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HP 416A - Page 56

HP 416A
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O'
0
r1l
d
~
r
~
r<
1-t
4)
r
~
r--
~
r--
N
r
~
p
r
i:t<
reference
channel,
the
amplitude
of
the
standing-wave
max
voltage
is
made
equal
to
that
of
the
reference
voltage.
And
therefore
the
max-to-min
standing-
wave
ratio
may
be
obtained
by
comparing
the
standing-wave
min
voltage
to
the
reference
voltage.
With
the
circuit
maintained
as
set
up
by
the
calibration
procedure,
the
standing-wave
min
voltage
will
undergo
the
same
degree
of
loss
or
gain
as
the
standing-wave
max
voltage,
and
therefore
a
condition
of
true
ratio
is
maintained.
To
obtain
the
standing-wave
min
volt?-ge,
the
probe
in
the
slotted
line
is
moved
along
the
line
until
the
point
of
standing-wave
minimum
amplitude
is
found.
With
the
probe
at
the
node,
the
indica.tion
given
on
the
Model
416A
meter
is
the
ratio
of
the
standing-wave
maximum
(
11
l11
by
virtue
of
the
cali-
bration)
to
the
standing-wave
minimum
(node
voltage
in
the
Model
416A
probe
channel).
For
instance,
if,
with
the
probe
at
the
standing-wave
node,
the
voltage
in
the
probe
channel
is
O. 2
volt,
the
Model
416A
(on
the
SWR
scale)
will
indicate
5,
which
is
the
ratio
of
NOTE:
1
{voltage
proportional
to
standing
1
-wave
max)
O. 2
(voltage
proportional
to
standing-wave
min)
When
the
ratio
meter
is
used
in
a
slotted-line
system,
the
indication
on
the
PERCENT
REF.I,,ECTION
(REFLECTOM-
E
TER)
scale
is
irrel
eva
nt,
does
not
indicate
the
reflection
coefficient
of
the
load
under
measurement,
and
cannot
be
used
to
calculate
the
standing-wave
ratio
from
the
formula
1 +
IP
I
1 -
IP
1 •
There
is
no
connection
between
the
indications
on
the
PERCENT
REFLECTION
and
SWR
scales
as
each
is
calibrated
for
use
only
in
its
particular
type
of
system.
-hp·
X421A
WAVEGUIDE
CRYSTAL DETECTOR
-hp-
416A
RATIO
METER
MOUNT
'--..,~~~~--~~~~
-hp-444A
BROADBAND
PROBE,UNTUNED
-hp-
X281A
WAVEGUIDE·
TO-COAX.
ADAPTER
·
hp-
809B
CARRIAGE
-hp· xa10 B SLOTTED SECTION
-hp-
620
A
SHF
SIGNAL
GENER
ATOR
'x'
Fig.
16.
Typical
Slotted
Line
System
Model
416A
Used
as
SWR
Indicator
Block
Diagram
-40-

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