Hioki 8841 - Page 455

APPENDIX 11
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Appendix 3 Reference
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Appendix 3.5 RMS Recorder Function
-141 V
Two-
p
eriod
100 Vrms
141 V
Sample the 50 Hz or 60 Hz waveforms
a
200
μ
s and calculate one RMS value it
e
using two-period data.
[ Two-period ]
50 Hz: 40 ms 200 sampling data
60 Hz: 33.4 ms 167 sam
p
lin
g
data
1234
･･･････
1min/DIV
Maximum voltag
e
Minimum voltag
e
One piece of sample data
: RMS-value data (20 x 60 [s/division]/100 = 12)
･･･････
100
・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.