SV 977D User Manual - Appendixes
Leve is calculated for: T
d
= 0, T
e
≠ 0,
T
n
= 0.
(
)
(
)
+
=
e
T
2
0W
e
dtptr
T
1
log01dB5Le
Lnight is calculated for: T
d
= 0, T
e
= 0,
T
n
≠ 0.
(
)
(
)
+
=
n
T
2
0W
n
dtptr
T
1
log01dB10Ln
Lde is calculated for: T
d
≠ 0, T
e
≠ 0,
T
n
= 0.
(
)
+
+
=
10Le10Ld
1041012
412
1
log10Lde
Len is calculated for: T
d
= 0, T
e
≠ 0,
T
n
≠ 0.
(
)
+
+
=
10Ln10Le
108104
84
1
log10Len
Lnd is calculated for: T
d
≠ 0, T
e
= 0,
T
n
≠ 0.
(
)
+
+
=
10Ld10Ln
1012108
128
1
log10Lnd
Lden is calculated for: T
d
≠ 0, T
e
≠ 0,
T
n
≠ 0.
(
)
+
+
+
+
=
10Ln10Le10Ld
1081041012
4812
1
log10Lden
Expected value. Calculated on the basis
of 100ms RMS results.
Standard deviation. Calculated on the
basis of 100ms RMS results.
Noise Rating, measured noise level that
takes into account the frequency content
of the noise.
NR is calculated if 1/1 Octave function is
active.
To calculate the NR value, the noise level in each
1/1 octave band (from 31.5Hz to 8kHz) is
compared to the “NR curves” for each
corresponding band. The NR curve number
which applies to each frequency band is the
highest numerical value that is not exceeded in
that band. The overall NR value is the highest of
the individual NR values for the frequency bands.
Noise Criterion, measured noise level that
takes into account the frequency content
of the noise.
NC is calculated if 1/1 Octave function is
active.
To calculate the NC value, the noise level in each
1/1 octave band (from 63Hz to 8kHz) is
compared to the “NC curves” for each
corresponding band. The NC curve number
which applies to each frequency band is the
lowest numerical value that is not exceeded by
each individual frequency band. The overall NC
value is the highest of the individual NC values
for the frequency bands.
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