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Adjustment Procedures
5-30
2715 Spectrum Analyzer Service Manual
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 100 kHz
RESOLUTION BW 30 kHz
VIDEO FILTER Off
VERTICAL SCALE 10dB/Div
e. Save the display in one of the DISPLAY STORAGE registers.
f. Adjust C270, C260, C233, and C120 on the RF Options board (Figure 5--8)
for highest amplitude, best filter shape, and centering about the stored
30 kHz filter.
g. Set the reference level for a full screen display, and enable the VID FLTR.
h. Enable bandwidth mode by pressing APPL 9 0 and entering --6 dB, then
pressing BKSP 0.
i. Check bandwidth shape factor. The bandwidth at the 60 dB down point
must not exceed 7X the bandwidth at the 6 dB down point.
j. Check that the filter amplitude is --20 dBm, ±4dB.
k. Disconnect the signal from the R F INPUT.
4. Adjust 30 kHz Resolution Bandwidth Filter (C314 and C430 on the VR board)
as follows:
a. Recall factory default power up settings by pressing UTIL 1 1.
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
REF LEVEL --20 dBm
SPAN/DIV 10 kHz
RES BW 30 kHz
VID FLTR Off
VERT SCALE 10 dB /Div
e. Adjust C314 and C430 on the VR board (Figure 5--9 on page 5--29) for
highest amplitude and best filter shape.