170
RF Section Troubleshooting
Troubleshooting
Press Mech Atten and enter 6 dB. The 50 MHz calibrator signal measured on
the functioning Spectrum Analyzer should measure 6 dB lower than the
previous step (~−31 dBm) as shown in Figure 4-16.
Figure 4-16 50 MHz Calibrator Signal on Output of Attenuator B
(with 6 dB Attenuation)
Press Mech Atten and enter 10 dB. The 50 MHz calibrator signal measured on
the functioning Spectrum Analyzer should measure 10 dB lower than the first
step (~−35 dBm). Continue testing all the attenuation settings as described in
Table 4-11.
Table 4-11
Attenuator Setting (dB) Expected Level
(dBm @ 50 MHz)
Tolerance
16 −41 ±3 dB
20 −45 ±3 dB
30 −55 ±3 dB
40 −65 ±4 dB
50 −75 ±4 dB
60 −85 ±4 dB
66 −91 ±4 dB
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