2 Introduction
2.1 Main Features
2.2 Measurement Functions
The measurement functions that can be provided by the CR:800C depend upon the
options that have been fitted.
Listed below is a summary of the measurements that can be provided by the basic
Broadband instrument, and by the addition of the 1:1 Octave Band or the 1:3 Octave
Band filters.
If the Auto Repeat function is used, the CR:800C can be made to repeat a broadband
measurement up to 999 times. The instrument can also be configured to synchronise
the measurement start time with the instrument clock.
2.3 Broadband Measurement Mode
In Broadband Mode, the instrument stores the overall values such as L
Aeq
, L
AFmax
and
Ln’s as well as storing a noise profile, or Time History, during each measurement.
The CR:800C instruments can store up to 1,300 Broadband Measurements which can
be of any length, up to a maximum of 99 hours per measurement. With each
measurement is stored a noise profile which consists of 1 second Leq samples, with up
to a maximum of 11 days of Noise Profile being available.
Function
Frequency
Weighting
Displayed
as
Maximum
value
Minimum
value
A
L
AF
L
AFmax
L
AFmin
C
L
CF
L
CFmax
L
CFmin
Sound Level with Fast
Time Weighting
Z
L
ZF
L
ZFmax
L
Zfmin
A
L
AS
L
ASmax
L
ASmin
C
L
CS
L
CSmax
L
CSmin
Sound Level with Slow
Time Weighting
Z
L
ZS
L
ZSmax
L
Zsmin
A
L
AI
L
AImax
L
AImin
C
L
CI
L
CImax
L
CImin
Sound Level with Impulse
Time Weighting
Z
L
ZI
L
ZImax
L
ZImin
A L
Aeqt
- -
C L
Ceqt
- -
Equivalent Continuous
Sound Pressure Level with
integration time t
Z L
Zeqt
- -
A L
AE
- -
C L
CE
- -
Sound Exposure Level
(SEL)
Z L
ZE
- -
Peak Sound Pressure C LCpeak - -
Takt Maximum Sound
Level DIN 45641 (L
AFTeq
)
A LAFTeq - -
A LAIeqt - -
C LCIeqt - -
Impulse Weighted
Equivalent Sounds Press
Level with integration
time t (L
Ieqt
)
Z LZIeqt - -
Please note that only one Frequency Weighting can be selected at any time.
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