96000 Series
Service Manual
3-70
Microwave Output Harmonics and Spurious Signal Content (96270A)
Equipment required for this test:
• Spectrum Analyzer
To verify the harmonic, sub harmonic, interharmonic, and spurious signal
content of the UUT Microwave Output:
1. Connect the UUT front panel Microwave Output to the RF INPUT of the
Spectrum Analyzer.
2. Connect the REF FREQUENCY OUTPUT (rear panel) from the UUT to the
Spectrum Analyzer Ext Ref In (on rear). See Figure 3-20 for equipment
connections.
3. On the UUT enable the REF FREQUENCY OUTPUT at 10 MHz.
4. Set the spectrum analyzer as follows:
PRESET
EXT REF On
COUPLING DC
REF LVL +24 dBm
FREQ 20 kHz
SPAN 100 Hz
Note
Care must be taken to ensure that signals applied to the spectrum
analyzer do not exceed its input mixer’s optimum operating level,
causing false harmonic signal levels to be measured. It may be
necessary to readjust the analyzer’s RF attenuation to achieve the
proper mixer input level.
5. Set the UUT as follows:
Mode Leveled Sine
Signal Microwave Output
Frequency 20 kHz
Level +16 dBm
Output OPER
6. On the Spectrum Analyzer, push MARKER
→ PEAK.
7. Set the spectrum analyzer as follows:
FREQ 40 kHz (2nd harmonic)
8. Using the Spectrum Analyzer delta marker functions, measure the amplitude
on the Spectrum Analyzer for the UUT's 2nd harmonic relative to the
fundamental. The displayed (delta marker) value must be within the limit
listed in Table 3-28 for 2nd harmonic.
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