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

11 APD 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), used to counter intentional pre-
emphasis in the transmitter. When the De-emphasis state is OFF the hardware digital filter is bypassed,
otherwise the setting is applied.
Key Path
Remote Command
Example
Notes
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 25∝µs.
954
Meas Setup, Analog Demod Tune&Listen
APD:DEM FM Turns FM demodulation function ON.
Saved in instrument state
A.13.00
Meas Setup, Analog Demod, FM
[:SENSe]:APD:DEMod:FM:DEEMphasis OFF|US25|US50|US75|US750
[:SENSe]:APD:DEMod:FM:DEEMphasis?
APD:DEM:FM:DEEM US75
APD:DEM:FM:DEEM?
Only available in FM. Grayed out for AM and PM.
US75
Saved in instrument state
OFF|US25|US50|US75|US750
A.13.00
Meas Setup, Analog Demod Tune&Listen, FM, De-emphasis
APD:DEM:FM:DEEM OFF
Off
A.13.00
EMI Receiver Mode Reference