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15. Spurious Responses Test
SPECTRUM ANALYZER
SYNTHESIZED
SMEEPEA
10
DB
ATTENUATOR
300 MHZ
LPF
J
Figure 2-25. Harmonic Distortion Test Setup
Note
Equipment listed is for two test setups, Figure 2-25 and Figure 2-26.
Equipment
Synthesized Sweeper ........................
...........
HP
8340A
Frequency Synthesizer ...................... HP
3335A
10
dB
Attenuator (2 required) ..............
:
:
ii<
84&A
Opt 010
Lowpass Filter (300 MHz) ...................
.......
HP 0955-0455
Adapter, Type N (m) to BNC (f) (2 required)
........
HP 1250-0780
Adapter, Type N (m) to SMA (f) .............
....... HP 1250-1250
Adapter, Type N (f) to BNC (m) .............
.......
HP 1250-0077
Adapter, Type N (f) to BNC (f) ..............
....... HP 1250-1474
Directional Bridge ........................... ........... HP
8721A
Lowpass Filter (50 MHz) (2 required) .......
.......
HP 0955-0306
Procedure
Harmonic Distortion
1. Connect equipment as shown in Figure 2-25.
2. On the spectrum analyzer, press [INSTR PRESET). Set the controls of
the spectrum analyzer as follows:
CENTER FREQUENCY
.................
..............
280 MHz
FREQUENCY SPAN
....................
................
10
kHz
REFERENCE LEVEL
-
...................
.............
20 dBm
3. On the synthesized sweeper, key in ~NSTR PRESET],
Icw)
280 MHz,
(POWER LEVEL) -10 dBm.
4. On the spectrum analyzer, key in DISPLAY LINE
CENTER]
-90
dBm, MARKER [PEAK SEARCH] to position a marker on the peak of
the displayed 280 MHz signal.
5. On the synthesized sweeper, press
~POWER
LEVEL] and use the
ENTRY knob to adjust the amplitude of the displayed 280 MHz
2-50
Performance Tests