate:

0,O1

to 0,1 dB and

Switching: Amplitude sweep and compress­or regulation
range switching at the following levels:

Speed:
1000 dB/s
Input Attenuator: 0,10 to
1%. 3 digit,
Input Detector: RMS

to 999 dB/s with resolution down

to

causes small

0,3; 1;

3; 10; 30; 100; 300; and

0,O1

V resolution

Freq. Response: 2 Hz to 200

Telex 37316 bruka dk Fax

Canada (514)

Holland 03402 39994 Hong Kong 5 487486 Italy [phone]

and service

Finland (90) 80 17044

2258533 Span (91)

accuracy

transients due to

2,50

1405

1000

V accuracy

kHz

0,2

dB