User Manual

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21.3 Reference
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2
1.3.5 RMS Recorder Function
-141 V
Two-period
100 Vrms
141 V
Sample the 50 Hz or 60 Hz waveforms at
2
00μs and calculate one RMS value item
u
sing two-period data.
[
Two-period ]
5
0Hz：40 ms 200 sampling data
60 Hz
：
33.4 ms 167 sampling data
1234･･････
･
･･･････10
0
1 min/DIV
Maximum voltag
e
Minimum voltag
e
One piece of sample dat
a
：RMS-value data (20 x 60 [s/division]/100 = 12
)
・For the RMS recorder function, the sampling period is fixed to 20 RMS
value data items per second.
・One division is equal to 100 samples.
■ Calculate one RMS value
(1) Time axis: 5 s/division
Since the sampling period is fixed to 20 RMS-value data items per second, 5
s/division provides 100 RMS-value data items per division. This value is in
agreement with 100 samples per division and, therefore, the voltage axis
does not have a width (upper and lower limits).
(2) Time axis: other than 5 s/division
The maximum and minimum values are specified based on the RMS-value
data (by multiplying 20 RMS-value data items per second by the time-axis
range [s/division]/100), and the data containing these maximum and
minimum values are defined as one item of sample data. When the time-
axis range is set to 1 mm/division, the maximum and minimum values are
specified in the RMS-value data (20 x 60 [s/division]/100 = 12), and the data
containing these maximum and minimum values are defined as one item of
sample data.