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M.lcels
461A/4624
Section
V
Paragraphs
5-1
to
5-10
A
.A'
tECttoN v
MAINTENANCE
5-r.
tNtRoDUCTtON.
5-2-
This
section
uses
the
following
sequence:
Pe!-
formance Checks, Cabinet
Remolal, Calibration Pro-
ced$e,
Troubleshootilg, andRepair.
5.3.
TEST EOUIP'vIENT REQUIRED.
5-4.
The
critical
speciJications and
suggested
test
equipment
needed
in the pedormance ard
calibntion
procedures
are
given
in Table 5-1.
5-5-
PERFORIAANCE CHECKS
5-6.
The perlormance
checks
are in-cabinet Foce-
dures that ar€ used to
check
the
instruent
against
its
specifications.
These
procedures
can be used
as
periodic maintenance,
alter repair or
incoming
and
outgoing quarity
control
checks.
5-?.
Checks
lor
the
Models 4614
and
462.4
are pro-
vlded.
Theheadingoleachparagraphindicate6whether
theprocedue isapplicableto
one
orboth instruments.
5-8.
500
KC
GAIN
cHEcK
(461A and 462A).
a.
Connect
461-A.
as
shown
in Figue
5-l
with
the
ac
voltmeter
connected to
position A.
b.
SeL
lhe
os.illat
lo
500
KHz
rith
minimum
c.
Set
ihe coaxial
attenuator
to
40
db.
d.
sei
the
Model 46rA
GAIN (DB)
contror
b
40
db.
e.
Adjust the oscillaior AMPllTttDE control
lor
r
-10-
0
db
indicalion
on
the ac
voltmeter.
f.
Disconnect
theac vottmeterlrom posiiion A
and
connect
it
to position
B.
g.
The
ac
voltmeter
readlng should
be-10
db
+0.
5
h.
Rotate 461A GAIN
control to
20 db.
i.
The ac
voltmet€r
should
drop to -30
db
*1
db.
5.9.
OUTPUT VOLTAGE CIIECK
(46IA).
a.
Connect
the
461A
as
shown
in Figure 5-1,
b.
Set
the
osciUator
frequency
to
500
KHz
and set
its
output
to
minimum.
Set the attenuator
to
50 db.
c.
Connect the
ac
voltmeter
to
position
A.
d.
Adjust
the
osciUator
amplitude
for
a
voltmete!
readiq
oI -43.8
db.
e.
Set
the 461A GAIN
(DB)
switch to
40
db,
and
comect
the
voltmeter
to
position
B.
l.
The
voltmeter shouldread-3.8
db
+1
db, indi-
caiing
40 db
+1 db
of
gain
and 0.
5
*0-
05
volt
output.
5-
10.
!t!r9B!9ryrE9g_11!I4).
a.
Connect
the
461A
as
sholrn
iD
Figlre
5-2-
b.
set
the
oscillator
frequency
to
500
KHz
and
am-
plitude to minimum.
c.
Connect
the distortion aralyzer to vottmetel
fuction
and
comect
it
to A.
d.
set
the attenuaior
to
40 db and set
the
461A
GAIN (DB) to
40
DB.
e.
Adjust
ihe
osc
illator
for
an
jrdication
of
0.
5
volts
on
the
distortion analyzer.
Tabl€
5-1.
Test
Equipment Required (Cont'd)
ll'ype
Critical
Specrlications
50
O
I'eedthru
Resistancer
50
ohms
TYpe:
BNC
Per{ormance
Check
-hp-
110484
50
O
Feed-
thlu
Termination
Freq. Range:
l
KHz
-
200
MHz
RF
Variation across load:
+0.10
db
Frequency
Response
Calibration
Telonic
sM-2000
Sveep/
Signal G€nerator
Ireq.
Range:
l
KItz to
150
MEz
Flequency
Response
Telonic SPl-?1
BNc
"T"
Adapter
IJG.274A/IJ
cain
Check
-hp-
Part No.
1250-00?2
Type
"N"
uc-34gA/U
Itequency
Response
-hp- Part No.
1250-00??
Type
"NtLto-
BNC
Adapter
uG-207A/A
I'requency
Response
-hp- Part No.
1250-006?
Mate
BNC-to-
BNC
Adapter
uG-49lA/U
I'requency
Response
-hp- Part No.
1250-0216
/A
01358-2
5-1
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