3-9
17. Set the UUT output frequency and the Spectrum Analyzer center frequency
to the next frequency listed in part B of Table 3-2.
18. Repeat steps 15 to 17.
19. Set the UUT output to STBY. Remove all connections.
Harmonics and Spurious Signal Content - Levelling Head (96040A and 96270A)
Equipment required for this test:
• Spectrum Analyzer
• 50 Ω Leveling Head (supplied with UUT)
To verify the harmonic and spurious signal content of the UUT output with the
Leveling Head output:
Note
For the 96270A, additional tests are done on the Microwave Output,
as described in subsequent parts of this procedure.
1. Connect the output of the 50 Ω Leveling Head 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 3-7 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 +30 dBm
FREQ 20 kHz
SPAN 100 Hz
Note
Take care 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. If necessary, readjust
the Analyzer’s RF attenuation to achieve the proper mixer input
level.
5. Set the UUT as follows:
Note
For the 96270A, ensure the Leveling Head output is selected.
Mode Leveled Sine
Frequency 20 kHz
Level +24 dBm
Output OPER
6. On the Spectrum Analyzer, push MARKER → PEAK.
7. Set the Spectrum Analyzer as follows:
FREQ 40 kHz (2
nd
harmonic)
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