Tektronix SPECMON3 Manual page 134

General Signal Viewing
use the POI time value to determine if you are at risk of either missing a narrow transient or of its
captured amplitude being less than the actual signal.
Minimum signal duration vs. RBW
Span RBW (kHz)
110 MHz
85 MHz
40 MHz
25 MHz
xxx
Transforms/s – This is the number of transforms/second being performed by the DPX engine.
It is a function of the selected resolution bandwidth and number of trace points. The desired
RBW determines the number of points required in each transform, which alters the transform rate.
Additionally, the selected trace length may place requirements on the number of points required in
the transform independent of the selected resolution bandwidth.
FFT Points – The approximate number of points in the FFT of the input signal. FFT points provides
an indication of frequency resolution, but it is not an exact measurement. Note that higher numbers
for FFT points mean that the instrument is taking a longer string of input samples for each FFT,
which decreases the time resolution.
122
FFT length
10000
1000
300
100
30
20
1000 1024
300 2048
100 4096
30 16384
20 16384
1000 1024
300 1024
100 2048
30 4096
20 8192
10 16384
300 1024
100 1024
30 4096
20 4096
10 8192
Spectrums/s
1024
1024
2048
4096
16,384
32,768
292,969
146,484
73,242
18,311
18,311
292,969
292,969
146,484
73,242
36,621
18,311
292,969
292,969
73,242
73,242
36,621
SPECMON3 & SPECMON6 Printable Help
Minimum signal duration
for 100% POI, μs
292,969
146,484
73,242
18,311
9,155
5.8
11.4
37.6
134.6
174.6
5.8
11.4
30.8
93.6
147.3
294.5
11.4
27.5
93.8
133.9
267.8
Prefs Tab
3.7
5.8
14.8
37.6
134.6
229.2