TM 11-6625-2781-14&P-2
ERRATA
4-12. FRONT PANEL CHECK PROCEDURE
4-13. Preset Adjustments
CAUTION
Before placing the system in operation, ensure that the operating voltage indicated in the power
module window agrees with the line voltage being used.
4-14. With the proper operating voltage indicated in the power module window and the ac power cord installed, perform
the following steps:
a.
Set INTENSITY fully CCW.
b.
Depress STD. pushbutton and set PERSISTENCE fully CCW.
c.
Turn LINE switch ON. The CRT screen should illuminate after a few seconds.
d.
While the instrument is warming up, set the controls as follows:
RANGE MHz .........................................................................................................................................................0 - 110
FREQUENCY FINE TUNE ............................................................................................... Mid-range (5 turns from stop)
BANDWIDTH ......................................................................................................................................................300 kHz
SCAN WIDTH ................................................................................................................................................ 0-100 MHz
SCAN WIDTH PER DIVISION...............................................................................................................................5 MHz
INPUT ATTENUATION.......................................................................................................................................... 20 dB
TUNING STABILIZER ................................................................................................................................................ On
BASELINE CLIPPER ......................................................................................................................................Fully CCW
SCAN TIME PER DIVISION .............................................................................................................. 5 MILLISECONDS
LOG REF LEVEL .............................................................................................................................................. - 10 dBm
LOG REF LEVEL Vernier ...............................................................................................................................Fully CCW
LOG/LINEAR (8552A).............................................................................................................................................. LOG
2 dB LOG - 10 dB LOG - LINEAR (8552B).................................................................................................... 10 dB LOG
VIDEO FILTER .....................................................................................................................................................10 kHz
SCAN MODE ............................................................................................................................................................. INT
SCAN TRIGGER.................................................................................................................................................... AUTO
e.
Turn FOCUS to approximately 1 o'clock.
f.
Turn INTENSITY clockwise until baseline trace appears on CRT screen.
g.
Tune FREQUENCY to 0. Set SCAN WIDTH to PER DIVISION. (The UNCAL light will go out.)
The LO feedthrough signal should appear near the center of the screen.
h.
Adjust FOCUS and INTENSITY for a sharp trace.
Connect CAL OUTPUT to RF INPUT using a BNC-to-BNC cable. Set FREQUENCY to 45 MHz.
4-15. Display Section Adjustments
Set IF section LOG REF LEVEL fully CCW and SCAN TIME PER DIVISION to 10 SECONDS.
b.
Adjust display section FOCUS and ASTIG for the smallest round dot possible.
B-27
