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HP 416A - Page 10

HP 416A
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voltage
source
that
represents
the
denom
i
nator
of
the
ratio
to
be
measured
to
the
connector
d
esignated
INCIDENT
/REFERENCE.
(Without
this
signal
input,
when
the
ratio
meter
is
t
urned
on,
the
ratio
being
indeterminate,
the
meter
pointer
will
flu
ct
u
at
e
markedly.)
2 .
Plug
the
power
ca
ble
into
a
pow
er
line
of
spe
cifi
ed
voltage
and
fre
-
quency.
Turn
the
po
wer
switch
to
ON.
Allow
the
instrument
about
five
minutes
to
reach
a
state
of
stable
operation
.
3.
Connect
the
voltag
e
source
that
represents
the
numerator
of
the
ratio
to
be
me
a
sur
ed
to
th e
con
nector
designated
REFLECTED/PROBE.
4 .
Set
the
RANGE
switch
to
0
DB
100%
and
the
EXCESS
COUPLER
LOSS
switch
to
0
DB
.
(The
function
of
the
EXCESS
COUPLER
LOSS
switch
is
discussed
in
the
Appli
cat
ions
section.)
5.
Check
that
the
tuning
eye
(RF
POWER
MONITOR)
h
as
begun
to
close
but
is
not
completely
c
lo
sed
.
a,
If
the
eye
does
not
move
t
oward
closure:
( 1)
there
is
insufficient
i
nput
power
; i
ncrease
the
i
nput
level
at
the
source.
Or
(2)
the
modulation
voltage
on
the
sig
nal
is
not
1
kc
±
40
cycles;
adjust
the
modulating
v
ol
tage
at
the
source.
b .
If
the
eye
overlaps
by
more
than
1/32
11
,
either
of
two
conditions
(or
bo
th ) m a y
need
c o
rrecti
on
:
( 1)
Instrument
may
be
on
too
low
a
range;
check
that
the
RANGE
swit
ch
is
at
0
DB
100%;
if
at
0
DB
100%,
and
the
eye
is
closed
:
(2)
I
nput
level
is
t
oo
high
;
re
du
ce
the
i
nput
level
at
the
source.
6.
Calibrate
t
he
meter
for
full-scale
indication.
Full
-
scale
calibration
u
sually
is
achieved
by
providing
inp
u
ts
of
known
ratio
(usually
100%),
and
adjust
-
ing
the
SET
TO
FULL
SCALE
control
to
b
rin
g
the
meter
indication
exactly
to
that
of
the
known
ratio
(usually
1
00%
).
Two
examples
of
calibration
procedure
are
g
iven
belo
w.
Cal.~
_
brating
to
100%
reflecti
on
:
(
l)
By
externa
l
means
9
such
as
a
voltmeter
,
measure
the
two
inputs,
an
d s o
adjust
the
sources
that
the
two
inpu
ts
enter
the
ratio
meter
at
t
he
sa
me
leve
L
(2)
Adjust
the
SET
TO
FULL
SCALE
control
until
the
meter
indicates
exactly
100%
.
Calibr
ati
ng
to
les
s
than
1
00%
reflection
:
( 1)
Choose
the
desired
ratio,
25%
for
example.
By
external
means,
such
as
a
voltmeter,
measure
the
two
inputs
and
adjust
the
sources
so
that
the
level
of
the
signal
which
reaches
the
Model
416A
a.t
REFLECTED/
PROBE
is
25%
of
that
which
is
connected
to
INCIDENT
/REFERENCE.
(2)
Adjust
SET
TO
FULL
SCALE
to
obtain
a
meter
indication
of
exactly
25%.
-5-

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