Maintenance - Wavetek 130 Instruction Manual

SECTION
4
MAINTENANCE
INTRODUCTION
This section provides instructions for
testing, calibra-
ting,
troubleshooting, and
repairing
the Model
130.
The
instructions are concise and for the experienced
electronics technician or field engineer.
Wavetek
main-
tains a factory-repair
department
for those customers
not possessing the necessary personnel or
test
equip-
ment
to
maintain the
instrument.
If
an instrument
is
returned
to
the factory
for calibration
or
repair, a
detailed description of the specific
problem
should be
attached
to facilitate
the turnaround time. Test point
and adjustment
locations are illustrated
in
the
Data Package.
RECOMMENDED
TEST
EQUIPMENT
Table 4-1 contains
a
list
of
recommended
test
equip-
ment.
Any
test
equipment
having equivalent accuracies
may
be substituted
for
those
listed.
Table
4-1.
TEST EQUIPMENT
Name
Required
Characteristics
Recommended
Manufacturer Model
Oscilloscope
To
30
MHz
Tektronix
544
Plug-In Dual Channel Tektronix 1A1
Plug-In
Peak
mV
measuring
capability
Tektronix
1A5
Distortion
Analyzer
To 600 kHz
Hewlett-Packard
334A
Spectrum
Analyzer
Display
To
50
MHz
Hewlett-Packard 141S
IF Section Hewlett-Packard
8552A
RF
Section Hewlett-Packard
8553L
Voltmeter
M
illivolt
dc
measurement
.01
Accuracy
Counter
to
10
MHz
0.1%
of reading accuracy
CHECKOUT
AND
CALIBRATION
The
following paragraphs provide
complete
sequential
calibration
procedures
for the
Model
130.
instrument
checkout procedures
are indicated
by
a
checkmark
(
v/
)
following the procedure
title.
A
quick checkout
of the instrument can be performed by comparing
the
indicated parameters with the
tolerances given
in
the
Specifications of Section
1.
NOTE
The
entire calibration
procedure
must
be
read
first
to
determine
initial
control
settings
and
test
equipment
connections
before attempting checkout.
Preliminary Procedures
1.
Set
FREQ HZ
selector to the
XI
K
position.
2.
Allow
one-half
hour
for
warmup.
Removal
of Dust Cover
To
gain access for calibration or
maintenance, proceed
as follows:
a.
Remove
power
cord.
b.
Loosen
the
two
knurled captive screws
on
the
rear
panel.
c.
Pull off the rear panel.
d.
Remove
the cover.
Power Supply
Regulation
1.
Connect voltmeter between TP1
(common)
and
TP2(-t)
on Main
Board. Adjust
R104
for
-H5
Vdc
±100 mV.
2.
Connect voltmeter between TP1 (common)
and
TP3(—
).
Since the
negative
supply
is
referenced to
the -H5-volt supply, the
voltmeter should indicate
-15 Vdc ±100 mV.
Square
Wave
Amplitude
Symmetry
1.
Set function selector to
Tj
.
2.
Connect
oscilloscope,
with 1A5
plug-in, to coaxiai-
wire
lug
on
function
switch.
3.
Adjust R121
until square-wave negative peak
is
equal
to
amplitude
to positive
peak ±5
mV.
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