99
ELSPEC
G
G
4
4
K
K
F
F
i
i
x
x
e
e
d
d
P
P
o
o
w
w
e
e
r
r
Q
Q
u
u
a
a
l
l
i
i
t
t
y
y
A
A
n
n
a
a
l
l
y
y
z
z
e
e
r
r
U
U
S
S
E
E
R
R
&
&
I
I
N
N
S
S
T
T
A
A
L
L
L
L
A
A
T
T
I
I
O
O
N
N
G
G
U
U
I
I
D
D
E
E
The table outlines the sections' Parameter options (for your selection) including
their Definition:
PARAMETER DEFINITION
PST INST
Instantaneous f licker ev aluation. Output o f Bl ock 5 o f the
Flickermeter in Accordance with IEC61000-4-15 Edition 2
PSST 10 Sec.
An E lspec m easurement d esigned t o g et quicker r esults r egarding
approximation of the EN50160 values, but in a fraction of the time.
The P SST i s calculated the sa me as P ST b ut av eraged over 1 0
seconds. T his E lspec d efined v alue is v aluable i n t hat i t en ables
faster as sessment o f the f licker. E lspec P SST co nverges t o a r eal
value within 3 min from a d rastic flicker change, or immediately for
periodic steady state flicker
PST
Where t he Percentiles , , , , are t he F licker L evels
Exceeded for 0.1, 1, 3, 10 & 50% of the Time During The Observation
Period. T he S uffix “ s” i n the F ormula I ndicates tha t th e Smoothed
Value Should be U sed. The Smoothed Values are Obtained U sing the
Following Formulas:
P(1s) = (P(.7) + P(1) + P(1.5))/3
P(3s) = (P(2.2) + P(3) + P(4))/3
P(10s) = (P(6) + P(8) + P(10) + P(13) + P(17))/5
P(50s) = (P(30) + P(50) + P(80))/3
PST 10 Min Short term flicker evaluation.
P
ST
PLT
is a v alue m easured over 1 0 m inutes t hat ch aracterizes the
likelihood t hat t he v oltage f luctuations w ould r esult in p erceptible
light f licker. A v alue o f 1 .0 is d esigned t o r epresent that 5 0% o f
people would perceive flicker in a 60 watt incandescent bulb.
Where (i = 1 , 2, 3 , ...) a re C onsecutive Readings of t he S hort-
Term Severity
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