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Meas Setup
Channel BW (FM Demod)
Sets the RBW setting used by the hardware during the demodulation period in nonzero spans. Note that
this is a separate parameter only for the demodulation function and does not affect the RBW setting in
the BW menu which is used during the normal sweep. The flat top filter type must be used during the
demodulation period. A 5 kHz Video Bandwidth filter is used.
In Zero Span, the test set’s RBW & VBW filters are used for the demodulation; thus, the Channel BW
(and RBW filter type) will match those of the test set. This allows gap-free listening. The Channel BW
key is grayed out and the value displayed on the key matches the current RBW of the test set. Upon
leaving zero span, the previous setting of Channel BW and the flattop filter type are restored.
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
The De-emphasis key is only available when FM is the demod selected. It is grayed out for AM and PM.
State Saved Saved in instrument state.
Initial S/W Revision Prior to A.02.00
Key Path
Meas Setup, Analog Demod Tune&Listen, FM
Remote Command [:SENSe]:DEMod:FM:BANDwidth:CHANnel <freq>
[:SENSe]:DEMod:FM:BANDwidth:CHANnel?
Example DEM:FM:BAND:CHAN 200 MHz
Notes This key / command is grayed out in zero span
Dependencies Unavailable in zero span.
Couplings In zero span only, the value is set equal to the test set’s current RBW value and
it displays that value on the key, but the key is grayed out.
Preset 150 kHz
State Saved Saved in instrument state.
Min 390 Hz
Max 8 MHz
Default Unit Hz
Initial S/W Revision Prior to A.02.00
Key Path
Meas Setup, Analog Demod Tune & Listen, FM
Remote Command [:SENSe]:DEMod:FM:DEEMphasis OFF|US25|US50|US75|US750
[:SENSe]:DEMod:FM:DEEMphasis?