Film-Tech

Film-Tech
The information contained in this Adobe Acrobat pdf
file is provided at your own risk and good judgment.
These manuals are designed to facilitate the
exchange of information related to cinema
projection and film handling, with no warranties nor
obligations from the authors, for qualified field
service engineers.
If you are not a qualified technician, please make no
adjustments to anything you may read about in these
Adobe manual downloads.
www.film-tech.com
TTT=ilEil
lbL=+J=#il=
Inffitffi#*#ilI
ilffiffiffiffiffiffiffimI
ffiffiffi=r
Imffi@ww
===ilI
tffiffiffiffiffiffiffi
THryruHruru
ilIUTruII,[II
TEI]:ililruNLT
ruIIIIHII
AFITAEOO DataSummry
or largescreendisplay
The ARTA600 may be usedwith any D.C.coupledoscilloscope
mode
operation.
of
X/Y
capable
Frequency Range Audio Band,25Hzto 20kHz
third-octave
Filters 30'single-pole-pair'
filterson ISOcentresfrom
25Hzto 20kHz.(25H2,31.5H2,
40H2,50H2,63H2,80H2,
100H2,125H2,160H2,2NHz,2 Hz,315H2,4NHz,500H2,
630H2,800H2,lkHz, 1.25kH2,
1.6kHz,2kHz,2.5kHz,
4kHz,5kHz,
3.15kH2,
6.3kHz,8kHz,10kHz,12.5kH2,
16kHz,
20kHzl
Measurement Range -60dBm to+20dBmin fiveswitchedranges
Display Range 20dB
Detector Ballistics Fastor slowto suit programme
or noiseanalysis
Inputs Mike
Line
Pink Noise Output
inputon XLR-3-31
Onebalanced
connectorwith
+ 12volt phantompowering
Two unbalanced
inputs,X and Y, on 4mm
terminals.
)10kohmsinputimpedance
flat, unbalanced
outputon 4mm terminals.
Spectrally
700mvoltsmaximumlevel.
Outputs to Display Calibration
controlsset polarityand magnitude
of output
of displayinputs.Up to 5 volts,
signalsto suitsensitivity
+ or -, available
on 4mmterminals.
mode - 1OdB,0dB,and + 10dBgraticulelines
Graticule In analyser
may be generated.
Oscilloscope
shiftand analyser
calibration
controlsallowtheselinesto be set behindexisting
graticu
oscilloscope
le.
Display Mode
Analyser
SelectedinputchannelX,Y or Mikeis analysed
and the energylevelin the 30 ISOcentered
third-octavebandsis displayedas an easyto
readhistogram.Wide bandenergyfor total
signallevelis alsodisplayed.
XY
LinesignalsX and Y aredisplayed
in X/Y mode
phase
for
comparisons
Both
modeand
Selectedinputchannelin analyser
Lineinputsin X/Y modedisplayed
simultaneously
Bypass Allowsuseof oscilloscope
without repluggingleads
Power Requirements Internally
wired 115or 230voltsA.C. 50/60H2
1OVAnominal
Mechanical
Dimensions432x 89x 263millimetres,
optionalbrack-ets
rack
mounting
allow
Weight
3.5 Kg
ABACUS
ELECTtrICS
Abacus
Electilcs
10BarleyMowPassage
Chiswick
W44PHEngland
(01)9946477Telex8811418
Telephone:
London
Gables:
Workspace
London
TABLE OF CONTENTS
UNPACKINGAND INSTALLATION
A - 1
Choice of oscilloscope Display
Connection/Calibration
l,ine/t'tike
Input
of Oscilloscope
Connections
A - 2
Display
A -
L
A - 6
INTRODUCTION
B - 1
APPLICATIONNOTES
c -
t
Ceneral_
C -
t
Audio Signal Analysis
c -
1
Acoustic Measurements
C -
2
Tape Machine Alignment
c -
TECHNICALDESCRIPTIONAND SERVICING
D -
Unit Disassembly
User Adjustable
pre-set
I
I
I
D - 1
Controls
D - 1
ARTA 600 Block Diagram
D - 2
Circuit
D -
Descripti.on
.|
Service Hints
D -
Circuit
D -
B
D -
12
Diagrams
Component placement Diasraln
I
A - 1
A
UIIPACKINCAND INSTALLATION
CiTSCKST]PPLYVOLTACEBEFOREAPPLYINGPOWER
A rear panel labe1 indicates
1'll volt
wiring
or 2J0 vort
operation.
rf
then the bottom cover plate
section
it
has been wired for
is necessary to change the
should be removed (see servicing
of haudbook) and the mains transformer
the information
The unit
unit
whether the unit
will
brackets,
rewired according to
printecl on it.
may be used stantling on a bench or laboratory
also mount into
trolley.
The
a standard 1! inch rack using the optional
type 501.
The analyser is
suppliecl with a l-wire
socket. I'lhen connected to a suitable
power cabr.e with mourd.edr.E.c.
receptacle
the instrument
cabinet
and panel will
be grounded.. Signal ground ie connecterl to chaeej.s via
10 ohms in paralleL with 4?nFr in order to avoid earth roops.
The following
wiring
convention should be observed when using the
polrer cable supplied with the unit.
(Continental
Style )
t,irr"
Neutral
Earth
Brown
Blue
Creen/Ye1).ow
A - 2
Choice of Oecilloscope Display
Many ueers will
arread.y have an oscil.loscope with which they intend
to the use the ARTA600 analyeer ad.aptor. Eesential requiremente for
the itisplay
ares-
1) Must be capable of xfr mode operation.
vertical
ileflection
2) x (horizontal)
3) nertection
{)
and.
both avai).abIe)
and y (vertical)
to be rinear
inputs to be D.c. coupred.
(worst case linearity
! vorts peak or less must be sufficient
full
(rnpute for horizontal
of 5dltorerable)
to deftect
the spot the
width or height of the ri.isplay.
5) For analyser mode display
a minimum banctwidth of lkHz for the
horizontal ileflection antl lOkHz for the vertical
deflection ie
required.. For X/Y and rBothr morle of operation bandwiclthe of
20kEz horizontally
ancl verticalry
are required, with low relative
phase shift.
Large Screen Display
Large screen (9" to 12") monitors may be used for studio, laboratory
and, educational purposes where viewing at a dietance is required.
These clisplays,
horizontal
usuolly
baeed on T.v.
banclwidth. This ie a4squste for
histogram
waveform but ie insuffici.ent
(relative
ohase) d.isplays.
ft
technologyr
ehoulal be noted that
for
often have onry .tkHz
displaying
the analyeer
showing useabre X/y
a video monitor is not suitabte
does not prod.uce a vid.eo sigaal
suitabre
as the ARTA600
output.
large screen x/y monitors includ.e wavetek models 1901c, 19oj
a n d 1 ! l 1 r T e l o n i c m o d e l 1 2 1 , I { a r c o n i f n s t r u r n e n t e m o d e l T F 2 2 1 2 Aa n d .
certain
mod.els by Kikusui.
r { - J
Service/Laboratory
Oscilloscope Display
l l o s t r n o d e r no s c i l l o s c o p e s a r e e n t r r e l y
t h e A R T ' A6 0 0 . s o m e o s c i l l o s c o p e s
a single push brrtton and this
external
X) position
satrsfactor.y r.or use wii|.
s e l e c t X , / y r n o , i eo t - o p e r a t i o p w r t t r
i s i r l e a r . , o t h e r s L r a v ea n x , / y ( n "
o r r t h e t i r n e b a s e s p e e d s w i t c ; r r . i 4 a n . y , 1 u a lc h a n n e r
oscilroscopes use the two input arnplifiers
for x arrrly def).ectronl
single channel and somed.ua] channel oscilloscopes have an rlixternal
XI input for use whenthe timebase is switche,i oI.I.. All
of these
variations are satisfactory.
square (rectangular) oscilloscope screens are to be prefercl
to rounl
o n e s . ' ' d i t h r o u n d s c r e e n s a c h o i , c e m u s t b e m a c r eb e t w e e n
havin5, a
smaller trace or occasionally
losing part :.f the.lrsplay
in the corners.
some portable
o s c i l l o s c o p e s h a v e v e r y s m a l - Ls c r e e n s a n c t h o u g h u s e a b l e
makean analyser trace difficult
to resolve. Three or five:"nch
(8 x lOcm) screens are to be prefererl..
Connection/Catibration of 0scilloscope Drsplay
t ) Switcn on oscilloscope
a n d A I i T A6 0 0
e ) s w i t c t r o s c i l r o s c o p e t o x / y r n o d eo f o p e r a t i o n a n , l
inputs to D.c.
c o u p l i n g . A s i n g l e s p o t s h o u rd b e v i s i . b l e o n t l r e
scr.een. Tf'
variable sensi-tivity co'trors are proviileil t'ese
shoul,r be put
i n t o t h e r c a l r p o s i - t i o n . r f p o s s i b r e X a n c ty s e n s i . t r v i t r e s
shouri
be set to about 1 or 2 volts full scale deflectron.
l ) c o n n e c t o u t p u t s f r o m A R T A6 0 0 t o v e r t i . c a l a n d h o r i z o n t a i
inputs
of oscilloscope using 1ow capaci-ty screened cables, pref'erabry
of'
identical
length.
4 ) s e t A R I ' A6 0 0 i n p u t s e r e c t o r s w i t c h t o a n y u n u s e . i r n p u t a n d r i i . s p r a . y
mode switch to analyser moce. A horizontar. rine shourrl
now be
observed.. (A verticar line may incricate that horizontal
anl
vertical
signals have been .eversed). This line
d i .s p l a y 1 i n e .
i s t h e r . o w e r i - 1 , 1 : i B)
N.B. Bypass button should noL be depressed.
) ) Lrnk Pink iJoise output socket to X l,ine r'put anri sel ect x. rnput
.
Turn Pink lloise output level to maximurnanr Tnput Sensi.
t,ivrty
controls to OdB,
A pink
noise
easily
histograrn
observed if
scope horizontal
reading
cisplay.
control
the
rf
shift
high
the
it
division.
is
alig'n
off
reading
convenient
central
Press and hord in
Two linesr
original
right
to
to
above.
rf
the
-1ocB 1ine.
teft
T'he
si,rle of
the
with
tlre
calibration
thj,rd-octave
1rllz,
considerei
with.lry
(c;nar.)
anC
lo divisions
each g.raticrrle
channel-s
division
are
2 K H z , Q t < I t z ,6 k i l z ,
The widebanil channel
be visible.
OdB and +10d8, should
oscillo-
should reduce irr size
rj.ght.
graticule
lhe
sul.tably.
hanl
on the
1 2 J H z , 2 J O I i z , l O O I l z,
from Left
trace
to have three
scope acreen could" be labelled
6)
the
The trace
screen but m'ry stil-l
set up as detailec
the
For oscilloscopes
The banls
J1 .5H2, 6JtIz,
a n d 16 k t l z ,
just
control
should be rotated.
horizontally
then
on the ARTA600 anl
wideband channer is
direction.
L s c l e p r e s s e : l. t J s r n 5 . t h e
controL
shourc be at
then reverse
per
should now be seen. T'his may be more
tspeed I button
rcal,ibrater
horizontal
channel
trace
rs
I,'ig. 1 shows a trace
11
esirable
the
o s c i . l .l o -
rub-.lown letterirrg.
button
now be seen in
using the oscilLoscope
on the analyser.
ad,iition
verti.cal
to
the
shii't
TEIEC]TJPMENT
LIT
TArC
5\
Fig.1.
Pink noise -
analyser
per graticule
division
mode. liote three
thrrd-octave
and widebarid channel to
right
bands
of display.
A - i
rcalibraler
contror anc the AnrA 600 vertica]
controL these
lines shoulri be set behind the existing oscill-oscope irraticu).e.
Fig.2 and Fig.3 shol two possibilities;
range (Z.5an/division)
and f ig.3
Fie'.2 with 2odB displaye:l
wj.th 16,ili ,iisplayel
range
(zan/aivision).
N O T B .r f t h e o s c i l l o s c o D e v e r t i c a l
sensitivity
a n d t h e A R T A6 0 0 h a s b e e n a l i s . r r e , . jf.o r 2 l / 1 i v .
is set to o.2vil,fiv.
then switcliing the
oscilroscope to o.1r//cliv. vnIl give 14I /div. for the :rnal.vser
di spla.y.
Oscilloscope
calibration
is
now cornDl-ete
OETAY
+ 10,18
tlst
XULI
T 8 l
TRIG
LEV€L
-./\v
0atB
i-
^'toroaoo,r,
rI='
-10d8
*"-rl$dK
Fl.g.2.
Pink norse plus
graticule
-
ril,
20dB displa.yed ran€-e
Brnrc
LEVCI
C
P O IA s I T Y
rI=
-10d8
F|r€ POS|I|ON
*,l!ii%,
Fig. J.
Pink noise
plus
graticule
-
rff'
16CB lispla:.,ed range
a,-6
l,inefttike
Input
connections
Line Inputs
The Line
rnputs
x ancl Y are unbalanced. anil have over lokohms input
impedance. 4rnmbanana eockets are used on stand.ard. spacing.
connections shourd. be made ueing low capacity
screened. cab1e, the
screen going to the earthy side of the input (tlact terminar).
Test leade used. for x and y inputs should preferably be identical
in tyoe a^nctlength ae in certain circumstanceg relative phase shift
at high frequeacies
may be discernible
when the clieplay is
in x/y
mod.€o
Mike Input
The Mike input
is balanced. via a transformer
500 ohms input
imped.ance. 12 volt
(t2 volts
certain
phantom powering is provided
via 470 ohms to transformer
microphonee will
and has nominarry
primary centre tap)
connect directry.
and
The AKG c4518 with cK2
capsule is recommended..
A cannon xLR-3-31 connector is used., pins3and 2 are signal input,
pin 1 is earth. Extension cableg should be twin-ecreened. microphone
cables of high quality,
pins 3 and 2 carried
through by the twin
coresr pin 1 by the shield.
earth
Pins 3 and 2 should NO'r be connected. to
(pin 1) as D.c. current wilr pase through the input transformer.
rf a dynarnic microphone is to be used it
J and.2, pin
supply will
1 should not be uged. rn this
should be connected to pins
way the 12 vort
not darnage the dynarnic microphone.
phantom
B - 1
B
INTRODUCTION
The ABACUSELEcrRrcs ARTA 600 analyser
ingtrument that
intensity
enables an oscilloscope
and spectral
Electrical
signals,
dietribution
of sounds.
directly
tape-record.er,
mixing console, etc.
high sensitivity
microphone input
x and Y, alloring
+ 2 0 d B m( 7 . 7 5 v o t t g )
The selected
a parallel
input
anay
to rlisplay the real-time
comesponding to the pressure of sound.sr maJ
be fed to the analyser either
inputsr
adaptor is a compact
from a microphone or from a
Three inputs are prorrid.ed., one
and two id.entical
line
revel
between -.60aBm(??5 pvorts)
signals
and
to Ue observed.
channer, after
of active
the audio spectrum into
suitable
revel adjustment,
band.-paes firters.
30 contiguous
These firtere
channels centred
feede
divide
at one-third
octave intervars
fron ZJHz to 2okHz. Each filter
feeds a d.etector
rtime-constants
I of the ]atter d.etermining
and integrator the
the
d.ispray balristics.
Large time-constante give longer integration
times and hence slower ballistics
which are more suited to the
measurements of continuous noise epectra.
suited
to the examination
the spectral
are
of music and other progralnme material
where
content changes more rapidly.
An additional
total
Faster ballistice,
detector/integrator
monitors
the wideband. signal
for
signal
energy. This wideband channel appears to the ri.ght hancl
sid.e of the frequency spectrum display and is attenuateit by loctB
relatively;
see Fig.{.
(see service
generally
rf requiretl
information),
be over full
amprifier,
may be given the same gain
however on full
spectrurn signals
it
will
scale.
The D.C. output voltages
and the resulting
it
of the 31 integrators
voltage,
after
forms the vertical
histogram analyser trace.
passing through a logarithmic
deflection
waveform of the
The logarithmic
an egual-clecibel-per-division
are sarnpled in eeguence
verticat
arnplifier
rstepped.l
is ueed to produce
scare with a 2oaB (+1odB to
-10d8) window.
The horizontar
deflection
waveform so that
freguency.
signal
the display
is
is a synchronieed. repeating
shown in terms of level
ramp
against
i J - z
The anal.;'ser histogram
switches
and then on to
and calibration
ln
y./Y mode of
pre-amplifier
in
and ramp waveforms pass through
tbothf
output
s o c k e t s v j , a b u f f e r a m p l .r t ' i e r s
controls.
operati.on the
output
moce the
ima6;e is
the
electronic
signals
switches
pass the
electronic
switciies
instea.j. of
the analyser
rapirl]-y alternate
so that
X an.i y
waveformsl
a combi.nel
observed.
T h e A R T A6 0 0 a n a y s e r c o n t a i n s a p i n k n o i s e g e n e r a t o r w i t h v a r i . a b l e
output leveL that may be used as a signal source for
s . y s t e r n su n d e r
test.
Pi.nk noise contains energy at all. frequencies with equal
e n e r g - yp e r - o c t a v e b a n d w i c t h , w h e n c i s p l a . y e d i t g i v e s a f l , a t v o l t a g e
response. The frequency response of a system may be Cisplayerl
b y u s i n g p i n k n o i s e a s a n i n p u t s i g n a l a n d e x a . . n i n i n gt h e
directly
spectrum of the system output.
For a stereo source left
and rig,ht channels may be fec to x. ani y
line inputs and by depressing both X and y input selector burtons
t h e s u m o f l e f t a n d r i g h t s i g n a l s ( r n o n o )w i l l b e d r s p l a y e l .
rn
xfY and tboth t mode only the switched input sensrtrvity
varies the magniturle of the XfY display,
inoperative.
An overloa'i clipping
anrl in high level
lower left
this
circuit
the variable
control
control
:.s
y
,
/
y
operates on the
display
signal conCj.tions somewaveform dlstortion
in the
hand corner of the display may be observec; in practice
is of no sip,nificance.
+1JCB
-10d8
Fj-g.4.
l k H z t o n e - a n a l y s e r m o i e . N o t e l O d . t sr e l a t i v e
attenuation
o f r v r d e b a n Cc h a n n e l .
R -
i
TELEoUIPMEI\IT.
^"oro,
or,t,
il','
SOIJRC€
Fig.l.
X/Y mode- coherent pink noise fed to X an,t Y ]rne i.nputs
-
RCP
I
E
BD€
at ,
'IM€
TULT
sEt I lrur to €tt
Brnrc
LEVTL
Fig.6.
rBoth I mode -
X or Y }ine input selected, coherent pink
noise fed to X
q n {
orr I
Yr
l ai rnl so
a
^
ri rhl np Lr ., Lt D
c - 1
APPLICATION NOTES
General
range antt ballistics
The display
of the ARTA600 analyser adaptor
may be switched to optimise the instrwnentrs characteristice for
various applications.
The instrurent fs large firnanric range al1owe
measurements on systeme of widely varying
output capability.
When
using the internaL
pink noise generator as a source to excite
eystem under test
ensure the system is not being overloaded as
inaccurate
input
read.ings and/or d.amageto the system may result.
sensitivity
of the system is unlorown always start
pink noiee output level
control
a
If
the
with the
turned down and gradually
increaee
d.rive to the system.
Audio Signal Analysie
The spectral
of energy in audio signals
distribution
by feeding the prograrnmematerial
audio line.
to the analyser from mi.crophone or
Where the spectrum of the signal
speech or musj.c fast ballistics
may be observeC
varies
are suitable.
If
rapidly
as with
the residual
noise of
a system is being examined (to measure the hum content say) slower
ballistics
may be more appropriate.
The lower level
cornponents of the signal may be observed in the
presence of high leveI
the analyser.
the display
will
indicate
It
fulI
components by increasing
is quite
satisfactory
when the analyser input
and wilI
to exceed
stage is overloaCed.. As the
from overload occa sional
not affect
instrument,
time constant is approximately
short d.uration transients
und.er reading will
that
filters
when high resolution
reading of transients
overload is
the accuracy of read.ings significantly.
The ARTA 600 is not a peak indicating
mod.ethe attack
for the signals
is inevitable
even in its
at a freguency half
by 3al in each adjacent
band.
fast
2Omsecand so on fast,
occur.
ft
shoulct be noted.
are used. in an analyser
due to the rise-tim.e
eome rrnderof the filters
themselvesr Dn€ to the nature of multi-band. analysers a signal
occuring
of
scale d.eplection (+1Offi); the overload inclicator
analyser recovera instantly
permiseible
the sensitivity
peak
way between band centreg wi.1l under-read.
Acoustic Measurements
Real time measurement of the frequency response of acoustic
may be camied. out using the ARTA 600 analyser
quality
adaptor and a high
microphone. The loudspeaker system is excited with pink noise
and the noise received in the listening
for
systems
spectral
area is fed to the analyser
exarnination.
when injecting
pink noise into
d.ownto avoid. inad.vertently
a system start
overloading
with the level
and possibly
turned
damaging the
speaker system. In a cinema where the analyser may not be in the
auditorium
level
check (by ear) tire actual
is being produceC without
sound. level
to ensure a realistic
causing system overload.
Most large aud.itoria have a resid.uar background noise,
frequencyr that
wirl
due to traffics
wrderground. trains,
be visible
usually
on the anaryser display.
ventilation
of low
This may be
systems etc and when
checking the response the 1eve1 of the pink noiee shoul,d be at reaet
10dB over the lever of the rumble so that misleacing
read.ings do not
OCCTLPe
It
is important
to move the microphone around to see an overall
pictu.re as highly
points
different
l'lhen adjusting
wj.Il give quite
electro-acoustic
or parametric
can often give considerable
due to structural
position
electrical
equalisation
improvement in sound quality,
and loud.speaker dispersion
by equalisation
anrl in certain
constraints
or direction)
UsualIy such pbysical
rritt
changes will
affect
will
all- be
cases only physical
(shape or surface materials)
to the auditorium
fitting
equari.sers there are a number of
defects cannot be overcome. Reverberati.on times,
standing wave patterns
(typ",
responses by the use of tone controls,
to be consid.ered. Although careful
unaffected
response curves at
different
in a room.
octaver third-octave
factors
Ioudspeakers, standing waveE and reflections
directive
from hard" surfaces
changes
or loud.speakers
the requi.red improvement.
be consi{erabl.y more expensive than
equalisers.
Loudspeakers shouldl be inspecterL to ensure they are operating
if
response
high-freguency
attemrators
are used in the cross-over
should be set to minimum attenuation.
networks these
Unnecessary attenuation
roud.speaker or cross-over network would otherwise be offset
unnecessany boosting by the equaliser.
correctly,
by the
by
Any boosting by an equaliser
c - 3
red.uces the overload margin of the power arnplifier
which may cause
cause excessive heating and/or increased distortion.
In sturlio control
are critically
rooms and other situations
observed. the relative
charrnels is of considerable
applieil to a monitor its
acoustic
phase of the two (or four)
importo[cse
When equalisation
phaee response is changed as its
is
electr-
freguency response is changed. and eo when equalising
stereo eystem the amount of eoualisation
speaker should be very similar.
if
where stereo images
large,
will
cause audible
apparent than the earlier
a
anplieil to each loud-
Differences
in equalisation
image widening that
applied,
may be more
response d"ifferences.
Tape Machine Alignment
Pink noise a.nd a real
effectively
veri-fy the recorcl/replay
Once an in-house
full
response of a tape recorder.
stand,ard. pink noise tape has been produced the
autlio band replay
in a fraction
tape.
time analyser can be used to simply and
response of a tape machine can be checked
of the time of n:nning a rtone runt replay calibration
This time saving is of consid.erable advantage when checking
the replay
and record/replay
characteristics
of multi-track
machines.
Pink noise injected. on to the head of a tape could. ensune that
the
tape woultl play back correctly
more
infozmation
1OkHz toneg.
is available
certain
on other machines, considerably
with pink noise than with
1OOHz, lkEz and
tape machines have independ.ent high freguency
slope and peaking controls.
adjustment of these controls
Using pink noise and an anal.yser,
is considerably
simplified.
D - 1
TECHNICALDESCRIP{TION
AND SERVICING
Unit Disassembly
To disassemble the analyser the four screws and side-p1.ate adjacent
to the Mike rnput socket should be removed.. Top and bottom covers
may then be slid
out.
rf necessary the acrewa holding the remaining
side prate may be roosened but it
is advisable not to remove both
end prates as und.ue stress may then be placec on the printed
board. llith
circuit
t o p a n r l b o t t o m c o v e r a r e m o v e d .a c c e s a i s p r o v i d e d t o a l l
circuitry.
User adjustable
Pre-set
Controls
Analyser should be ,lisassembled as clescribed above.
t ) Ptite Sensitivity
llicrophone pre-alnpl.ifier
gain may be varied. over a 1{dB ran61eusing
the pre-set potentiometer sltuated between I.C.2 and I.C.j.
u s i n g a s o u n d .l e v e l c a l i b r a t o r
it
is possible to caribrate
widebanc channel of the analyser to indicate
pressure level)
for the particular
aB(flat)
spl,
the
(soun,l
instrumentation microphone useC.
e) WiaeUand Channel Cain
The wideband lever detector
than the third-octave
is factory
band d.etectors.
have the same gain using the pre-set
r.c.33
and r.c.2.
set to have lodB rower gain
rf requi.red it
potentiometer
may be set to
situateC between
when d.epressing the Graticure button and feed.ing
a sine wave signal
is rotated. to raise
to the anaryser (1kHz say) the pre-set
control
the wideband channel step height by 1odB.
D - 2
IJ
a
.
t ?
4J
1
t-) 9
t
7_t
'o2
x
>Y
v l
7 5
c
c,o
r
l*1,
+l
v
+t
a
-t
,A
xi
>-J
1
o
c
IJ
r,{
\
tr
s
t-
d
t<
h0
d
t .
.d
,
I
tU
.-&
t
x
tr
o
\o
O
!
,A
z
t
!
E
6
o
b
ca
E-r
E
o
c
F,
\^
\ *il
.j-.cI,
;r qi -(
l E
I
YJ As" l l
E R
-€ \ dE
l;t
J
l -a^l
$llv-
rJ r
A\s-tn
I
t
o
I
o -O
-{
, e
i,-rt g
I
:
UrU
pqrtl
JZt 5l
l
) .=
3 ' lI
n
_ _-tJ
I
v
)
J
c
z
2z
trU
.d
h
D _ l
Circuit
Description
Except for
and rear panel hardware all
front
analyser is housed on a single
printe,l
circuitry
circuit
board.. Section B
of the handbook contains a simprified. circuit
description
shows the analyser in block diagram form. Fig.s
complete circuitry
of the analyser.
powering for
12 volts
(input
selector
control)
switch.
sensitivity
primary with
to the input
a switched attenuator
The i.nput transformer
(input
before reachj.ng the
has a centre-tapped
12 vol,t phantom powering provicled. vra 41O ohms.
The selected input channel feeds 1.c.4r the filter
This arnprifier
has variable
adjustment (input
the 30 filters,
control).
r.c.4
d.rives the inputs of
the wideband channel rectifier
Signal level
at the input of the filters
for full
scale defLectlon
are of the
level
and
(+1OdB)
is over
i.s a fast attack - slow
psing a transistor
The 30 bandpass firters
(lever detector)
is about 316mV,clipping
The overload. ind"icator, l.C.39r
release peak detector
amplifier.
driver
feedback to provi.d.e a 20ctB range of gain
sensitivity
the overload indicator.
6 volts.
attenuators
passes through the
signal
ancl a gecond pre-arnplifier
ewitch.
The
operation.
switchei
pre-arnprifiers
one pre-arnprifier,
control)
selector
and buffer
The microphone input
input transformer,
input
111 or 2lo volt
si.gnals passvia the bypass switch,
sensitivity
providee
circuit
arr the analyser circuitry.
mains transformer may be strapped for
Line input
and Fig.'/.
i2 to 1) ehow the
A standard. maj.ns transformer/rectifier/regulator
the + and -
for the
array.
rsingle-pole-pairt
type with a
nominal Q of 4.32 a.nd a mid-band, gain of about'lod.B. Each filter
feeds a Ieve1 d.etector comprising a precision
and RC integrator.
rn the fast
balristics
mode the attack
constants are formed. by the 10k reeietor
srow balrietics
parallel
with
has no firter
and 2w2 capacitor.
the 2v2 capacitor
in each channel.
and the rectifier
has pre-set
selects
rn the
The wideband channel
actjustable gain.
outputs feed four anal,ogmurtiplexers,
Timing waveforms from the counter (r.c.{6)
for
time-
modeF.E.T. switches switch a 2zu capacitor in
The 31 integrator
inputs
half-H&v€ rectifier
each murtiplexer
each multiplerer
and r.c.4T,
in sequence.
r.c.s35 to38.
serect one of the eight
a one-of-four
d.ecod.er,
D - 4
The output pins of the murtiplexers
are joi.ned and the histogram
(stepped graph) signar is fed to a logarithmic arnplifier in orrter
to give a f linear-d.ecibe1I vertical
,iieplay. The non-Ij.near
()"ogarithmic 1aw) amplifier is a murtipre srope function generator
where r.c.40
further
2.!
has signal
dependent gain.
feedback resistors
At increasing
signal
levers
are switched in to recuce the gain.
vorts D.c. output from a level detector is set to produce
1.0 volts
output from the rogarithmlc arnplfier (at pin 1 of r.c.51)
with the set +1OdB(rurt scale deflection) preset contror. 2)omvorts
D.c. output from a leve1 d"etector is setjust
output from the logarithmic
with the -'lodB (zero scale
preset control.
deflection)
All
arnplifier
to prod.uce 0 volts
timing waveforms are derived from a clock oscil).ator,
which oscillates
the counter,
at approximatery 1 .6kllz. This waveform is fed to
r.c.46,
which provid.es alr. the harmonicarly related
sQuare-waves used. for
rarnp and display
sequencing the multiplexer
mode logic
deflection
synchronised to the multiplexer
scanning rate.
r,c.44t
the ramp logic.
anc driving
the
circuitry.
fn analyser mode the horizontal
itselfr
r.c.45,
eignal
is a ramp waveforrn
The rarnp generator
is a switched operationar integrator
controll_ed by
whilst
the counter counts from o to J0 (and the
sequences through the 3l channets) the ramp output runs
multiplexer
up. Mren the counter reaches J1 the ramp ]ogic
resets the ramp output
to zero. 0n the following
channel is
starts
eelected
count (zero again) tire lowest frequency
(25H2) and the operational integrator output
to run up again. The integrator
output reaches about 5 to 6
volts before being reset (pin 1 of f.C.44).
The output histogram from the logarithmi.c amplifier
output buffer
arnplifier
The ramp oscillator
arnprifier
drive
v i a t h e d i s p l a y m o d . es w i t c h r . c . 5 1 .
feeds the horizontal
mode switch r.c.50.
gain inverting
the calibration
oscilloscope
buffers
similarly
via the display
comprise of unity
rotating
r.c.jz
feeds the vertical
control
output buffer
The buffer
and. non-inverting
arnplfiers
stag.es so that
by
from one extreme to the other an
signar of elther
polarity
is available.
feed the output sockets via the bypass switch.
The output
D _'. ,
'l'he two line
signals
frorn the
a r e a r n p J . i fi e r l a n ' 1 a l ) . ( j . o l ' f ' s e l o t ' l b o u t 2 . ) v o l t s
where they
aCCeC. These signals,
< : l a . m p e cvl i a
driven
i.nput pre-a.inpIif i"ers are i'e:l to
clio.le networks
2.!0
so that
r i i .s p l a y
OdB anC -10d8 f.,;raticule Iines.
signal,s
-
for
the
voltages
the counter,
the
line
timing
-
signals
waveforms frorn the counter
pass the
line
signals
is
-
the
a p p r o x i . r n a t e l y 2 O r n s e c s)
tlie histograrn anii the
passes
three
l,,y ttmins" wavel'orrns f'rorn
In Xf i mo,le I.0.50
frorn r.c.49
+1Odii,
so provirle
b u t t o r r i . s d e p r e s s e ' i I , , . ) . ' - ) os t i l L
s€€ Fig.).
wrtii
inorie I. (;. t1 passes the
r a n n s i , , , ' 6 a 1a n
(scan rate
now selects
are not
moLle sr.ritch rs al so led
in a sequence controlled
I.C.46
input
I.0,51
c l r s p I a . , yr r r o , : l es w i . t c h e s , a r e
r 1 rs p l a y n r o l e s w i t c h e s
In analyser
rlisplay
rt' tlie graticule
rarnp signa). but
5paticule
to
analyser
i s
I'or tiier getrerat:.orroi'the
anc r. c.'r0 passes the
the
see Fig.B.
the
and 0.O vcilts
volts
histogra.rn signal
t'ed to the
'l'he vertica"l
negativel,.y.
l.OO voltsr
wliiclt are
I. t;.4,,
an:l LC.j1
see Fig. 1o. In
s'"ritch I.c.r0
r b o t h r r n o , l et h e
an1 I.0.5l
and ana).yser waveforrns -
pass
alternateiy
see l.irr.li.
The pink noise generator cornprisesr ,c.j4
a n , 1 1. , ) , j , l . r . 0 . 1 { i s a i r { : 1 t a l
pseuio-ran,lom whj-te noise gerrerator with approxirnately 'lookHz clock
r a t e a n d a b o u t l . J H z r e p e t i t i o n r a t e . T t i e r r a n r l o m r s q : L a r e - v r a v en o i s e
1s fed to I.C. !l
slope falring
anrt the associaterl I?0networrs wlrich has a Jdll/octave
w i t h f r e q u e n c y . ' l h e r . e s u l t i n p p r n i r .n o i s e i " s r ' e . i t o t h e
output socket via an output level
control.
Braro
! r 6 . v .
Horizontal anC vertical
outputs, anai;lser mo e,
pink norse berng displaye,l
I i ' ig . 9 .
Ilorizontal
and vertical
output,
analyser
moile wi ilr ;.rat icul e
nnGsL.'
-5s
I
lli"
:t:_._
BtHr,,
Fig. 10.
llorizontal
and vertical
outputs , X/\
Ficr.1f .
ilorizontal-
and vertical
outputs,
morlel pi.nk norse lnput
iSoth rnode, pirrk rioi.se rnput
D - 7
Service Hints
Required Equipment:
1)
DuaI BearnOscilloscope
2)
High Impedance Digital
Voltmeter
Desirable Equipment:
1)
Sinewave Oscillator
2)
Audio lilillivoltmeter
3)
Digital
Fbequency tr{eter
rn fault-finding
voltages and waveforms should be checked at thei.r
source and destination.
1)
Check supply rails
2)
Check timing
+ a:rd - 12 volte +5/"
waveforms from counter.
-should be O to +12 volt
serar€-waveso I.C.46 ping - S0Oltzr pin] - {00H2, pin6 - 20OHz,
pin5 - 10OHz, pinS - JOHz, pin2 - 2JHz, and pin{ - 1Z.JtIz
3)
ff
one filter
band fails
band close in frequency.
used as a signal
source.
compare its
operation with a working
Pink noise or sine-wave tone may be
D - B
o-
o
a
'o
o
!r'
+
a
U A
l F 7
2tY
H l -
o
6 g
a o
o
t
t
e
I
tl'!
r'l
6
r
{t
J
v
(a
f{
q)
\,
t
71
d,
P
t
..'i
t{
k
0)
l- .)
2 lt,
+
Z\)
trr
.ra
C , J
(t
q
t
t{
o
H
P
O
I
0)
+
t
d
H
H
@
Fr
.r{
(+{
.r{
-l
A
I
q)
k
o
l a o,
v-=3
I
P
a
3,' R 2
H
2 ' - l -
2
2 7
- l ! r 4
:(
U
, t " 9 i
F e { F c . l
G{
t
9-"
ii
E
o
N
d
t
o o
t-
o
o
*-1
r t
4
!--+
d
c,
lD
o-
z
-
i , n F$ F 3
N
a0
'r{
D - 9
a
- -
g g 6 f i f i i " , ' d€ E r r r r _ F F E € S g S S S €
a
. . + T E N N N S P P 9 + + + " i d J d : F I: E
S q N N N N F ; ; F l
rJ
.
d
t
9
E
-
o
gr€Hn*aHeH
-"$lsRs$
r$$
H3fl
e5c
sx3c
c
@
E
o
@
n
<
f
,
C
O
O
E
F ?
O
o
A
>
c
t-1
f
)
J
.
H
o
+
r
o
E
.rl
6
r
4 0
6
O
, i ^ - n - -^ g : P 3 : 5 P : g E R e Ns S s Hs R $ g ; s n 3
t{
f
-F \ i o S t o{
"-€rfrSf,$il#i il€6fi#s{frgi*s 6N#5i*S#*
c
o
q
o
A
6
i
o
".8E6EEsf,isii Ef,iEsil$sf,iEti Estis i
D
o
t
O
\
o
N
H
a
c
X
U
Fl
.Fl
]J
n
E
(5
R
f,;
vl
d
a
L
T
tr,
.tJ
I
t
L
"'
\
I
+)
c)
}1
(
Fi
()
R
{t
$+h
q
N
t
t
o
ql
{
vo
l,i
14
\J
,$
,i
?
@
\4t
h'1"
e{
6
r:<
d
st
il
F
+
\
s
\c
1.\ r T
{It
t
$st $ i
q
t
U
+l
l
-
a
a .
a)
1)
Fl
.-l
tr.
g c
H4r
s
trU
rJs
hi
a
N . J
u d
U
l{
€
lrt
r{ cl
ex
{ :
c+ 3
ai s!
.
al
i6!8
IA
\
R
{
ii
cl
oO
Vr
q
.f.
N
-1
$
1,!
s33$
$x
h,
.-l
l&
u.4
:*
q
lJR
?
c
0
(l
{l
I
t
\0h
He
t
?o
k
\4
c4
D -
J
a \
r4 .v
t
' J
tr
{u
q
rr,
\ \ F
\t
€
a s
t
i
\ tt
t
\
s
R!S
:
o6
'e
l,
\
F
!rf;
h
a
r;
d
<-0
J
rl
H
<-
+)
.Fi
t
lo
n
-l
a\
a
.rl
U
o
o
c{ Ol
/
ns
I
{
ro \t
V1
$
,
E
+-
h
g
ra'
T
#
r r
,
v
d
x Y
S
J
0.
I
o v i
o > :
H
10
o
'
0
z
-
oa
t
A
a
.Fl
4.
J
(1
d
1
I
v
3r
F
t
cl
il3fl
{
F
^
1J
d
L
+
t1P
:(
1*S
ra
.x ,\ 1, 1 j
'H -{
< J
st
-
s
l-
!i
n\
a
d
o
n\
rt
J9 e,.r-e
(
d
{J
F
:f
H
cl
?
)
aa
o
a
d
*
l.)
.t
al
n
t
ti'
t
II
a
nl
o
t
G
x
o
o
t\
B
u
rJ
H
+J
t
-{v
rli
ii$
gk's
., ,0 ! i
g H
$l
r q
sZ L2
tl.
?! r'
ta
<iy
?
o
{
ts
Q
Y
so
I
5
7
-
v
O
^
Fl
Q
U
lr
ii
rf
d
va
T
'
@
o
- v
t+
o
c1 fn
.+
(ao
tJ.
U
se
!,U
H d
H
\.
d
.0
o
a+ ,
h
F
U
' i'
,
I
o
g
+
D
-i1 ( v',
A =
-{
J d
n\
.Fl
+r
.rl
_{
A
O
._l
d
p
@ o ! z o
#9
v
9
o
.O
V1
q
t
d
t{
4
t
._l
L
C!
b,
h
F.1
H{
$
t
n
v
.
t
r
x Fs il
. { E G c l
* 3
g?
o
H
M
v
gil
rq
-t
f
a0
.Fl
o
*
i\ i€ i l
lI"
D -
t4
i+$
'3$
h
ii$
dld
n
r!
+
u
h
t
q
;
Lf
r;
.(
\
^\ lo'
,(
\
t
FI
d 1 4
IEE
I t
I t-j
G E
gH
O
3i
fil
.J
Fi
f,.4
L U
3h
1+
3-;
a
(
O
> H
3
o
qta
STH
aa
o
;.. i +
+
!.r
H
tn
fil
fr
u
F
sr.i Ps
kr
ul
1l
H
a
tlJ
a ' 5
+J
(0
ln
t n \ u
a
\ J ( ^
h
;
a
F
r 4 4
U ;
Y
e
\
L
o
H
Ca
G
?
o
c)
a
'F{
z
d
u,
7
.Fl
0
0-
r.o
;f
3
tr)
J
H
P
u
o
b,
.ri
tL.
I
E
3:
au
3,1
- Ti
3ui
it hi (3
,,
[*LfJ
elq
I
!.; t -lt
i f
d,r -'r
I
:
I t
s
(a
\
u
D - t 2
3'
?r l .6q
'i
9d J=
.G
t6
u9
dg
HS!
{
-G'
rH^Y l
J-. t r
lJ)
;8
H€,
E t ] n
l
-
t
g? s ieg
-J
g3
r3
sg
$U #
<.1
HE;
u
r-1 r-| r1
tl
l
t
l
_
l.
a
.g
'q
:i \19 #
of
iFIg
"O
IJ
H
H
[:]
-G
td
s
&_l
j
rg
^a
3
gr-J
n n n n [| n=gn
rg
!g
t]tl
$*.
E3
i$:
g
sg fi3
d.
r u.{!
n n
F€,
r-a
l
l
.{J
F
r)
a
Ft
[]
+)
('"1
13 ig
n u
cJd J
iE
8s
gEEI
o?
o"€
,3
Fte
r---'l
D N
trg
tr*
I
la
I
,__E__
t
J
H
G
iv-- oo
c?
tr rf
F=.
"3
J O
FQ9
n
r-13
b
U
.l
a
i,
lfi
I
ILJ
H
6
U
H
t - l
I
lo
[-l
?
+
H
J
l.
l
t4
r:l
J
H
r,
H
r..-F=FI
t - l
la
I
dr
:p
$Errl
*-f't
a e e ng
*
h
\n
H
fL
o
l$
d
H
!,
n
F
la
.J
b!
.Fl
u
tO
l.
il
e9
d3
F-l1
b
d
(J
ABACL.|S
10 Barley Mow Passage
Chiswick London W4 4PH
Tefephone01-9946477
Telex 8811418
SPACESG
ELECTF|ICS
A R T A 6 0 0 A U D I O S P E C T R U MA N A L Y S E R
A D H E S I V E L A B E L F O R O S C I L L O S C O P ES C R E E N
In
noted
on
Analyser
the
divisions
individual
oscilloscope
Adaptor
This
common
that
order
label
-
label
assumes that
the
handbook
with
graticule
division.
The
three
label
oscilloscope
may need to
UK Reg. No. A74723
of
and that
has been labelled
screen
an adhesive
horizontally
size
frequency
the
is
ie
everv
ARTA 600
width
divisions
graticule
has ten
- this
is
for
the
most
as per
the
each
horizontal
each graticule
band for
division
octave.
the
trace
over
is
the
not
lower
part
obscured.
of
the
The label
be trimmed.
52
65
125
Zln
JOO
Frtqurncy
lk
2k
lbrt:
sk
16k
s2
63
l25
m
500
Frrqurncy
lk
2k
lbrtz
at
r6k
VAT Reg. No. 224 865747
Audio
provided.
ARTA 600 has been aligned
be positioned
so that
the
oscilloscope
third-octave
should
screen
when using
one centimetre
The central
-
bands may be more easily