TB 9-6625-1914-24
NOTE
It may be necessary to retune the fine tune frequency control to
midrange.
(9) Position RF plug-in controls as listed in (a) through (d) below:
(a) BANDWIDTH switch to 10 kHz.
(b) SCAN WIDTH PER DIVISION switch to 0.2 MHz.
(c) TUNING STABILIZER switch to ON (up).
(d) Set SCAN TIME PER DIVISION switch to 2 ms.
(10) Position RF plug-in controls as listed in (a) through (d) below:
(a) FREQUENCY FINE TUNE control adjusted until signal is centered on display.
(b) SCAN WIDTH PER DIVISION switch to 20 kHz.
(c) SCAN WIDTH (red) switch to 0.
(d) Set VIDEO FILTER switch to 10 kHz (Model 8552B only).
(11) Adjust RF plug-in FREQUENCY FINE TUNE control for best signal display.
(12) Adjust LINEAR SENSITIVITY (LOG REF LEVEL vernier) vernier control for a
7.1 division signal amplitude on display.
(13) Decrease signal generator frequency slowly until display amplitude reduces to 5.0
divisions. Note signal generator frequency.
(14) Increase signal generator frequency until display amplitude peaks and again
reduces to 5.0 divisions. Note signal generator frequency and compare with frequency
noted in (13) above. Frequency difference will be between 9.5 and 10.5 kHz.
b. Adjustments. No adjustments can be made.
11. Amplitude Display Accuracy
a. Performance Check
(1) Position RF plug-in controls as listed in (a) through (g) below:
(a) RANGE MHz switch to 0-110 (Model 8553B only).
(b) FREQUENCY control to 30 MHz.
(c) FREQUENCY FINE TUNE control to midrange.
(d) BANDWIDTH switch to 100 kHz.
(e) SCAN WIDTH (red) switch to PER DIVISION.