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HP 416A User Manual

HP 416A
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General
Description
The
Model
416A
Ratio
M e
ter
makes
possible
the
rapid
,
direct
,
and
ac-
curate
measurement
of
t
he
ratio
of
the
amplitude
of
two
voltages
.
The
design
of
the
circuit
is
such
that
the
Model
416A
may
be
used
in
a
reflectometer
system
to
measure
the
reflection
coefficient
of
an
u
;::,
k
nown
load
as
a
funct
i
on
of
fre-
quency
over
a
wide
band
,
in
a
slotted
line
system
as
a
standing
wave
indicator,
or
for
general
applications.
A d - c v
olta
ge
proportional
to
the
ratio
indicated
by
the
meter
is
provided
for
oscilloscope
or
recorder
operation.
When
used
in
a
reflectometer
system
,
the
Model
416A
combines
the
voltages
proportional
to
incident
and
reflected
power
,
and
displays
their
ratio
irrespective
of
amplitude
var
i
ations
which
affect
both
channels
.
These
features
of
the
ratio
meter
eliminate
objections
previo
u
sly
associated
with
reflectometer
systems:
( 1)
corrections
required
as
a
res
u
lt
of
source
amplitude
variations;
(2)
the
necessity
for
makin
g
two
measurements
,
one
of
incident
and
the
other
of
reflected
power
,
and
calculatin
g
their
ratio.
When
the
reflectometer
system
signal
source
is
an
automat
i
cally
swept
oscillator,
and
an
oscilloscope
i s
con-
nected
to
the
Model
416A
,
an
oscilloscope
p :r
esentation
of
reflection
coefiicient
over
a
wide
frequency
ran
g e
may
be
obtained.
Thus
with
the
Model
416A
a
straight-forward
reflectometer
system
for
fast
production
checks,
broadband
system
alignment
,
and
l
abor
a
tory
investigations
is
a v
ailable.
The
Model
416A
is
particularly
ad
ap
ted
to
the
measurement
of
very
low
reflection
coefficients.
In
addition
to
its
application
in
a
reflectometer
system,
the
Model
416A
also
is
useful
as
a
standin
g
wa
v e
indicator
for
conventional
slotted
line
mea
-
surements.
In
this
application
, a
reference
v
olta
ge
derived
from
the
system
power
source
and
applied
to
the
Model
416A
eliminates
errors
resulting
from
power
source
amplitude
v
ariations
which
occur
during
the
measurement.
The
Model
416A
meter
i s
equipp
ed
with
three
scales
(percent
reflection
,
standing
wave
ratio
,
decibel)
and
four
ran
g
es
.
The
decibel
scale
may
be
used
with
either
of
the
other
two.
By
means
of
t},e
meter
multiplier
, a
ran
ge
of
40
db
is
available
when
square
-
law
dete
c
tors
are
used.
Operation
of
the
Model
4 1
6A
is
strai
g
ht
-
forward.
An
RF
POWER
MONI-
TOR
is
provided
on
the
control
panel
to
g
ive
visual
in
dication
of
whether
the
level
of
the
input
signals
is
wi
th
i n
operating
limits
for
the
instrument.
(Ad
-
justment
of
signal
power
is
made
at
the
external
power
source
. )
Only
one
adjustment
of
the
Mode
l
416A
is
necessary
dur
i ng
use.
A
condition
of
known
ratio
is
set
up
in
the
system
under
m
ea
surement
,
and
the
SET
TO
FULL
SCALE
control
on
the
Mod
e l
416A
panel
is
then
adjusted
so
that
the
meter
indicates
exact
ly
on
the
known
ratio
.
The
Model
416A
i s a r r
anged
so
that
it
may
be
operated
with
either
bar
-
retter
or
crystal
detectors
. A
source
of
approximately
17
ma
.
de
(8.
5
ma.
for
each
barret
t
:::
r )
is
provided
for
use
as
bias
current
for
the
barretters.
A
specially
-
designed
transformer
assembly
(Type
AC
-
60K)
is
available
(as
an
accessory)
for
use
with
barretters
.
The
two
transformers
in
the
assembly
provide
an
impedance
match
between
each
barretter
and
its
respective
Model
416A
input.
I-
C
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HP 416A Specifications

General IconGeneral
BrandHP
Model416A
CategoryMeasuring Instruments
LanguageEnglish

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