Common Analysis and Display Functions
R&S
®
FSMR3000
217
User Manual 1179.0116.02 ─ 02
X-Value of the Measurement Point
As described in
"Mapping Samples to measurement Points with the Trace Detector"
on page 215, the number of samples taken during a measurement can be much larger
than the number of measurement points that are displayed in the measurement trace.
To determine the x-value of the measurement point, two different methods are availa-
ble:
●
Start/stop
●
Bin-centered
Start/stop
This is the default (legacy) method for trace values in the frequency domain. The x-
value of the first measurement point corresponds to the starting point of the full mea-
surement span. The x-value of the last measurement point corresponds to the end
point of the full measurement span. All other measurement points are divided evenly
between the first and last points. The distance between two measurement points is
span/(<no_measurement_points> -1).
Bin-centered
This is the default method for all marker values. The full measurement span is divided
by the number of measurement points. The result is the span that is evaluated for an
individual measurement point, also referred to as a
bin
. The x-value of the measure-
ment point is then defined as the x-value at the center of the bin (bin/2).
video
signal
s1 s2 s3 s4 s5 s6 s8 s1
video
signal
s1 s2 s3 s4 s5 s6 s8 s1
Measurement point n
Video
Signal
Meas. point n+1
Span/<no. of meas points>
x
n
x
n+1
Span/<no. of meas points>
x
Using the bin-centered method, the first and last x-values of the trace are not identical
to the exact starting and end point of the measurement span. The distance between
two measurement points is span/(<no_measurement_points>) or span/bin_size.
Marker values are always determined using the bin-centered method. Markers placed
on the first and last x-values of the measured span indicate the same results as the
first and last trace point.
Trace Configuration