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4,
(Cont'd)
When
the
reflection from
the tuner is
180° out
of phase with
and
equal
in
magnitude
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
and
Si
gnal S
ource
-
The first step
in
setting
up a reflectom-
eter
system
is to connect the signal source to
i
ts power
supply
and
put
the
power
supply into
operati
on.
In the
typical S
-
ban
d
reflectometer setup
being
discussed,
the
signal source
is
a
H
e
wle
tt
-
~ackard
Mod
el
670SM S
HF Os
cillator (Swept)
and
its
power supply
is a Hewlett
-
Packard Model 717A Klystron Power
Suppl
y.
l.
On
the Mode
l
670SM Oscillator:
a.
Plug the power
caole
i
nto
a
115-vult, 50
=6
0 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
N
C
connector)
to
the, s
wee_
p
i,1put of
a
d-c oscilloscope.
e.
To
ensu
re
that
full
power is not
a
p
p
l
ied to equipment in the
r
e
-
Hectometer
syste
m
which
rna
y
be subject to bu
r
n =out
, the
AT
-
TENUATION control
shoul
d be
oet at
5.
(This control
is subject
to
re adjustme
nt
l
a
ter i
n
the
p
r
ocedure
when
putting the system
into operation.)
If an
external
attenuato
r
(waveguide attenuator) is included in the
reflectometer setup, the
Model 670SM ATTENUATION control
may
be set
at
0
,
and
attenuation
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
counterclockwise
.
I
-2
4
-
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