4Measurement Of The Filter Or Signal Bandwidth - R&S ESU Series Operating Manual

R&S ESU
Measurement example
The phase noise of a CW signal at 100 MHz with 0 dBm level is to be measured at
800 kHz from the carrier
[PRESET]
[CENTER: 100 MHz]
[SPAN: 2 MHz]
[AMPT: 0 dBm]
[MKR FCTN]
[PHASE NOISE: 800 kHz]
4.8.11.4 Measurement of the Filter or Signal Bandwidth
N DB DOWN The N DB DOWN softkey activates the temporary markers T1 and T2 which are n
dB below the active reference marker. Marker T1 is placed to the left and marker T2
at the right of the reference marker. The value n can be input in a window.
The default setting is 3 dB.
Span > 0:
Span = 0:
If, for example, it is not possible to form the frequency spacing for the n dB value
because of the noise display, dashes are indicated instead of a measured value.
If a negative value is entered than the markers are placed n dB above the active ref-
erence marker. This is then a n dB up function which can be used for notch filter
measurements:
To switch n dB down on or off:
Remote command:
To query the result pulse width:
Remote command:
To query the two marker x-values (in seconds) separated by comma:
Remote command:
Further remote commands:
Remote command:
Operating Manual 1302.6163.12 - 03
The R&S ESU is set to the default setting.
The center frequency is set to 100 MHz.
The span is set to 2 MHz.
The reference level is set to 0 dBm.
MARKER 1 is switched on and positioned at the maxi-
mum of the displayed trace.
The phase noise measurement is switched on. The
delta marker is positioned on the main marker and the
measured phase noise value is displayed in the marker
info field. The sample detector is used and the video
bandwidth is set to 3 × RBW. When the phase noise
measurement function is enabled, the entry of the delta
marker frequency is activated. It can be entered
directly.
The frequency spacing of the two temporary markers is indicated in the
marker info field.
The pulse width between the two temporary markers is indicated in the
marker info field.
CALC:MARK1:FUNC:NDBD:STAT ON
CALC:MARK1:FUNC:NDBD:RES?
CALC:MARK1:FUNC:NDBD:TIME? 'Span = 0
CALC:MARK1:FUNC:NDBD 3dB
CALC:MARK1:FUNC:NDBD:FREQ? 'Span > 0
Instrument Functions
Analyzer Mode
4.157