Model 333A/334A
RANGE
100%-0.3%
0.1%
Section
I
*3%
*ts%
*12%
1MHz
3MHz
10
HZ
10H~
30
Hz
20
Hz
10 Hz
300
kHz
500
Wz
1.2
MHz
SECTION
I
GENERAL INFORMATION
1-1.
DESCRIPTION.
1-2.
The Hewlett-Packard Models 333A
and
334A
Distortion
Analyzers axe solid
state
instruments for
measuring distortion on ac voltages. The
Models
333A and 334A include
two
control loops
that
auto-
maticdy
tune
both
legs of
a
bridge
circuit which
re-
jects the fundamental when the rejection circuit
is
initially
set
within the
range
of
the loops. The 334A
has
a
high
impedance detector which operates from
550
Mz
to
greater
than
65
MHz and provides the ca-
pability
of
monitoring the distortion of the amplitude
modulation on an
rf
carrier.
1-3.
Distortion levels
of
0.1% to 100% full scale
are
measured in seven ranges for any fundamental frequen-
cy of
5
Hz
to
600
Wz.
Harmonics are indicated upto
3
MHz.
The high sensitivity of these instruments re-
quires only 0.3V rms for the 100% set level reference.
The distortion characteristics can
be
monitored atthe
OUTPUT connectors with an oscilloscope,
a
true rms
voltmeter, or
a
wave analyzer. The instruments are
capable of an isolation voltage of 400 volts above
chassis ground.
1-4. The voltmeter can
be
used separately for general
purpose voltage and gain measurements.
It
has
a
frequency range of
5
Hz
to 3
MHz
(20
Hz
to
500
Mz
for 300 pV
range)
and
a
voltage range of 300pV to
300
V
rms full scale.
1-5. The
AM
detector included in the Model 334A
is
a
broadband dc restoring peak detector consisting of
a
semiconductor diode and
filter
circuit.
AM
distor-
tion levels
as
low
as
0.3% can be measured on
a
3
V
to
8
V
rms
carrier modulated 30% in the standard
broadcast band. Distortion less than
1%
can
be
measured
at
the 8ame level of the carrier up to
65
Mc.
1-6. ACCESSORY FEATURES.
1-7. The accessory available with the 333Aand334A
Distortion Analyzers
is
a
voltage divider probe, -hp-
Model No. 10001A. The features
of
the probe are:
a.
10 megohms shunted
by
10 pF, giving
1O:l
b.
c.
2%
division accuracy.
d.
600Vpeakinput.
e.
5
ns rise-time.
attenuation.
DC
to 30 MHz bandwidth.
1-8.
OPTION.
1-9. Option 01
is
a
standard -hp- Model 333A
or
334A
with
a
special meter and meter amplifier, compen-
sated to permit response to
W
(volume
units)
character istic
8.
1-10
INSTRUMENT IDENTICATION.
1-11.
Hewlett-Packard uses
a
two-section
serial
number. The first section (prefix) identifies
a
series
of instruments. The
last
section (suffjx) identifies
a
particular instrument within the series.
If
a letter
is
included with the serial number, it identifies the coun-
try in which the instrument
was
manufactured.
If
the
serial prefix
of
your
instrument differs from the one
on the title page of this manual,
a
change sheet
will
be
supplied to make this manual cornpatable
with
new-
er instruments
or
the backdating information in Appen-
dix
C will
adapt this manual to earlier instruments.
All correspondence with Hewlett -Packard should in-
clude the complete serial number.
Table
1-1.
Specifications
MODEL 333A
Fundamental
Input
Greater Than 30
V
DISTORTION MEASUREMENT RANGE
Any fundamental frequency,
5
Hz to
600
kHz.
Distortion levels of
0.
1%-100% are measured
full scale
in
7
ranges.
Harmonic measurement accuracy
(full
scale)
Fundamental Input Less Than 30
V
DISTORTION MEASUREMENT
ACCURACY
RANGE
I
*3%
1
*6%
I
*12%
50 Hz
Elimination Characteristics:
Fundamental Rejection
>
80
dB
Second Harmonic Accuracy for
a
fundamental
of:
5
Hz
to 20 Hz: better than
+1
dB
20 Hz to 20
Wz:
better than
4.6
dB
20
kHz
to 100
kHz:
better
than
-1
dB
100
Wz
to 300
kHz:
better than -2 dB
300
kHz
to
600
kHz:
better
than -3 dB
1-1
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