EasyManua.ls Logo

HP 416A - Page 26

HP 416A
109 pages
Save Page as PDF
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
3.
While
manually
sweeping
the
Model
670HM'
oscillator
,
adjust
the
ATTENUATION
control
on
the
Model
670HM,
and
watch
the
tuning
eye
on
the
Mo
de
l
416A.
Adjust
the
ATTENUATION
control
to
obtain,
over
the
frequency
range,
an
approxirnately
1 /8
11
gap
in
the
tuning
eye
shutter.
4.
On
the
Model
670HM,
set
the
SELECTOR
switch
at
SWEEP.
5.
On
the
Model
416A:
a.
Set
the
RANGE
switch
at
the
0
DB
l
00%
position
.
b.
Disconnect
the
cable
from
the
REFLECTED
/PROBE
input
con-
nector.
This
sets
up
a
con<lition
of
zero
reflection.
6.
On
the
Oscilloscope:
a.
A
horizontal
trace
should
appear
on
the
oscilloscope
.
The
osc
il-
loscope
horizontal
-
sweep
voltage
is
supplied
-
from
the
Model
670
FlM
and
is
synchronized
with
the
frequencies
being
swept.
The
oscil
-
loscope
vertical
amplifier
is
connected
to
the
Model
41
6A ,
and
under
a
zero
reflec
tion
condi
ti
on
there
will
be
essentially
zero
voltage
on
the
vertical
plates
(
actually
a
few
tenths
of
a
volt).
,
b.
Adjust
the
horizontal
amplifier
for
d-c
ope
ration
and
proper
de
-
flection
to
position
the
hor
i
zontal
trace
abou
t
one
i
nch
below
ce
nter.
Usually
it
is
necessary
to
adjust
the
vertical
and
horizontal
con-
trols.
Thus
the
zero
reflection
line
is
established.
7.
On
the
Mode
l
416A
:
a.
Reconnect
the
reflected
detector
cable
to
the
REFLECTED/PROBE
input
connecto
r.
There
is
a
short
across
the
line,
and
therefore
there
now
exists
a
condition
of
1
00%
reflection.
b.
Adjust
the
SET
TO
FULL
SCALE
control
on
the
Model
416A
to
ob
-
tain
an
indica
tion
of
100%.
NOTE
:
If
a l
00%
i
ndication
cannot
be
obtained,
it
indicates
that
there
i s a
difference
in
the
rectification
efficiency
of
the
two
detectors
,
and
that
the
detector
with
the
l
ower
ef-
ficiency
i s
in
the
reflected
channel.
Therefore
the
two
det
ectors
shou
ld
be
reversed
as
it
is
desirable
that
the
detector
with
the
g
rea
ter
efficie
n
cy
be
placed
in
the
re-
flected
channel.
(If
the
differenc
e
in
rectification
efficiency
between
the
two
detectors
is
less
than
6
db,
sufficient
gain
ca
n
be
inserted
by
the
SET
TO
FULL
SCALE
control
to
compensate
for
the
di
ffere
nce.)
-1
6-

Related product manuals