Locking Of Sampling Frequency; Ac/Dc; Measurement Of Neutral Current; Second" Quantities - AEMC PEL102 User Manual

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Main frequency f = 400Hz
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Inside 340 to 460Hz (400Hz ±15%), sampling period is locked to main frequency.
16 samples are available for each main cycle.
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Outside 340 to 460Hz, sampling period is 16*400Hz.
DC is not a frequency parameter for sampling. A pure DC measured signal is considered to be outside the frequency
ranges. Then, the sampling frequency is, according to the preselected main frequency, 6.4kHz (50/400Hz) or 7.68kHz
(60Hz).
a.1.2.2 Locking of sampling frequency
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By default, sampling frequency is locked on V1
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If V1 is missing, sampling frequency tries to lock to V2, then V3, I1, I2 and I3
a.1.2.3 ac/Dc
The PEL performs AC and DC measurements for alternative current and/or direct current distribution systems. Selection
of AC or DC is done by the user.
AC +DC values are not available with PEL.
NOTE: AC+DC values could be calculated after download using the DataView
a.1.2.4 Measurement of neutral current
For the PEL 102 and PEL 103, according to the distribution system, neutral current is calculated.
a.1.2.5 "1 second" Quantities
The instrument calculates the following quantities every second, according to § A.2.
"1 second" quantities are used for:
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Real time values
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"1 second" trends
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Aggregation of values for "aggregated" trends (see § A.1.2.6)
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Min and max determination for "aggregated" trends
All "1 second" quantities are saved on the SD-Card, during the recording time.
a.1.2.6 aggregation
An aggregated quantity is a value calculated for a defined period, according to the formulas specified in Table 26.
Aggregation periods always start on rounded hours/minutes. Aggregation period is the same for all quantities. The period
is one of the following: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30 and 60mn.
All aggregated quantities are saved on the SD-Card, during the recording session. They can be displayed in the PEL Con-
trol Panel (see § 4.3).
a.1.2.7 Min and Max
Min and Max are the minimum and maximum values of the "1 second" quantities for the considered aggregation period.
They are saved with the date and time of the Min and Max (see Table 25 for the available values).
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