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5820A
Service Manual
3-60
1.
Program the Calibrator Mainframe for an output of 5.5 V @ 600 MHz.
2.
Set the Spectrum Analyzer to the parameters listed below:
Spectrum Analyzer Setup
Start Frequency
10 MHz
Stop Frequency
800 MHz
Resolution Bandwidth
30 kHz
Video Bandwidth
3 kHz
Reference Level
20 dBm
The Spectrum Analyzer will display a spur at 153 MHz. Refer to Figure 3-10 to
identify the spur.
3.
You need to adjust the wave until the spur is at a minimum. To do this, slowly rotate
R1 (shown in Figure 3-10) counterclockwise until the spur is at a minimum. As you
adjust it, the spur will move down the waveform, towards the right. As soon as the
spur is minimized, stop rotating R1. If you rotate it too far, the spur will reappear.
Once you have turned R1 to the point at which the spur is at a minimum, the signal
is balanced between the VCOs, and you have completed the adjustment.
R1
153 MHz
Spur
om052f.eps
Figure 3-10. Adjusting the Leveled Sine Wave Balance
3-66. Adjusting the Leveled Sine Wave Harmonics
The following procedure adjusts the harmonics for the leveled sine wave function.
Note
This procedure should only be used for adjusting the leveled sine wave
harmonics. Do not use this procedure as a verification test. The
specifications in this procedure are not valid for verification.
1.
Set the Spectrum Analyzer to the parameters listed below:
Spectrum Analyzer Setup
Start Frequency
50 MHz
Stop Frequency
500 MHz
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