Page 1
DISTORTION
ANALYZER
• A
NEW
• SHOWS
•
STANDARD
• ANY
•
SAVES
FREQUENCIES
INSTRUMENT
TYPE
OF
MODELS
TIME
IN
DEVELOPMENT
MODEL
The
FOR
DISTORTION
DISTORTION
FOR
MEASUREMENTSATTWO
FROM
50
Model
AS
TO
AND
320A
320AR
MEASUREMENTS
WELL
10,000
AS
CYCLES
PRODUCTION
AMOUNT
OR
AVAILABLE
TESTING
SIX
FREQUENCIES
USES:
and
harmonic
particularly
it
at
excellent
ate
operation.
The
compare
damental
a
observed.
the
age
the
the
used
which Measures
The Model
convenient
distortioninaudio
the
character
the
same
for
and
providesarapid
Model
the
cathode
voltage.
oscilloscope
will
appear,
voltage
Model
alone
suitable
time
320isessentially a
ray oscilloscope
The various
being
320isa
but
320A
Distortion Analyzerisa simple
device
and
production
distortion
pattern,
the
for
studying
for
development
typeofdistortion
the
distortionisbeing
work
and
contentofthe
When
this
the
order
the
andagreat
analyzed
also when used with
canbeobtained.
valuable
total
r.m.s.
and
measuring
frequency
becauseitis
accurate
comparison
comparisonismade
typeofdistortion
harmonics
hum
dealofinformation
instrument
distortion
apparatus.
work
because
canbedetermined
measured.
easytooper-
check for normal
device
wave
with
will
voltage
show up on
and
not
other
directly.
the
It
with
It
used
the
funwith
can
noise volt-
about
In
this
way
only when
equipment
to
be
DESCRIPTION:
band
is
is
cycles
calibrated
adjusted
eliminated
the
or
has
elimination filterisswitched
atorisintroduced.
mentalisincreased
same
MEASUREMENTS:
tingofthe
amplitudeofthe
fundamental.
tector,
elimination filters,
and
one
attenuator.
to
the
completely.
harmonics
measured
been
magnitudeasthe
measurements
can
with a sensitive
adjustedsothe
attenuatoronthe
When
The
distortion
for
measurementsat5,000
With
proper
The residual
thenbeobserved
Then
until
the
residual harmonics alone.
With
harmonic
an oscilloscopeisused
of
analyzer
one
for
the
frequency
meter.
fundamentaliseliminated,
out
andacalibrated
the
attenuationofthe
fundamental
the
proper
instrument
voltageindecibels
the
harmonic
consistsoftwo
measurements
cycles,
voltagetobe
the
fundamental
voltage
with an oscilloscope
When
adjustment,
the
voltage
gives
voltage
containing
frequency
directly
below
for
at
400
and
analyzed
the
attenu-
funda-
has
the
the
set-
the
the
the
de-
require
a
is
T-102
Page 2
some
exerciseofjudgment.
will
contain
tain
countinestimating
residual harmonic
If
more
be
usedinplaceofthe
With
it.
be
made
the
more
DISTORTION ANALYSIS: For
oscilloscope should
quencyisadjustedtoeliminate
sharp
very little
accurate
energy
such a
with as
expensive distortion
peaksinmany cases. These peaks con-
voltage.
measurements
meter
good
be
The residual
and
this shouldbetaken
the
r.m.s.oraverage
oscilloscopeorin
the
distortion
accuracyascanbeobtained
used as
are
desiredameter
measurements
meters.
distortion
the
detector.
the
fundamental,
harmonic
valueofthe
conjunction
analysis an
As
voltage
into
ac-
may
with
may
with
the
fre-
the
sec-
SPECIFICATIONS
ond,
posed
obtained
canbedetermined.
By
platesofthe
the
which
This
be
under
clipping,
sitics
third,
and
higher
order
on
the
fundamental
the
relative
placing
horizontal plates,
observed
the
residual harmonic
oscilloscope
the
distortion
instrumentisvery useful
while
test.
Common
sharp
cut-off,
canbediscovered
importance
and
the
occurs
changes
f.orms
transformer
quickly
harmonics
voltage,
the
particular
can
be
for
are
being
of
distortion
and
will
appear
and
from
of
these
voltage
fundamental
on
partofthe
determined.
developmentormain-
madeinthe
such as
saturation,
corrected.
super-
the
components
the
vertical
voltage
cycle
circuit
and
trace
on
at
peak
para-
FREQUENCY RANGE:
INPUT IMPEDANCE:
DISTORTION RANGE:
DETECTOR
MOUNTING:
SENSITIVITY:
Model
The
320B
other
for
The
input
increase
The filter circuits
Distortion values as low as
of
sufficient sensitivity.
The sensitivity
giveareadable
be
measured.
only. The usual oscilloscope with a
measure
input
be
used
requirements
isofinterest
distortion
The
Model
wrinkle
The
panelisfinishedinwrinkle
320Aisdesigned
is
designed
the
0.370ofa 30 volt
impedanceofthe
between
grey.
for
frequencies
impedanceisat
input
impedance.
will
of
the
indicationon0.1"10ofthe
The
detector
the
on such an amplifier
and
that
otherwise.
320Aismounted,inan
The Model 320AR fits
for
measurementsat50, 100, 400, 1000, 5000,
canbesupplied
least
20,000
provide
instrumentisdetermined
instrument
it have a high
more
0.1"10ofthe
need
fundamental.
detector
grey
notbecalibrated
mustbe100,000 ohmsorgreater.
and
measurementsat400
on special
ohms. A
than
60
fundamental
one
For
the
detectortoincrease
are
that
impedance
attractive
the
with
machine
order.
bridging
dbofattenuation
maybemeasured
by
the
detector.
fundamental
becauseitis
stage
amplifierissufficiently sensitive
proper
it must pass
oak
standard
operationofthe
input. It
cabinet
19" relay rack with
engraved
and
5000
cps.
The Model
and
7500
cps. Filters
transformer
if harmonicsof0.1"10
the
the
highest
need
with
maybeused
of
the
fundamental.
with a
The
detector
used
for
comparison
instrument
An
amplifier may
sensitivity. The only
harmonic which
not
be
free
the
panel
finished
%"
designations.
detector
should
are
the
from
spacing.
to
to
to
in
Model
320A
nOAR
320B
320BR
Mounting
Cabinet
Relay Rack
Cabinet
Relay
Rack
Length
12"
19"
16"
19"
f.o.b.
Palo Alto,
to
Prices
Prices
and
are
data
net
subject
HEWLETT-PACKARD
481
PAGE MILL ROAD
PALO ALTO,
CALIFORNIA
Height
8" 6"
5Y4" 5Y2"
8"
7"
change
California.
without
COMPANY
Depth
6" 15#
10"
notice.
Weight
8#
8#
20#
December
Price
$60.00
$65.00
$145.00
$150.00
10,
1940.
I
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