Measurement System; Measurements; Overall Metrics - Larson Davis SoundAdvisor 831C Reference Manual

A.3.3 Measurement System
Integration Method:
• Equivalent level integration method can be
Linear or Exponential.
• Exponential integrates the output of the
selected time weighting (Slow, Fast or
Impulse)
Integration Time:
• Minimum: 0.1 s
• Maximum, <0.5dB error: > 23 days
Frequency Weightings: A, C, Z parallel and
simultaneous for each Time Weighting, selected
frequency weighting (A, C or Z) indicated by 
Peak Frequency Weightings: A, C, Z parallel, selected
peak frequency weighting (A, C or Z) indicated by 
Time Weightings/Detectors: Slow, Fast, Impulse,
Linear and Peak simultaneously, selected time
weighting (S, F or I) indicated by 
Peak Rise Time: 30 µs
A.3.4 Measurements
Instantaneous "Live" Metrics
For display and profile graph, not stored with
measurement.
A primary frequency and time weighting is selected by
setting for RMS and Peak level to display, all levels are
available in an "Any Level" matrix.
Time
A
Weighting
Linear L
Aeq
Slow L
AS
Fast L
AF
Impulse L
AI
Peak L
Apeak
A.3.5 Overall Metrics
A primary frequency and time weighting is selected by
setting for RMS and Peak level to display, all levels are
available in an "Any Level" matrix.
Time
A
Weighting
1
Linear L
Aeq
2
Linear L
AƬeq
Slow L
ASmin
Maximum
Slow L
ASmax
Minimum
1. Linear integration method selected by user
2. Exponential Integration method selected by user
SoundAdvisor Model 831C
C Z Units
L L dB
Ceq Zeq
L L dB
CS ZS
L L dB
CF ZF
L L dB
CI ZI
L L dB
Cpeak Zpeak
C Z Units
L L dB
Ceq Zeq
L L dB
CƬeq ZƬeq
L L dB
CSmin ZSmin
L L dB
CSmax ZSmax
Fast L
AFmin
Minimum
Fast L
AFmax
Maximum
Impulse L
AImin
Minimum
Impulse L
AImax
Maximum
Peak L
Apeak(max)
1. Linear integration method selected by user
2. Exponential Integration method selected by user
Occurrence Time for Minimum and Maximum Levels
Time
A
Weighting
Slow T
ASmin
Maximum
Slow T
ASmax
Minimum
Fast T
AFmin
Minimum
Fast T
AFmax
Maximum
Impulse T
AImin
Minimum
Impulse T
AImax
Maximum
Peak T
Apeak(max)
Percentile Levels, percentages
selectable, 0.01 to 99.99%
Statistics are sampled every 10ms from the selected
frequency and time weighted detector.
1
2
3
4
5
6
Exceedance Metrics, exceedance levels (L1, L2, P1, P2
and P3) selectable in dB from 0.0 to 200.0, counts each
L L
CFmin ZFmin
L L
CFmax ZFmax
L L
CImin ZImin
L L
CImax ZImax
L L
Cpeak(max) Zpeak(max)
C Z
T T
CSmin ZSmin
T T
CSmax ZSmax
T T
CFmin ZFmin
T T
CFmax ZFmax
T T
CImin ZImin
T T
CImax ZImax
T T
Cpeak(max) Zpeak(max)
n1 through
Units
L dB
ωƬn1
L dB
ωƬn2
L dB
ωƬn3
L dB
ωƬn4
L dB
ωƬn5
L dB
ωƬn6
dB
dB
dB
dB
dB
Units
y/m/d
h:m:s
y/m/d
h:m:s
y/m/d
h:m:s
y/m/d
h:m:s
y/m/d
h:m:s
y/m/d
h:m:s
y/m/d
h:m:s
n6
A-11