Analog Demodulation (Option K7) - Rohde & Schwarz R&S FSL3 Operating Manual

Analog Demodulation (Option K7)

Analog Demodulation (Option K7)
The digital signal processing in the R&S FSL, used in the analyzer mode for digital IF filters, is also
ideally suited for demodulating AM, FM, or PM signals. The firmware option R&S FSL–K7 provides the
necessary measurement functions.
The R&S FSL is equipped with a demodulator that is capable of performing AM, FM, and PM
demodulation at a time. Additionally maximum, minimum and average or current values can be
obtained parallelly over a selected number of measurements.
By sampling (digitization) already at the IF and digital down–conversion to the baseband (I/Q), the
demodulator achieves maximum accuracy and temperature stability. There is no evidence of typical
errors of an analog down–conversion and demodulation like AM to FM conversion and vice versa,
deviation error, frequency response or frequency drift at DC coupling.
This option is available from firmware version 1.10.
To open the analog demodulation menu
If the Analog Demodulation mode is not the active measurement mode, press the MODE key and
activate the Analog Demodulation option.
If the Analog Demodulation mode is already active, press the MENU key.
The analog demodulation menu is displayed. If the tracking generator (models 13, 16 and 28) or the
power meter (option Power Sensor Support, K9) is available, softkeys for these functions are also
provided.
Menu and softkey description
– "Softkeys of the analog demodulation menu"
– "Softkeys of the frequency menu (Analog Demodulation mode)"
– "Softkeys of the span menu (Analog Demodulation mode)"
– "Softkeys of the amplitude menu (Analog Demodulation mode)"
– "Softkeys of the bandwidth menu (Analog Demodulation mode)"
– "Softkeys of the sweep menu (Analog Demodulation mode)"
– "Softkeys of the trigger menu (Analog Demodulation mode)"
Apart from the power measurement menu that is not available in the Analog Demodulation mode, all
other menus are provided as described for the base unit. For details refer to the corresponding menu
descriptions.
To display help to a softkey, press the HELP key and then the softkey for which you want to display
help. To close the help window, press the ESC key. For further information refer to section "How to use
the Help System".
Further information
– "Circuit description – block diagrams"
– "Demodulation bandwidth"
– "AF trigger" on page 4.142
– "Stability of measurement results"
– "Sample rate, measurement time and trigger offset"
1300.2519.12
on page 4.144
on page 4.141
on page 4.142
on page 4.142
4.140
on page 4.150
on page 4.152
on page 4.153
on page 4.155
on page 4.155
on page 4.156
on page 4.143
R&S FSL
E-11