Atec Rohde-Schwarz-FSL3-FSL6 - Manual (Page 10)

10 Spectrum Analyzer ¸FSL
Scalar network analysis
Models .13 and .16 of the ¸FSL, which include a tracking
generator, can quickly and easily measure frequency response,
filters and attenuation. The n-dB down marker determines the
3 dB bandwidth of a bandpass filter at the press of a button,
for example. The ¸FSL measures return loss or matching
by using an external VSWR bridge. Precision is enhanced by
Through, Short and Open calibration methods.
Third order intercept (TOI)
The ¸FSL can determine the TOI from the spectrum at the
press of a button. It automatically detects the useful carriers
and thus determines the intermodulation sidebands. The instru-
ment‘s maximum dynamic range of 95 dB is high for its class.
RF attenuation steps of 5 dB further enhance its usefulness.
Modulation depth measurement (AM%)
The ¸FSL measures the modulation depth of an AM signal
at the press of a button. The AM% marker function positions
three markers – one each on the carrier, the upper sideband,
and the lower sideband – and uses the sideband suppression
to determine the modulation depth. The modulation depth of a
two-tone signal can be determined selectively by predefining
the modulation frequency, for example by starting with a 90 Hz
sideband and then moving to the 150 Hz sideband of an ILS
signal. The high linearity of <0.2 dB ensures a small absolute
measurement error.
The most extensive set of functions in its class