12.2 Measurement Specifications
187
Voltage Swell
Displayed items
Swell amplitude and duration
Threshold and hysteresis
% of basic voltage
Voltage swell height
swell to (threshold)%
When measuring at 50 Hz or 60 Hz, if the RMS voltage (value calculated for
one waveform shifted over half a wave) exceeds the threshold in the right
direction, the swell is detected and the threshold height displayed.
When measuring at 400 Hz, if the maximum of four RMS voltage values
(400 Hz, single-cycle calculation) that exist within 20 ms exceeds the
threshold in the positive direction, swell is detected at the threshold ampli-
tude.
Voltage swell interval
The interval from the time of swell is detected until the threshold minus the
hysteresis is exceeded in the wrong direction.
Voltage Dip
Displayed items
Dip depth and duration
Threshold and hysteresis
% of basic voltage
Voltage dip depth
dip to (threshold)%
When measuring at 50 Hz or 60 Hz, if the RMS voltage (value calculated for
one waveform shifted over half a wave) exceeds the threshold in the wrong
direction, the dip is detected and the threshold depth displayed.
When measuring at 400 Hz, if the minimum of four RMS voltage values (400
Hz, single-cycle calculation) that exist within 20 ms exceeds the negative
threshold, dip is detected at the threshold amplitude
Voltage dip interval
The interval from time the dip is detected until the threshold added the hys-
teresis is exceeded in the right direction.
Interruption
Display items
Interruption interval (and interruption depth)
Threshold and hysteresis
% of basic voltage
Interruption depth
Interruption to (threshold)%
When measuring at 50 Hz or 60 Hz, if the RMS voltage (value calculated for
one waveform shifted over half a wave) exceeds the threshold in the wrong di-
rection, the interruption is detected and the threshold height displayed.
When measuring at 400 Hz, if the minimum of four RMS voltage values (400
Hz, single-cycle calculation) that exist within 20 ms exceeds the negative
threshold, interruption is detected at the threshold amplitude
Interruption interval
The interval from the time of interruption is detected until the threshold add-
ed the hysteresis is exceeded in the right direction.
Frequency
Measurement method
Reciprocal frequencies are sampled at 2 MHz about once every 10 cycles
at 50 Hz or every 12 cycles at 60 Hz (approximately every 200 ms).
Waveform consists of 256 points/8 cycles, measured every 80 cycles at 400
Hz (approx. 200 ms)
Measurement range
42.500 Hz to 69.000 Hz, 360 Hz to 440 Hz
Measurement range
99.999 Hz, 999.99 Hz
Measurement source
One of voltages U1, U2 or U3 (the same as the PLL synchronization source)
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