TB 9-6625-1914-24
(a) BANDWIDTH to 300 Hz.
(b) SCAN TIME PER DIVISION to 0.1 SEC.
(c) SCAN WIDTH PER DIVISION to 5 kHz.
(6) A d j u s t F R E Q U E N C Y a n d F I N E T U N E c o n t r o l s t o c e n t e r a m a r k e r o n
- 4 GRATICULE LINE.
(7) Repeat (3) above.
b. Adjustments. No adjustments can be made.
46. Center Frequency Accuracy
a. Performance Check
(1) Position TI controls as listed in (a) through (i) below:
(a) RANGE switch to 0-300 kHz.
(b) FREQUENCY control to 20 kHz.
(c) FINE TUNE control centered.
(d) BANDWIDTH switch to 300 Hz.
(e) SCAN WIDTH switch to PER DIVISION.
(f) PER DIVISION switch to 1 kHz.
(g) INPUT LEVEL switch -20 dBm/dBV.
(h) dBm/dBV switch to dBV.
(i) 20 kHz MARKERS switch depressed.
(2) Position IF plug-in controls as listed in (a) through (g) below:
(a) SCAN TIME PER DIVISION switch to 50 ms.
(b) LOG REF LEVEL switch to -10 dBV.
(c) LOG/LINEAR switch to 10 dB LOG.
(d) VIDEO FILTER switch to OFF.
(e) SCAN MODE switch to INT.
(f) SCAN TRIGGER switch to AUTO.
(g) BASE LINE CLIPPER control fully ccw.
(3) Adjust FREQUENCY control to center dial marker on CENTER FREQUENCY
dial every 20 kHz from 20 to 300 kHz. At each 20 kHz point, a 20 kHz marker should