Wavetek 3000 Instruction Manual page 73

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 slide cover
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 made with reference to
chassis ground .
5 .3 .1 +18 Volt Adjustment
Connect digital voltmeter to orange +18
volt line on pin 3 of module M30 and set
+18 V 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 Supply board
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 Volt Check
RECOMMENDED
Keithley 179
MAINTENANCE
5 .3 .2
-18 Volt Adjustment -
Connect digital voltmeter to yellow -18
volt line on pin 4 of module M30 and set
-18 V ADJ on power supply for -18 .00 h .
Connect digital voltmeter to green +7 .3
volt line on pin 2 of module M30 . The
reading must be +7 .3 V ±100 mV .
5 .3 .4
Crystal-Frequency Adjustment
Module M30
Connect frequency 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/cm sensitivity
High frequency - at least
10 MHz
Power Meter
10-520 MHz Frequency Range
HP Model 435A with
-10 dBm to +15 dBm Power Range Model 8481A Power
Sensor
Frequency Counter
HP Model 5303B
Spectrum Analyzer
HP Model 8558B