96000 Series
Service Manual
3-10
8. Using the Spectrum Analyzer delta marker functions, measure the amplitude
on the Spectrum Analyzer for the UUT's 2
nd
harmonic relative to the
fundamental. The (delta marker) value shown must be within the tolerance
listed in Table 3-3 for 2nd harmonic.
Note
If Signal content at the required harmonic frequency is well below
the tolerance limit, it can be difficult to observe on the Analyzer
display with the above settings. Provided the harmonic signal is
below the allowed limit the test result can be recorded as “Pass”.
However, 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 (delta
marker) value shown must be within the tolerance listed in Table 3-3 for 3rd
harmonic.
Front
Rear
RF Input
50
Leveling Head
Ext Ref Input
Spectrum Analyzer
Ref Frequency
Output
Instrument
hpn207.eps
Figure 3-4. Equipment Connections - Harmonics and Spurious Content Test
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