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R&S FSP
Instrument Functions
Analyzer Mode
4.5.11.4
N DB DOWN
Measurement of the Filter or Signal Bandwidth
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:
The frequency spacing of the two temporary markers is indicated in the
marker info field.
Span = 0:
The pulse width between the two temporary markers is indicated in the
marker info field.
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 reference 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:
CALC:MARK1:FUNC:NDBD:STAT ON
To query the result pulse width:
Remote command:
CALC:MARK1:FUNC:NDBD:RES?
To query the two marker x-values (in seconds) separated by comma:
Remote command:
CALC:MARK1:FUNC:NDBD:TIME? 'Span = 0
Further remote commands:
Remote command:
4.5.11.5
CALC:MARK1:FUNC:NDBD 3dB
CALC:MARK1:FUNC:NDBD:FREQ? 'Span > 0
Measurement of a Peak List
PEAK LIST
NEW SEARCH
SORT MODE (FREQ LEVEL)
PEAK EXCURSION
LEFT LIMIT | RIGHT LIMIT
THRESHOLD
PEAK LIST OFF
PEAK LIST EXPORT
DECIM SEP
The PEAK LIST softkey allows the peak values of the trace to be determined and
entered in a list with 50 entries max. The order of the entries is defined by the SORT
MODE:
•
4.64
FREQ: sorting in ascending order of frequency values (see screenshot); if span =
0, the entries are sorted in ascending order of time values
Operating Manual 1164.4556.12 - 06