Appendix 5 Detailed Explanation of IEC Flicker and DV10 Flicker
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Appendix
Weighting Filter You can select a weighted filter for either a 230 V lamp system or a 120 V lamp
system.
Statistical
Processing
Statistics on flicker are compiled by applying the cumulative probability function
(CPF) to 1,024 logarithmic divisions of instantaneous flicker values S(t) in the
range from 0.0001 to 10000 P.U. to obtain cumulative probabilities P0.1, P1s,
P3s, P10s, and P50s.
Short Interval
Flicker Value
Pst
This indicates degree of perceptibility (severity) of flicker measured over a 10-
minute period.
Calculation:
Pst =
P50s = (P30+P50+P80)/3
P10s = (P6+P8+P10+P13+P17)/5
P3s = (P2.2+P3+P4)/3
P1s = (P0.7+P1+P1.5)/3
P0.1 is not smoothed
Long Interval
Flicker Value
Plt
Indicates the degree of perceptibility (severity) of flicker determined from succes-
sive Pst measurements over a 2-hour period.
To calculate a moving average of Pst, the displayed value is updated every 10
minutes.
Calculation:
Plt =
0.0314P0.1+0.0525P1s+0.0657P3s+0.28P10s+0.08P50s
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