NARDA NBM-550, Operating Manual

Page: 86 / 156

6 Measurements with the NBM-550 and EHP-50
76
NBM-550 Narda
means that 1 s will be displayed even if an interval time of
10 s is necessary, for example. The table below shows the
relationship between span and timer interval:
Generally the measurement time or refresh rate for the
result display in LF mode depends on the selected span.
Note:
Timer logging results obtained in LF mode can be
subsequently averaged using the optionally available NBM-
TS PC software. RMS/MEAN and MEDIAN post average
evaluations are available.
Note:
Since uninterrupted measurement is not possible in LF
mode (except for WPM), the measurement results are not
summarized into Min/Max/Avg values for each
measurement interval. The Actual values are recorded once
every interval instead.
Span Timer interval
100 Hz
≥
10 s
200 Hz
≥
5 s
500 Hz
≥
2 s
> 500 Hz
≥
1 s
Span Measuring time
100 Hz approx. 4 s
200 Hz approx. 2 s
> 500 Hz approx. 1 s