TB 9-4931-491-35
(4) Set SWEEP TIME SEC to LINE.
(5) Adjust M1H CLAMP to extend the sweep 0.2 cm beyond the first graticule line (R).
10. Dial Accuracy
a. Performance Check
(1) Repeat 7 c (1) through (8) above.
(2) Set SWEEP WIDTH between 1 and 2 MHz.
(3) Adjust CENT FREQ control until the zero frequency lock-in point is exactly
centered on oscilloscope No. 2 display.
(4) Read the error on the frequency scale.
(5) Repeat (1) through (4) above at each 50 MHz interval across the band. The
allowable error is 10 MHz.
(6) Position controls as listed in (a) through (d) below:
(a)
MODE switch to S/S.
(b)
BAND switch to 1.
(c)
CENT FREQ control to 10 MHz.
(d)
SWEEP WIDTH control to 510 MHz.
(7) A pattern similar to figure 2 should be present on oscilloscope.
(8) Reduce SWEEP WIDTH control until the 500 MHz marker just disappears from
the right side of the oscilloscope display.
(9) Read the error on the STOP frequency indication (red).
(10) Repeat (6) through (9) above at each 50 MHz interval. Allowable error is 10 MHz.
(11) Set TI MODE switch to CW and OUTPUT switch to 0 dBm.
(12) Remove the crystal detector from RF OUT jack.
(13) Connect RF OUT to measuring receiver and press measuring receiver FREQ button.
(14) Adjust CENT FREQ control to 50 MHz.
(15) Observe measuring receiver frequency reading. Allowable error is 10 MHz.
(16) Repeat technique of (14) and (15) above at each 50 MHz interval across the
band. The allowable error is 10 MHz.
b. Adjustments. No adjustments can be made.
11. RF Output Level and Vernier Accuracy
a. Performance Check
(1) Position controls as listed in (a) through (h) below:
(a)
BAND switch to 1.
SWEEP TIME SEC switch to LINE.
(b)
(c)
OUTPUT switch to +10 dBm.
MARKERS WIDTH SIZE switch to WIDE.
(d)
