Adjustment Procedures
5-40 2715 Spectrum Analyzer Service Manual
Use the following procedureto adjust R640 and R740 on the Sweep board.
HTest equipmentrequired:
TV Visual Carrier Source
Oscilloscope with Probes
Multimeter (DMM)
1. Press UTIL 0 to initialize instrumentsettings. S etS PAN/DIVto 2 MHz and
RESOLUTION BW to 5 MHz.
2. Connect an RF visual carrier (such as from a TV ant enna) to the RF INPUT.
3. Tune the Spectrum Analyzerto a TV visual carrier via UTIL 2 0. See Table
5--5 for visual carrier frequencies .
Table5 -5: Television Channels
Channel Video Carrier
255.25 MHz
361.25 MHz
467.25 MHz
577.25 MHz
683.25 MHz
7175.25 MHz
8181.25 MHz
9187.25 MHz
10 193.25M Hz
11 199.25 MHz
12 205.25M Hz
13 211.25MHz
NOTE. The aural carrier is 4.5 MHz away from the visualcarrier. Carrier
frequenciesfor C hannelsA through W and 14 through 83 are omitted from
this table.
4. Set video signal parameters by pressi ng DEMOD 9 andselecting BROAD-
CAST VIDEO DETECT MODE, POSITIVE SYNC POLARITY, and
NEGATIVEVIDEO POLARITY. Press any menu button to exit the menu.
5. Set the peak carrier level at the top graticuleline (REF LEVEL ↑or ↓).
6. Enable the broadcast (AM) video mode by pressin g DEMOD 3, and set the
LEVEL control for minimum flicker in the displayed picture.
Video Monitor Adjustment