Model 3575A
I
Sectiorl I
SECTIO
N
GENEBA[
INFOR
ATION
dBV
(l
V rms
=
0
dBV).
Input levels from
0.2 mV rms
("
74 dBV) to 20 V rms
(+
26 dBV) can
be
measured
with
0.1 dBV resolution
in two
voltage ralges. When
bg
B/A is
selected, thc
panel
rneter indicates the relatiye amplitude of
the two input
signals
in
dB. The
display
range
for
relative
measurements
is
from
-
100 dB to
+
100
dB with 0.1 dB
resolution.
Since
the two input channels
each
contain
ac/dc
corverters and are totally
indgpendent, relatiye measure-
ments
can
be made between two signals that
dilfer
in
frequency.
1-7. The 3575A
amplitude
functions
are
particularly
useful
fbr
measuring
gain,
attenuation
and other characteristics
where amplitude
comparison is required.
The I-og B/A
function eliminates
the need for
separate input and
output
measurements
and time conslming
difference calculations.
1-8. Mlen Phase
Dsplay is selected,
the 35754 measures
the
phase
difference
between two input
signals. The
phase
measurement
range is from
-
180
degrees to
+
180 degrees
with 12 degees
overrange and
0.1
degree
display reso-
lution.
Due to
the wide dynalnic range of the
instrumelt,
phase
difference can
be measured between two signals
that
differ
in amplitude by
as
much
as 100 dB.
l-9. An accurate
phase
meter is of little value
unless the
accuracy oan
be maintained
in the
presence
of troise
and
distortion.
Udike conventional
phase
meters,
the 3575A
uses
two
phase
detectors rather
tian a single
phase
detector.
This, in conjunction
with a
highly
effective error
correction
scheme,
greatly
reduces the elfects
of noise and
distortion
on
phase
readings.
1-10.
SPECtFICATT0NS.
l-11.
Table l-1 is
a complete list of
the Model
35754
critical
specifications that
are controlled
by tolerances.
Table
l-2 contains
general
information
that
delcribes the
operatirg
characteristics of
the Model 3575A.
I-12. Any
changes ill
specifications due
to manufacturing,
design,
or traceahility
to the
U.S. National
Bureau
of
Standards
are
included in
Table
l-l
in
this manual_
Spscficatiols
listed
in this manual
supersede
all
previous
specfications for
the
Model 3575A.
1.13.0PTr0NS.
1-1.1.
There are
presently
three
instrument
and two acces-
sory options available
for the Model
3575A.
These options
are as
follorvs:
I
M
1.1.
D ESCRTPTT0
N.
1'1. The Hewlelt-Packard Model
1575A
Gain-Phase Meter
is a versatile.
wide-range
ac voltage
analyzer
which affords
diect. convenicnt
mcasurenent
of amplitude and
phasc
paranletcrs.
Thc nrajur
featurcs
of the instrument includg
broadband fiequertcl
response, wide dynamic
range,
digital
readout
plus
a
unique
detgction soheme which ensures
accurate
phase
measuremcnts in
the
prescnce
of noisc
artd
distortion. These standard leatures, along
with
a variety ol
options including
dual
panel
meters, BCID output and
remote control. nrake ths
-3575A
a truly flexible instrurnent
that
is well
suited
for
bench
or
systems applications.
l-3. rhc broadbrnd
liequency
response of
the Model
3575A extends frorl
I Hz to l3 Nlllz in
four
overlapping
frecluencl' rartges- For JnaxiJnum
operating
corlvenience,
each range is designed to cover a wide
band
of frequencies
while range seleciability allows the user to optinrize
measuremenl accuracv
ar:d scttling tinle
over
the
entire
frequencl
spe{l.unr.
l-4. The
-1575A
is equippcd
with
two
independent input
clunnels.
Each
channel
provides
an
lJodB dynamic range
which allorvs
"hands ,rff"
operatioii
with a wide range of
input
levels. In
addition, each channel is equipped
with a
20dB
input attenurtor rvhich
provides
an
extended
oper-
ating
capabiiit) ol
100 dB
in
two voltage rangcs. Input
sensitivity is fron
0.]
mV
rnrs b l V mls on the
lower
range and
I
mV nrrs
to 20
V
rins
on
the higher range. The I
Megohm
(
30
pF
input impedance of each channel
permits
the use of l0:l divider
probes
which
further extend
the
]rl&rinum input level
to ]00Vrms and the overall oper-
ating range to
I 20
d B.
l-5.
The i575A.ontains a
buiit-in dc digital
voltmeter
which
providcs
! direcl indication ol amplitudc or
phase
on
a 3 l/2 digil
(LLD)
display.
Lighted
annunciators oo the
panel
rlletcr indicatc dB V, dB or
degrees dependinB on
the
paranreter
being
rneasured.
Thc
pancl
nrctcr displa) is deter-
nlincd b) thc iiont
panel
Displa)
switch
rvhich
permits
selection oi AurplitLrde
or
Phase presentatiorl.
For recording
purposcs.
ar1 Analog Output
(BhvC)
connector is
providcd
on the rear
panel
ol thc instrument. The Ana)og
Output
supplies a dc voltage
proporlional
to the
panel
nteter
reading.
l-6. Wren
Amplitude Display is
selected, the
panel
Ineter
presentation
is
controlled
by the ftont
panel
Amplitude
Func'!io11
switch which
permits
selection
of
three different
functiols.
These
tunctions
are Log A,
Log B and Log ts/A.
When
Log
A
or Log B
is selected, the
panel
meter
indicates
the
logarithrnic
amplitude oI
the respectiye input
signal
in
1-l
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