EasyManua.ls Logo

HP 416A - Electrical Full Scale Adjustment

HP 416A
109 pages
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.
Set
attenuator
#1
to
40
DB
,
and
attenuator
#2
to
0
DB
.
NOTE
:
With
a
10
-
volt
input
,
and
attenuator
# 1
set
for
40
DB
attenua-
tion,
the
output
at
attenuator
#1
will
be
100
millivolts.
4.
On
the
Model
416A,
set
the
EXCESS
COUPLER
LOSS
switch
to
0
DB.
5.
On
the
Model
416A,
adjust
variable
res
i
stor
R94
to
obtain
a
zero
meter
indication
.
The
R94
adjustment
is
located
on
the
top
deck
of
the
instru-
ment,
and
is
identified
in
Fig
.
20.
6.
Leave
the
test
set
-
up
intact,
and
perform
the
Electrical
Fu
ll
Scale
Adjustment.
Electrical
Full
Scale
Adjustment
-
1.
Set
the
Model
416A
on
its
left
(with
respect
to
the
front
of
the
con
-
trol
panel)
side
so
that
the
bottom
deck
of
the
ins
t
rument
will
be
accessible.
·
2 .
Set
attenuator
# 1
to
46
DB
.
3.
On
the
Model
416A
,
set
the
RANGE
switch
to
the
0
DB
100%
position
.
4.
Connect
the
external
voltmeter
to
the
input
side
of
capacitor
C2
7.
C2
7
is
on
the
bottom
deck
of
the
Model
416A
and
is
identified
in
Fig
.
21.
The
input
side
of
C27
is
connected
to
terminal
strip
TSl
,
also
identified
in
Fig
.
21
.
(Do
NOT
connect
the
voltmeter
to
p in 1
of
V5
. )
Set
the
voltmeter
to
indicate
on
the
. 3
volt
range.
5.
At
the
audio
oscillator
,
vary
the
frequency
to
obtain
peak
indica
-
tion
on
the
voltmeter
connected
to
C2
7.
6.
The
voltage
at
C27
should
be
approx
i
mately
100
millivolts
or
slightly
greater
.
If
necessary
,
adjust
attenuator
#1
to
obtain
a
voltage
of
this
level.
(A
typical
voltmeter
indication
at
this
point
might
be
120
. 0
milli
-
volts.)
Record
the
voltmeter
indication
,
to
t
he
th
i
rd
significant
figure
,
as
11
incident
volts''
.
7.
On
the
Model
416A
,
disconnect
the
incident
input
cable
and
connect
the
reflected
input
cable
.
8.
Adjust
the
SET
TO
FULL
SCALE
control
on
the
Model
416A
to
ob
-
tain
a
voltmeter
indication
of
1.
44
times
the
i
ncident
volts
reading
( ±1
%)
ob
-
tained
in
step
5 .
9.
Reconnect
the
incident
input
cable
to
the
INCIDENT
/REFERENCE
connector
on
the
Model
416A
.
Note
the
v
oltmeter
i
nd
i
cation
,
and
record
it
as
Voltage
A .
(This
resultant
voltage
,
present
at
the
input
to
capacitor
C2
7,
corresponds
to
Voltage
A
as
shown
in
F i
gs
. 3
and
5 . ) A
typical
Voltage
A
reading
might
be
174
millivolts
.
-
53
-

Related product manuals