Adjustment Procedures
5-18 2715 Spectrum Analyzer Service Manual
1. Initialize instrument settings by pressing UTlL 0.
2. Disable frequency correctionsby pressing UTIL435.Press an y menu
button to exit the menu.
3. Recall default frequency normalizatio n values by pressing UTIL5508Y.
Press any menu button to exit the menu. Set FREQUENCY at 0 Hz.
4. Adjust R931 (Main Coil Offset) on the PhaseLock CF C boardto center the
0 Hz signal. Use the SPAN/DIV ↓to reducethe span/div to 1 MHz while
keeping the signal centeredwith R931.
5. Press MAX SPAN twiceand check that the 0 Hz signal is within 2 minor
divisions of center screen. If necessary,readjust R931 on the Phase Lock
CFC board to center the 0 Hz signal.
6. Repeat step 5 until the 0 Hz signal remainswithin 2 minor divisions of
center screen.
7. Select the following settings on the Spectrum Analyzer:
FREQUENCY 500 MHz
REF LEVEL --30 dBm
SPAN/DIV 100 MHz
RES BW 300 kHz
VID FLTR OFF
VERT SCALE 10 dB/div
8. Enable the calibrator signal by pressing INPUT 9.
9. Disable DISPLAYSTORAGE (analog display mode on) and the
READOUT.
10. Set the FREQ/MKRS knob such that a mark (harmonic of the calibrator
signal) is at center screen.
11. Adjust R918 (Main SWP Gain) on the Phase Lock CFC board for one mark
per division.
12. Enable DISPLAYS TORAGE D.
13. Disable the calibrator signal by pressing INPUT 9.
14. Apply 0.2 s time marks to the RF INPUT.
15. Reset FREQUENCY to 25 MHz and SPAN/DIV to 5 MHz. Usethe
FREQ/MKRS knob to position a mark at center screen.
16. Adjust R920 (FM SWP Gain) on the Phase Lock CFC board for one mark
per division.