APPENDIX 7
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Appendix 2 Reference
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-141 V
3-period
141 V
1/800seconds
Sample the 50 Hz or 60 Hz waveforms at 250
μ
s
and calculate one RMS value item using three-
period data.
Afterwards, the RMS data is calculated in 1/800
second intervals.
RMS Recorder Function.
Input data sampled at a fixed 250
μ
s rate is subjected to
800 RMS calculations per second.
One division is equal to 80 samples.
Calculate one RMS value
(1) Time axis: 100 ms/division
Since the sampling period is fixed to 800 RMS-value data
items per second, 100 ms/division provides 80 RMS-value
data items per division. This value is in agreement with 80
samples per division and, therefore, the voltage value does
not have a width (upper and lower limits).
(2) Time axis: other than 100 ms/division
The maximum and minimum values are specified based on
the RMS-value data (by multiplying 600 RMS-value data
items per second by the time-axis range [s/division]/80),
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 min/division, the maximum and
minimum values are specified in the RMS-value data
(800
X
60 [s/division] /80 = 600), and the data containing
these maximum and minimum values are defined as one
item of sample data.
