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HP 416A - Page 37

HP 416A
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4,
(Cont'd)
When
the
reflection
from
the
tuner
is
180°
ou
t
of
phase
with
and
equal
in
magnitud
e
to
the
directivity
error
signal,
the
error
si
0
n
al
is
ca1
-
celed
out.
As
the
load
i s
moved
to
and
fro,
adjust
the
slide
screw
tuner
to
obtain
minimum
variation
of
the
pointer
on
the
Model
416A
meter.
NOTE
~
When
operating
in
the
S
band,
use
a
Model
S870A
Waveguide
Slide
Screw
Tuner
and
a
Model
S914A
Waveguide
Moving
Load.
Setup
(S
Band)
Power
upply
an
d Si
gnal
S
ource
-
The
first
step
in
setti
ng
up
a
reflectom-
eter
system
is
to
connect
the
signal
source
to
i
ts
power
supply
and
put
the
power
supply
into
operat
i
on.
In
the
typical
S -
ban
d
reflectometer
setup
bein
g
discussed,
the
signal
source
is
a
H
e
wle
tt
-
~ackard
Mo
d
el
670SM
S
HF
Os
ci
llator
(Swept)
and
its
power
supply
is
a
Hewlett
-
Packard
Model
717A
Klystron
Power
Supp
l
y.
l.
On
the
Mode
l
670SM
Oscillator:
a.
Plug
the
power
caole
i
nto
a
115-vult,
50
=60 c y
cle
power
s u r
ce.
The
receptacle
for
the
power
cable
is
on
the
rear
of
the
Mo
de
l
670SM
.
b.
Turn
the
SELECTOR
switch
to
REF
.
MOD.
Check
that
the
A.
C.
POWER
lamp
lights
and
that
the
fan
is
operating.
c.
Into
the
KL
YST
RON
POWER
receptacle
on
the
control
panel,
plug
the
output
cable
furnished
with
the
Model
717A.
\
d.
Connect
the
SWEEP
OUTPUT
{Type
B NC
connector)
to
the
, s
wee
_p
i,1put
of
a
d-c
oscilloscope.
e.
To
ensu
re
that
full
power
is
not
a ppl
ied
to
equipment
in
the
r e -
Hectometer
syst
e m
which
rn
a y
be
subject
to
bu
r n =
out
,
th
e
AT
-
TENUATION
control
shou
ld
be
oet
at
5.
(This
control
is
subject
to
re
adjustm
e
nt
la
ter
i n
the
p r
ocedure
when
putting
the
system
into
operat
io
n.)
If
an
external
attenuato
r
(w
aveguide
attenuator)
is
included
in
the
reflectometer
setup,
the
Model
670SM
ATTENUATION
control
may
be
set
at
0,
and
atten
uation
introduced
at
the
waveguide
attenuator.
2.
On
the
Mode
l
717A
Power
Supply:
a.
Check
t
hat
the
MOD
. S
ELECTOR
switch
,
REFLECTOR
RANGE
switch
,
and
POWER
switch
are
in
the
off
positions.
Turn
the
BIAS
VOLTS
contro
l
completely
countercloc
kwise
.
I
-2
4 -

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