(c) FUNCTION START-STOP pushbut-
ton pressed.
a. Performance Check,
(d) All AMPLITUDE MOD pushbuttons
(1) Position sweep oscillator controls as fol-
released.
lows:
(2) Position UUT controls as follows:
(a) FUNCTION
F pushbutton pressed.
(a) SCALE switch to X.1.
(b) All AMPLITUDE MOD pushbuttons
(b) POWER LEVEL control to +10
released.
DBM.
(c) SWEEP SELECTOR switch to CW
(c) VERNIER control to CAL.
(d) STOP/ F to 10 on F scale.
(3) Adjust sweep oscillator START/CW
(2) Position UUT controls as follows:
control for 5.000 MHz on electronic counter.
(a) SCALE switch to X1.
(4) Adjust autotransformer output voltage
(b) POWER LEVEL switch to +10DBM.
control for a meter indication of 105, 125, and
(c) VERNIER control to fully clockwise
115 vac.
(CAL on PL-1241A,USM-308(V).)
(5) Electronic counter indicates between
(3) Adjust sweep oscillator START/CW con-
4.995 and 5.005 MHz at each setting,
trol for 5.000 MHz on electronic counter.
(6) Set UUT SCALE switch to X1.
(4) Set sweep oscillator SWEEP SELEC-
(7) Adjust sweep oscillator START/CW
TOR switch to MANUAL.
control for 50.00 MHz on electronic counter.
( 5 ) Turn sweep oscillator. MANUAL
(8) Adjust autotransformer output volt-
SWEEP control as listed in table 6-3. Electronic
age control for a meter indication of 105, 125,
counter indicates within specified limits,
and 115 vac.
(6)' Repeat step (1) above.
(9) Electronic counter indicates between
(7) Set UUT SCALE switch to X1,
49.95 and 50.05 MHz at each setting.
(8) Adjust sweep oscillator START/CW
(10) Disconnect equipment.
control for 50.00 MHz on electronic counter.
b. Adjustments. No adjustments can be made.
(9) Repeat step (4) above.
( 1 0 ) Turn sweep oscillator MANUAL
6-6. Linearity
SWEEP control as listed in table 6-4. Electronic
a. Performance Check.
counter indicates within specified limits.
(1) Connect equipment as shown in figure
(2) Position sweep oscillator controls as fol-
lows:
Fully counterclockwise . . . . . . . . . . . . . . . 4.47 to 4.63
Fully clockwise . . . . . . . . . . . . . . . . . . . . . . . . 5.47 to 5.53
Table 6-4. AF Accuracy (X.1)
Sweep oscillator
MANUAL SWEEP
Electronic counter
indication (MHz)
Fully counterclockwise . . . . . . . . . . . . . . 44.7 to 45.3
Fully clockwise . . . . . . . . . . . . . . . . . . . . . . . . 64.7 to 55.3
b. Adjustments. No adjustments can be made.
a. Performance Check.
(1) Position sweep oscillator controls as fol-
lows:
(a) SWEEP SELECTOR switch to CW.
(b) START/CW control to 50.
35
