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3.
Remove
bulb
from
the indicator
lamp, and
remove
four
front panel retaining screws.
4. Pull
the
front panel
straight
forward
to
remove
it.
4.2
CALIBRATION INSTRUCTIONS
This paragraph provides
complete
sequential
calibration
instructions
for
this
instrument.
The
instructions
are
concise
and
are written
for the
experienced
electronics
technician or
field
engineer having
a
working knowledge
of
this
type
of instrumentation.
WAVETEK
maintains
a
factory
repair
department
for
those
customers not
possessing the necessary
test
equipment
or
personnel
to
maintain
this
type
of instrument.
If
an
instru-
ment
is
returned to the factory
for calibration or
repair, a
detailed
description
of the
specific
problem
should be
attached.
This
will
hasten
turnaround
time.
4.2.1
Recommended
Test
Equipment
The
following
test
equipment
(or
equivalent)
is
recom-
mended
for
this
calibration
procedure.
A
quick checkout
of the instrument can be
made
by comparing
the
indicated
parameters with those
given
in
the
specifications
portion of
Section
1.
Table
4-1.
TEST
EQUIPMENT
Required
Recommended
Name
Characteristics
Manufacturer
Model
Oscilloscope
To
250
MHz
Tektronix
454
Oscilloscope
To
30
MHz
Tektronix
544
Plug-1
n
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
H
ewIett-Packard
8553L
Differential
Microvolt
dc
Voltmeter
measurement
Counter
To
10
MHz
0.1%
of reading
accuracy
NOTE
The
entire calibration
procedure
must
be
read
first
to
determine
initial
control
settings
and
test
equipment
connections required before
attempting
recalibration.
The
steps
of
this
pro-
cedure should
be performed
in
the
sequence
given,
and
the parts within
each
step
should
also
be performed
in
the
same
sequence
given.
4.2.2
Preliminary Procedures
1.
Set the front panel controls to the positions
listed:
FREQ
Hz
X
100
FREQ
DIAL
10
WAVEFORM
SELECTOR
Sine
30
V
P-P
MAX
3/4ths of
full
CW
DC OFFSET
(in
rear
panel)
OFF
SYMMETRY
(in
rear panel)
OFF
OUTPUT ATTEN
-10
dB
VERNIER
full
CW
MODE
CONT
SWEEP
TIME
OFF
SWEEP WIDTH
CCW
4.2.3
Power
Supply
Regulation
2.
Following
the instructions
in
paragraph
4.1.2,
attach
the
Power
Supply Board
to
the
rear
plate of
the
instrument.
3.
Connect
ac
power
to the instrument,
and connect
the
voltmeter
leads to
TP1 (common)
and
TP2
(+15 V)
on
the
Power Supply
Board. See Figure 4-5
4.
Adjust
R21
for
a
reading of
-t15
Vdc ±20
mV
on
the
voltmeter.
5.
Check
the voltage
at
TP3
for
—15 Vdc ±50 mV;
at
TP4
for
+28
Vdc ±400
mV;
and
at
TPS
for
-28
Vdc
±400
mV.
6.
Replace
the
board and
the
dust
cover,
and
allow the
generator
to
warm
up
for at
least
1/2
hour
before
calibration.
4.2.4
VCG
Amplifier
—
Zero
Offset
Adjustment
7.
Connect
a
5.1
kf2
resistor
to
each
test
lead
of the
differential
voltmeter
for
isolation
to
prevent
integrated
circuit oscillations.
8.
Set
FREQ
HZ
to
X
100,
FREQ
DIAL
to
full
clockwise
extreme,
FREQ VERNIER
to
CAL,
and
SYMMETRY
to
OFF.
4-2
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