Maintenance; Recommended Test Equipment - Wavetek 132 Instruction Manual

SECTION 4
MAINTENANCE
INTRODUCTION
This
section provides instructions for testing, calihrat-
ing,
troubleshooting,
and
repairing the
Model
132.
The
instructions are concise
and
for
the experienced
elec-
tronics 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 turn
around
time.
Test point
and adjustment
locations are illustrated
in
Section
5.
(
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
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
Oscilloscope
Plug-in
Plug-in
Distortion
Anaiyzer
Spectrum Analyzer
Display
I
F Section
RF
Section
Voltmeter
To 30
MHz
Dual Channel
Peak
mV
measuring
capability
To
600 kHz
To 50
MHz
Millivolt
dc
measurement
(10 millivolt resolution)
1.
Set
FREQ HZ
selector to
XI
K position.
2.
Depress
MODE — FUNC
push button.
3.
Set
OUTPUT ATTEN
(dB) selector
to 0
position.
4.
Allow
one-half
hour
for
warm-up.
j?.
dc
crnc'r
(_X>c TE>Jt)
Power Supply
Regulation
1.
Connect voltmeter
between TP1 (common)
and
TP2
(+)
on main
board.
Adjust
R104
for
+ 15
Vdc ±100 mV.
2.
Connect
voltmeter
between
TP1 (common)
and
TP3
(—
).
Since the
negative
supply
is
referenced
to
the
+15
V
supply, the
voltmeter should
indicate
—15
Vdc ±100
mV.
3.
Connect voltmgtgr^etween +5
V
and
location
DG
on ^r^Jgfe
oard. Verify that voltage
is
+4.75
to
+5.25
volts.
Square
Wave Amplitude
Symmetry
1.
Set function
selector to
.
2.
Connect
oscilloscope,
with
peak
mV
plug-in, to
tab of switch
SW3B,
as illustrated
below.
Counter
To
10
MHz
Scope
Probe
XI
Attenuation
CHECKOUT AND
CALIBRATION
The following paragraphs provide
complete
sequential
calibration
procedures for the
Model
132.
Instrument
checkout procedures are indicated
by
a
check
mark
WAVEFORM
SELECTOR
13