Wavetek 3000 - Calibration Procedure; +18 Volt Adjustment; -18 Volt Adjustment; +7.3 Volt Check

CAUTION
The Power Supply board
may be
raised far enough to allow
checking
of many components
with the
harnesses sti11connected ; however,
power must NOT be applied to the
instrument unless the negative
INSTRUMENT
Digital
Voltmeter
5.3 CALIBRATION PROCEDURE
.04% Accuracy
Remove
the instrument top cover, the
bottom cover, and the
M172 module
cover .
The
M172 module can be
located
by reference
to Figure 5-6 ; then remove
screw
from top of module and slidecover
off .
Allow a two-hour warmup period
before calibrating .
In general,
calibration should be per-
formed in the sequence
given . Refer to
Figures 5-4, 5-5 and 5-6
for
test
point
and adjustment locations .
NOTE : All
measurements are madewith
reference to
chassis
ground .
5.3
.1 +18VoltAdjustment
Connectdigital
voltmeter to orange +18
volt line on pin 3 of module
M30 and set
+18V ADJ . on power supply to
produce
+18 .00 V .

(See Figures 5-5
and
5-6)
.
TABLE 5-1 . RECOMMENDED
TEST EQUIPMENT
CRITICAL
REQUIREMENT
The
Power Supplyboard is
reinstalled
by reversing
the removal procedure
.
(ground) side of
C10 is connected
to the instrument
chassis ground,
and to the
positive (ground) side
of C9 (jumper
wires are sufficient)
5 .3 .3
+7 .3 VoltCheck
RECOMMENDED
Keithley 179
MAINTENANCE
5 .3 .2 -18
Volt Adjustment -
Connect digital
voltmeter to
yellow -18
volt line on pin 4 of
moduleM30 and
set
-18V ADJ on power
supply for -18 .00 h .
Connect
digital voltmeter to green +7 .3
volt line on
pin 2 of module M30 . The
readingmust be +7 .3
V ±100 mV .
5.3.4 Crystal-Frequency
Adjustment
ModuleM30
Connectfrequency counter having 50
ohm
input to the
Model 3000 RF OUT connector .
Set the signal
generator FREQUENCY
switches
to a high frequency which is
within the counter's
range s such as
500 .000 MHz .

Set front panel controls
as follows :

MODE to CW,
FREQ
to
EXT,
AM/FM Vernier at minimum, OUTPUT
dial at
+10 dBm and VERNIER
Maximum
clockwise .
5-
3
Oscilloscope
DC and AC coupled
Tektronix 5400
At least 50 mV/cmsensitivity
Highfrequency - at least
10 MHz
Power Meter
10-520MHz FrequencyRange HP Model 435A
with
-10 dBm to
+15 dBm Power Range Model 8481A Power
Sensor
FrequencyCounter
HP Model 5303B
Spectrum Analyzer
HP
Model 8558B