Wavetek 3000 - Meter Board Calibration C315; Final Frequency Check - M30; FM Reference Adjustment - M29-1

MAINTENANCE
Connectdigital voltmeter
to

chassis
MOD T .P .

Set FREQ switch to VERNIER and
AM/FM Verniercontrol to maximum .

Refer
to Figure 5-6 for control location and
adjust modulation board pot . (A) for a
+5
.00 Vreading on voltmeter .

Set AM/FM
Vernier to
0% AM ; the voltmeter should
indicate 0
V ±20 mV .
5 .3 .10 Meter Board
Calibration
-
C315
To adjust OUTPUTmeter, the unit must
rest on its bottom surface (normal op-
erating position) . Momentarily turn OFF
power to instrument and mechanically
zero OUTPUT meter with front-panel zero
adjust screw . The meter needle should
bisect dot at left end of meter scale .
Restore power to instrument and allow it
to
stabilize .
Set
front panel VERNIER fully ccw ; then,
adjust Meter
Board pot . (B) untilmeter
needle again bisects dot
at left end of
meter scale .

See Figure 5-6
for location
of Meter Board pots .

Set VERNIER com-
pletely cw and adjust Meter
Board pot .
(A) for a +3 dBm OUTPUTmeter
reading .
Set front panel
controls as follows :
FREQUENCY switches to 50.000
MHz, MODE
to CW, VERNIER completely cw
and OUTPUT
dial to +10 dBm . Calibrate power
meter
and its
thermistor or power sensor . Set
powermeter to
the +15 dBmrange ; then
connect
thermistor or sensor to RF OUT
connector of
Model
3000
.
Adjust Meter
Board pot . (F) for a +13
dBm power meter
reading . Set front
panel VERNIER for -7 dBmreading on
OUT-
PUTmeter and set power
meter to the +5
dBm range . Adjust Meter
Board pot
.
(E)
for +3 dBm powermeter reading .

Again
set
power meter to the +15 dBm range and
turn front panel VERNIER fully cw . Re-
peat this paragraphuntil+13 dBm and
+3
dBm powermeter readingsare obtained
without further adjustment of MeterBoard
pots
.
(E) and (F) .
5-6
Set OUTPUT dial to 0 dBm and powermeter
to the +5 dBm range .
With VERNIER com-
pletely cw, adjust Meter
Board pot . (C)
for a +3
dBm power meterreading . Turn
VERNIER
for
-6
dBm reading on OUTPUT
meter and set powermeter to
the -5 dBm
range . AdjustMeter
Board pot . (D) for
-6 dBm powermeter
reading . Repeat this
paragraph until +3 dBm and -6 dBm power
meter readings are obtained without
fur-
ther
adjustment of Meter Board pots . (C)
and (D)
.
Set
Model 3000 front panel controls as
follows :
FREQUENCY switches to 520 .000
MHz, MODE to
AM, FREQ
to
VERNIER, AM/FM
Vernier
control to OI AM and OUTPUT dial
to 0
dBm . Set power meter to the 0 dBm
range and adjust
front panel VERNIER
for a -3 dBm reading on power
meter .
Set power meter to the +5
dBm range and
adjust AM/FMVernier to 1001
AM .
Adjust
Meter Board pot . (G) for +3 dBm reading
on power meter .
5 .3.11 Final FrequencyCheck - M30
Connect frequencycounter to signal gen-
erator and set front panel controls as
specified in Section 5 .3 .4 . Note fre-
quency reading on counter ; if it does
not agree with the selected FREQUENCY
within
accuracy specifications,

very
carefully adjust M30 FREQUENCYADJUST
trimmer (See
Figure
5-5)
until desired
frequency is obtained .
5.3 .12 FM Reference
Adjustment - M29-1
See Figure 5-6 for location of
M29-1 ad-
justments . Connect frequency
counter to
frontpanel RF OUT connector
; then set
other
front panel controls as follows :
FREQUENCY to 40.000 MHz,

MODE to
CW,
FREQ
to VERNIER, AM/FMVernier
at mini-
mum, VERNIER fully cw and
OUTPUT dial
at
+10dBm .

Record the CW frequency
shown on
frequencycounter .
1(P/
V ~~

Clkt~1