De-Emphasis (Fm Demod Only) - Keysight x-series User Reference Manual

8 Frequency Scan Measurement
Meas Setup
FM
Pressing this key, when it is not selected, selects and activates the FM demodulation function. Pressing it a
second time branches to the FM Demod menu where FM demodulation settings can be adjusted.
Key Path
Example
State Saved
Initial S/W Revision

De-emphasis (FM Demod Only)

The De-emphasis setting controls a single-pole filter (6 dB/octave roll off), usually to counter intentional
pre-emphasis in the transmitter. When De-emphasis state is OFF the hardware digital filter is bypassed,
otherwise the setting is applied.
Key Path
Remote Command
Example
Dependencies
Preset
State Saved
Range
Initial S/W Revision
Off
This setting bypasses the De-emphasis filter.
Key Path
Example
Readback
Initial S/W Revision
25 µs
Sets the De-emphasis time constant to 25µs.
502
Meas Setup, Analog Demod
FSC:DEM FM Turns FM demodulation function ON.
Saved in instrument state.
A.07.00
Meas Setup, Analog Demod, FM
[:SENSe]:FSCan:DEMod:FM:DEEMphasis OFF|US25|US50|US75|US750
[:SENSe]:FSCan:DEMod:FM:DEEMphasis?
FSC:DEM:FM:DEEM US75
FSC:DEM:FM:DEEM?
This key is grayed out when a scan sequence is running. If the grayed out key is pressed, an advisory
message is generated. If the equivalent SCPI command is sent, this same message is generated as
part of a "–221, Settings conflict" warning.
Only available in FM. Grayed out for AM and PM.
US75 (recommended for US commercial FM 75 µs pre-emphasis)
Saved in instrument state.
Off|25(s|50(s|75(s|750(s
A.07.00
Meas Setup, Analog Demod, FM, De-emphasis
FSC:DEM:FM:DEEM OFF
Off
A.07.00
EMI Receiver Mode Reference