Common Analysis and Display Functions
R&S
®
FSW
521
User Manual 1173.9411.02 ─ 19
2. For the active delta marker that is to refer to the fixed reference marker, select
"FXD" from the "Ref. Marker" list.
The delta marker indicates the offset of the current trace value at the marker posi-
tion from the fixed reference value.
7.4.4.3
How to Output the Demodulated Signal Accoustically
For long sweep times you may wish to monitor a measurement accoustically rather
than visually to determine when a certain signal level is reached.
Risk of hearing damage
To protect your hearing, make sure that the volume setting is not too high before put-
ting on the headphones.
1. Set marker 1 to the signal level you want to monitor.
2. Press the MKR FUNCT key.
3. Select the "Select Marker Function" softkey.
4. Select the "Marker Demodulation" button.
5. Select the "Marker Demod Config" softkey.
The marker function results are determined immediately according to the default
settings.
6. Define how long you want to hear the output signal when the marker value is
reached by entering the duration in the "Marker Stop Time" field.
Alternatively, the audio signal can be output continuously, regardless of the marker
value; in this case, set "Continuous Demodulation" to "On".
7. Select the modulation type (AM/FM/PM) of the signal.
8. To avoid listening to noise during continuous output, set "Squelch" to "On" and
define the signal level below which the signal is ignored ("Squelch level").
9. Set "Marker Demodulation" to "On".
10. Plug your headphones into the PHONES connector on the front panel of the
R&S
FSW.
11. Adjust the volume using the rotary knob next to the PHONES connector.
During the next or currently running measurement, when the sweep reaches the
marker position, the demodulated signal is output as an audio signal via the head-
phones for the given duration. Or, depending on the configuration, the demodula-
ted signal is continuously output via the headphones, if the signal level exceeds the
squelch level.
Marker Usage
