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Adjustment Procedures
5-32
2715 Spectrum Analyzer Service Manual
b. Connect a 100 MHz/--30 dBm signal to the RF INPUT.
c. Recall default amplitude normalizations by pressing UTIL5529Y.
Press any menu button to exit the menu.
d. Select the following settings on the Spectrum Analyzer:
FREQUENCY 100 MHz
REFERENCE LEVEL --20 dBm
SPAN/DIV 10 kHz
RESOLUTION BW 10 kHz
VIDEO FILTER Off
VERTICAL SCALE 10 dB/Div
e. Adjust C361, C325, C252, C234, and C210 on the RF Options board
(Figure 5--8 on page 5--28) for highest amplitude and best filter shape.
f. Set the reference level for a full screen display, and enable the VID
FLTR.
g. Enable bandwidth mode by pressing APPL 9 0 and entering --6 dB, then
pressing BKSP 0.
h. Check bandwidth shape factor. The bandwidth at the 60 dB down point
must not exceed 7X the bandwidth at the 6 dB down point.
i. Check that the filter amplitude is --20 dBm, ±4dB.
j. Disconnect the signal from the R F INPUT.
7. Adjust 300 Hz Resolution Bandwidth Filter (C413, C425, C450, and C451
on the RF Options board) as follows:
a. Recall factory default power up settings by pressing UTIL 1 1.
b. Disconnect W47 from J180 on the RF Options assembly (at the front
connector on the RF Options assembly) and connect a 10.00000 MHz,
--15 dBm signal to J180.
c. Select the following settings on the Spectrum Analyzer:
FREQUENCY 100 MHz
REF LEVEL --30 dBm
SPAN/DIV 1 kHz
RES BW AUTO
VID FLTR Off
VERT SCALE 1 0 dB /Div
d. Press SWEEP ↑ twice. The display should be a straight line.
e. Adjust C413, C425, C450, and C451 on the RF Options board (Figure 5--8)
for maximum amplitude.