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Adjustment Procedures
2715 Spectrum Analyzer Service Manual
5-35
Flatness
Preset
(Top View)
R160
R172
Log Board
Figure 5- 11: Presetting the Flatness Adjustments on the Log Board
6. Set the Sweep Generator Time to 0.1, variable fully clockwise, and power level
to 4. If the generator signal is too low or high, use the power level potentiometer
on the Sweep Generator to bring the signal level to mid screen.
7. Allow the Spectrum Analyzer to sweep one full sweep.
8. Press MKR ↑ to place a marker on the peak to the left of 100 MHz.
9. Press DSPL 8 3 to enable a display line through the marker.
10. Enable automatic sweep speed by pressing SWEEP AUTO.
11. Adjust R160 (Slope) and R172 (Slope Offset) on the Log board for flatness
(±1.5 dB) while keeping the marked peak (peak that has a marker on it) at
the display line. See Figure 5--11 for adjustment locations.
Option 50/75 instruments - ±1.5 dB from 9 kHz to 1.8 GHz, ±3 dB from
1.8 GHz to 2.15 GHz.
12. Press SWEEP ↑ three times.
13. Check that the marked peak is still at the display line. If necessary, repeat the
adjustments until flatness is within specification with the marked peak at the
display line.
14. Disconnect the Sweep Generator from the RF INPUT.