Model 333A/334A
Section
V
SECTION
V
MAINTENANCE
5-1.
I
NTR ODUCTI
0
N.
5-2. This section contains maintenance and service
information for the 333A and 334A Distortion
Analy-
zers. Included are Performance Checks, Adjustment
and Calibration
Procedures,
and Troubleshooting
Techniques.
5-3.
REQUIRED
TEST
EQUIPMENT.
5-4. The
e
uipment needed to properly maintain the
Model 333A7334A
is
listed in Table 5-1.
If
the re-
commended model
is
not
available, any instrument
that has specifications equal to
or
better than the
re-
quired specifications may
be
used.
5-5.
PERFORMANCE CHECKS.
5-6.
The performance checks
are
in-cabinet proce-
dures that can
be
used to verify instrument perform-
ance. These procedures can
be
used for periodic
maintenance, to check specifications after a repair,
or
for
incoming quality control inspection. Perform-
ance checks
for
both the 333A and 334A are provided.
The performance checks
are
applicable toboth instru-
ments except where noted
in
paragraph heading.
5-7. The performance checks are made with the ac
power cord connected to nominal line voltage
(lOOv/
120V/ 220V/ 240V, 48 to
66
Hz),
MODE
SWPTCH
to
MANUAL,
HIGH
PASS FILTER to
OUT,
and
NORM.
-
R
F. DET. switch to
NORM,
unless otherwise
specified.
5-8.
A
Performance Check Test Card
is
provided
at
the end of this section for recording the performance
of
the instrument
during
the performance checks. The
card may
be
removed from the manual and used
as
a
permanent record
of
the incoming inspection
or
of
a
routine performance check.
If
the instrument
fails
to meet any
of
its
specifications, perform theAdjuat-
ment and Calibration Procedures, Paragraph 5-23.
5-9.
VOLTMETER ACCURACY
AND
FREQUENCY
RESPONSE CHECK.
a.
b.
C.
d.
e.
f.
g.
Conned voltmeter calibrator to 333A/334A
as
shown
in
Figure 5-1. Test
oscillator
will
be
used later
in
check.
METER.
Set
voltmeter calibrator for 400 Hz rms
output.
Check 333A/334A voltmeter
full
scale read-
ing
on
all ranges
against
appropriate
rms
input
from
voltmeter calibrator. Voltmeter
accuracy should be within
&2%.
Disconnect voltmeter calibrator.
Set 333A/334A FUNCTION Switch to VOLT-
Connect
5052
output
of
test oscillator, term-
inated in 5052,
to
333A/334A.
Set 333A/334A METER RANGE switch
to 3
VOLTS.
VOLTMETER CALIBRATOR
hp
738BR DISTORTION ANALYZER
hp
333A/334A
c.
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tt
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0
(9
'
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006
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TEST OSCILLATOR
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hp
6521
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-
son
FEED-THRU
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TERMINATION
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------------
SSA-B-1468
9-8
fiL
Figure 5-1.
Voltmeter
Accuracy and Frequency Response Check
5-1
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