Performance Tests
Performance Test 3
3-71
Note
Signal content at the required harmonic frequency may be well
below the tolerance limit, and difficult to observe on the Analyzer
display with the above settings. Provided the harmonic signal is
below the allowed limit, the test result may be recorded as “Pass”.
However, if it is desired to measure the actual signal level, reduce
the analyzer resolution bandwidth setting and/or reduce the analyzer
reference level setting. Remember to restore the analyzer reference
level setting to that shown in step 4 before changing the UUT to the
next fundamental output frequency, otherwise the Analyzer may be
overloaded and invalid results obtained.
9. Set the Spectrum Analyzer as follows:
FREQ 60 kHz (3
rd
harmonic)
MARKER
→ PEAK
10. Using the Spectrum Analyzer marker functions, measure the marker
amplitude on the Spectrum Analyzer for the UUT’s 3
rd
harmonic. The
displayed (delta marker) value must be within the limit listed in Table 3-29 for
3
rd
harmonic.
Front
Rear
RF Input
Ext Ref Input
Spectrum Analyzer
Instrument
hpn372.eps
Figure 3-20. Equipment Connections – Microwave Output Harmonics and Spurious Content Test
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