TB 9-6625-1914-35
(b) LOG REF LEVEL to -40 dBm.
(c) VIDEO FILTER to OFF.
(d) SCAN MODE to INT.
(e) SCAN TRIGGER to AUTO.
on display.
(5) Set SCAN TIME/DIV to 50 ms, and adjust function/arbitrary generator
frequency to place a signal pip at a point 50 kHz below signal generator pip
(approximately 9.95 MHz).
(6) Adjust amplitude controls of signal generator and function/arbitrary generator
until both signal amplitude displays peak 3 dB below the LOG REF graticule line (-43 dBm).
(7) Adjust FREQUENCY control to observe display at 19.95, 10.05, 9.9, 29.95, and
29.9 MHz. Spurious response appearing on display at the above points will not be larger
than -110 dBm LOG REF line (-70 dB down from -40 dB LOG REF graticule line).
b. Adjustments. No adjustments can be made.
22. Local
Oscillator Stability
a. Performance Check
(1) Position TI controls as listed in (a) through (f) below:
(a) FREQUENCY control to 0 MHz (local oscillator feed-through).
(c) SCAN WIDTH (red) switch to PER DIVISION.
(d) SCAN WIDTH PER DIVISION switch to 0.2 kHz.
(f) TUNING STABILIZER switch to ON (up).
(2) Position IF plug-in controls as listed in (a) through (f) below:
(a) SCAN TIME PER DIVISION switch to 50 ms.
(b) LOG-LINEAR switch to LINEAR.
(c) LINEAR SENSITIVITY (LOG REF LEVEL) switch and vernier controls
for a full 8 division vertical display of local oscillator feed-through signal.
(d)
VIDEO FILTER switch to OFF.
(d) SCAN MODE switch to INT.
(e) SCAN TRIGGER switch to AUTO.