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SIGLENT
SVA1000X User Manual 68
selecting either "AM" or "FM" respectively. Pressing Meas, can also select "AM" and "FM".
2.6.3.1 Carrier Frequency
After entering into "AM" or "FM" modulation analysis, set the modulated carrier frequency.
Press Frequency can set the relative parameters
Table 2-47 Carrier Frequency
Parameter
Explanation
Default
100 MHz
Range
Full Span
Unit
GHz、MHz、kHz、Hz
2.6.3.2 IFBW
After entering into the mode "AM" modulation analysis or "FM" modulation analysis, set the
intermediate frequency bandwidth (IFBW).
Press Meas Setup , you can set the "IFBW" again.
It specifies the IFBW of the signal to be analyzed. The measurement accuracy will be impacted
if this value isn't set precisely. The IFBW should be as narrow as possible to improve the S/N
ratio.
For "AM" modulation analysis, the IFBW should be larger than twice the modulation frequency.
For "FM" modulation analysis, the IFBW should be larger than twice the sum of the deviation
frequency and the modulation frequency.
Table 2-48 IFBW
Parameter
Explanation
Default
1.2 MHz
Range
1.2 MHz, 960 kHz, 600 kHz, 480 kHz, 300 kHz,
240 kHz, 120 kHz, 96 kHz, 60 kHz
Unit
MHz, kHz
2.6.3.3 EqLPF
After entering into the mode "AM" modulation analysis or "FM" modulation analysis, set the
equivalent low pass filter (EqLFP).
Press Meas Setup , you can set the "EqLFP" again.
It specifies the EqLPF bandwidth of the signal to be analyzed. The measurement accuracy will
be impacted if this value isn't set precisely. The EqLPF is an additional low pass filter. It can
conveniently measure the lower modulation frequency signal. The EqLPF bandwidth should be
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