4.3 Making System Settings
53
Measured frequency settings
• Set the frequency used for internal processing.
• Be sure to note that the calculation result, particularly for harmonics,
will be incorrect, if the setting deviates from the nominal frequency of
the measuring line.
• If set to 50 Hz, 10 waveforms are used to calculate harmonics, if set to
60 Hz, 12 waveforms are used to calculate harmonics, and , if set to
400 Hz, 80 waveforms are used to calculate harmonics.
• If the PLL unlocks due to power failure or another reason, sampling
synchronous at the set frequency is internally generated for calcula-
tion.
MEASURE
Frequency
Select from pull-
down menu
Confirm
Cancel
50 Hz, 60 Hz, 400 Hz
Inter-harmonics, flicker and EN50160 cannot be measured at 400
Hz.
PLL source settings
MEASURE
PLL Source
Select from pull-
down menu
Confirm
Cancel
U1, U2, U3
The PLL source is the source used to measure frequencies.
The frequency measurement range is 42.500 Hz to 69.000 Hz.
When the 400 Hz measurement frequency is selected, the fre-
quency measurement range is 360 to 440 Hz.
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