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Adjustment Procedures
2715 Spectrum Analyzer Service Manual
5-29
d. Select the following settings on the spectrum analyzer:
FREQUENCY 100 MHz
REF LEVEL --20 dBm
SPAN/DIV 200 kHz
RES BW 30 kHz
VID FLTR Off
VERT SCALE 10 dB /Div
e. Save the display in one of the DISPLAY STORAGE registers.
f. Reset the RES BW to 300 kHz.
g. Adjust C611, C612, C620, and C621 on the VR Filter Select board
(Figure5--9) for highest amplitude, best filter shape, and centering.
Variable Resolution Module
3 kHz Filter
30 kHz Filter
300 kHz Filter
C211
C220
C230
C314 C430
C611 C612 C620 C621
Figure 5- 9: Variable Resolution Module Adjustment Locations
h. Set the reference level for a full screen display, and enable the VID
FLTR.
i. Enable bandwidth mode by pressing APPL 9 0 and entering --6 dB, then
pressing BKSP 0.
j. Check bandwidth shape factor. The bandwidth at the 60 dB down point
must not exceed 7X the bandwidth at the 6 dB down point.
k. Check that the filter amplitude is --20 dBm, ±4dB.
l. Disconnect the signal from the RF INPUT.
3. Adjust 100 kHz Resolution Bandwidth (C270, C260, C233, and C120 on
the RF Options 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.