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1072
Meas Setup
N dB Points Results Query
More Information
A marker should be placed on the peak of interest before turning on N dB points. The N dB points
function looks for the two points on the marker’s trace closest to the marker’s X-axis value that are N dB
below the marker’s amplitude, one above and the other below the marker’s X-axis value. (That is, one
point is to the right and one is to the left of the selected marker.) The selected N dB value is called the
offset. The function reports the frequency difference (for frequency domain traces) or time difference
(for time domain traces) between those two points.
Each point is identified by a horizontal arrow pointing towards the marker, next to the trace. The arrows
used by the N dB Points function is as shown in the figure below (where each square represents one
pixel). They point in, horizontally, at the trace below a peak, on either side of its skirts. There is one pixel
between the arrow and the trace
Remote Command :CALCulate:BWIDth|BANDwidth:NDB <rel_ampl>
:CALCulate:BWIDth|BANDwidth:NDB?
:CALCulate:BWIDth|BANDwidth[:STATe] OFF|ON|0|1
:CALCulate:BWIDth|BANDwidth[:STATe]?
Notes If the selected marker is turned
Off it turns off N dB Points.
N DB Points is unaffected by Auto Couple
Preset Off, 3.01 dB
OFF
Preset Off, 3.01 dB
OFF
State Saved The on/off status and the offset value are both saved in instrument state.
Min –140 dB
Max –0.01 dB
Initial S/W Revision Prior to A.02.00
Remote Command: :CALCulate:BWIDth|BANDwidth:RESult?
Example: :CALC:MARK:AOFF set selected marker to 1
:CALC:MARK:MAX put marker 1 on peak
:CALC:BWID ON turn on N dB for the selected marker (1)
:CALC:BWID:NDB–3.01 set the offset to –3.01 dB
:CALC:BWID:RES? Query the result
Notes: –100 returned if invalid reading
Initial S/W Revision: Prior to A.02.00