Measurement Basics
R&S
®
FSW-K7
29User Manual 1173.9240.02 ─ 17
4.3 Sample Rate, Measurement Time and Trigger Offset
The maximum demodulation bandwidths that can be obtained during the measure-
ment, depending on the sample rate, are listed in the tables below for different demod-
ulation filter types. The allowed value range of the measurement time and trigger offset
depends on the selected demodulation bandwidth and demodulation filter. If the AF fil-
ter or the AF trigger are not active, the measurement time increases by 20 %.
A maximum of 24 million samples can now be captured, assuming sufficient memory is
available; thus the new maximum measurement time has also increased, according to
the following formula:
Meas.time
max
= Sample count
max
/ sample rate
The minimum trigger offset is (-Meas.time
max
)
Table 4-1: Sample Rate, Measurement Time and Trigger Offset using a flat demodulation filter
Demod. band-
width
Sample rate Measurement time Trigger offset
Min. Max. Min. Max.
500 MHz
6)
600 MHz 1.66 ns 40 ms -40 ms 0.3495 s
320 MHz
5)
400 MHz 2.5 ns 60 ms -60 ms 0.5243 s
160 MHz
4)
200 MHz 5 ns 120 ms -120 ms 1.0486 s
80 MHz
3)
128 MHz 7.8125 ns 187.5 ms -187.5 ms 1.6384 s
40 MHz
2)
64 MHz 15.625 ns 375 ms -375 ms 3.2768 s
28 MHz
1)
64 MHz 15.625 ns 375 ms -375 ms 3.2768 s
18 MHz 32 MHz 31.25 ns 750 ms -750 ms 6.5536 s
10 MHz 32 MHz 31.25 ns 750 ms -750 ms 6.5536 s
8 MHz 16 MHz 62.5 ns 1.5 ms -1.5 ms 13.1072 s
5 MHz 8 MHz 125 ns 3 ms -3 ms 26.2144 s
3 MHz 4 MHz 250 ns 6 ms -6 ms 52.4288 s
1.6 MHz 2 MHz 500 ns 12 ms -12 ms 104.8576 s
800 kHz 1 MHz
1 µs
24 ms -24 ms 209.7152 s
400 kHz 500 kHz
2 µs
48 ms -48 ms 419.4304 s
200 kHz 250 kHz
4 µs
96 s -96 s 838.8608 s
100 kHz 125 kHz
8 µs
192 s -192 s 1677.7216 s
50 kHz 62.5 kHz
16 µs
384 s -384 s 3355.4432 s
25 kHz 31.25 kHz
32 µs
768 s -768 s 6710.8864 s
12.5 kHz 15.625 kHz
64 µs
1536 s -1536 s 13421.7728 s
6.4 kHz 7.8125 kHz
128 µs
3072 s -3072 s 26843.5456 s
Sample Rate, Measurement Time and Trigger Offset
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