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Adjustment Procedures
5-22
2715 Spectrum Analyzer Service Manual
d. Select the following settings on the Spectrum Analyzer:
FREQUENCY 100 MHz
SPAN/DIV ZERO SPAN
RES BW 3 kHz
VERT SCALE 1 dB/div
VIDEO FILTER ON
e. Disable DISPLAY STORAGE by pressing D, and press SWEEP ↓
twice.
f. Adjust R622 (LOG GAIN) on the Log board for trace shift as the VERT
SCALE is cycled through 10 dB/div, 5 dB/div, and 1 dB/div. If
necessary, set VERT POS (R6) to bring the trace into the viewing area.
g. Set the VERTICAL SCALE to 10 dB/div.
h. Adjust VERT POS (R6) on the rear panel to position the trace at the top
graticule line.
2. Adjust Level (R63, R42, R20, R24, R98, R107, R39, and R40 on the
Display Storage board, as follows (See Figure 5--2 on Page 5--13):
a. Enable the checkerboard pattern (Display Storage adjustment pattern) by
pressing UTIL522.
b. Adjust R63 (VOO) to align the top intensified edge of the checkerboard
pattern with the top graticule line.
c. Adjust R42 (VOG) to align the bottom intensified edge of the checker-
board pattern with bottom graticule line.
d. Adjust R98 (HOO) to position the center of the checkerboard pattern at
the center of the screen.
e. Adjust R107 (HOG) for optimum one checkerboard square per division
(edges of the intensified squares position to left and right vertical
graticule lines).
f. Repeat steps d and e to optimize horizontal adjustment due to small
interaction between these adjustments.
g. Press BKSP (once) and adjust R63 (VOO) to center the readouts
between the top and bottom graticule lines.
h. Enable the checkerboard by pressing UTIL522.
i. Adjust R174 (Vector Offset) to align the top intensified line of the
checkerboard with the top graticule line.
j. Press any menu button five times to exit the checkerboard pattern.