A15
Appendix
Method for verifying aggregation values required by IEC61000-4-30
IEC flicker
For IEC 61000-4-30 Plt values, use only the values sho
wn with even numbered 2-hour intervals, and dis-
card the other Plt values. The other Plt values are pr
ovided for information only, and are not IEC 61000-
4-30 Plt values.
IEC61000-4-30 Class A requires that regardless of the over
all time interval, time clock accuracy must be
within ±20 ms for 50 Hz and within ±16.7 ms for 60 Hz. When accurate time synchronization using an
external signal is not possible, a tolerance of less than ±1 second over 24 hours is permitted, but regard-
less of the overall time interval, accuracy must be wi
thin ±20 ms for 50 Hz and ±16.7 ms for 60 Hz.
By synchronizing the PQ3198 with the PW9005 GPS Box,
the instrument time can be synchronized to
UTC at a high degree of accuracy. In the event that accurate time synchronization using an external sig-
nal, such as that provided by the GPS unit, is not po
ssible, the instrument incorporates a clock capable of
operating at a real-time accuracy of within ±1 second per day (within the specified operating temperature
and humidity range).
3-second aggregated values
(=150/180cycle data)
10-minute aggregated values 2-hour aggregated values
Magnitude of the
Supply Voltage
Applies to average value of
channel Urms values on the
[TIME PLOT] - [TREND]
screen.
Applies to average value of
channel Urms values on the
[TIME PLOT] - [TREND]
screen.
Applies to average value of
channel Urms values on the
[TIME PLOT] - [TREND]
screen.
Voltage
harmonics
Applies to average values on
the [TIME PLOT] - [Harm-
Trend] scre
en.
Applies to average values on
the [TIME PLOT] - [Harm-
Trend] screen.
Applies to average values on
the
[TIME PLOT] - [Harm-
Trend] screen.
Voltage
inter-harmonics
Applies to average values for
ea
ch channel's orders on the
[TIME PLOT] - [Harm Trend] -
[INTERHARM] screen.
Applies to average values for
each channel's orders on the
[TIME PLOT] - [Harm Trend] -
[INTERHARM] screen.
Applies to average values for
each channel's orders on the
[TIME PLOT] - [Harm Trend] -
[INTERHARM] screen.
Supply Voltage
unba
lance
Applies to average value of
unb0 and unb for Uunb on the
[TIME PLOT] - [TREND]
screen.
Applies to average value of
unb0 and unb for Uunb on the
[TIME PLOT] - [TREND]
screen.
Applies to average value of
unb0 and unb for Uunb on the
[TIME PLOT] - [TREND]
screen.
Measurement
condi
tions
• The TIME PLOT interval is
set to 150/180 cycles.
• During analysis, cursor
mea
surement is performed
after setting Tdiv to the min-
imum value.
• The order being checked for
ha
rmonics and inter-har-
monics is selected and dis-
played.
• Recorded items for inter-
h
armonics are set to [All
data].
• The TIME PLOT interval is
set to 10 minutes.
• During analysis, cursor
mea
surement is performed
after setting Tdiv to the min-
imum value.
• The order being checked for
h
armonics and inter-har-
monics is selected and dis-
played.
• Recorded items for inter-
harmonics are set to [All
da
ta].
• The TIME PLOT interval is
set to 2 hours.
• During analysis, cursor
me
asurement is performed
after setting Tdiv to the min-
imum value.
• The order being checked for
harmoni
cs and inter-har-
monics is selected and dis-
played.
• Recorded items for inter-
harmoni
cs are set to [All
data].
Time clock accuracy
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