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Adjustment Procedures
5-40
2715 Spectrum Analyzer Service Manual
Use the following procedure to adjust R640 and R740 on the Sweep board.
H Test equipment required:
TV V isual Carrier Source
Oscilloscope with Probes
Multimeter (DMM)
1. Press UTIL 0 to initialize instrument settings. Set SPAN/DIV to 2 MHz and
RESOLUTION BW to 5 MHz.
2. Connect an RF visual carrier (such as from a TV antenna) to the RF INPUT.
3. Tune the Spectrum Analyzer to a TV visual carrier via UTIL 2 0. See Table
5--5 for visual carrier frequencies.
Table 5- 5: Television Channels
Channel Video Carrier
2 55.25 MHz
3 61.25 MHz
4 67.25 MHz
5 77.25 MHz
6 83.25 MHz
7 175.25 MHz
8 181.25 MHz
9 187.25 MHz
10 193.25 MHz
11 199.25 MHz
12 205.25 MHz
13 211.25 MHz
NOTE. The aural carrier is 4.5 MHz away from the visual carrier. Carrier
frequencies for Channels A through W and 14 through 83 are omitted from
this table.
4. Set video signal parameters by pressing DEMOD 9 and selecting BROAD-
CAST VIDEO DETEC T MODE, POSITIVE SYNC POLARITY, and
NEGATIVE VIDEO POLARITY. Press any menu button to exit the menu.
5. Set the peak carrier level at the top graticule line (REF LEVEL ↑ or ↓).
6. Enable the broadcast (AM) video mode by pressing DE MOD 3, and set the
LEVEL control for minimum flicker in the displayed picture.
Video Monitor Adjustment