Casella-cel CEL-393 Instrukcja Użytkownika Strona 6

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on the main digital display. In addition, the computer is continually
sampling this level every 15ms, and the data is used to calculate the
noise rating parameters.
These parameters are the L
eq
,L
Tm3
,L
Tm5
,L
max
and three L
n
values.
The statistical L
n
parameters calculated are normally L
10
,L
50
and L
90
,
however, alternative values are available on option. They are described
in Chapter 2 of this handbook.
The computed results are available throughout the current period along
with the SPL, and are continually updated and therefore always correct.
A comprehensive memory facility for these results is also provided and
this operates in four distinct modes. The memory modes provided are:
890009
Internal Data Bus
RAM
Pro-
cessor
ROM
Digital
Interface
CEL-160
Level
Recorder
Overload
Control
Logic
Display
Display
Driver
Oct/
1
/
3
Oct
Filter
Operator
Control
Matrix
Operator
Control
Matrix
Level
Recorder
Interface
Power
Supply
Intl/Extl
CEL-238
Sec'dary
Pr'ssor
DA
Log DC Output
A-Wgt
FP IS
Range
Control
System
Conditioned AC Output
RMS
Optional
CEL-2942A/5
Cable
CEL-299
Preamplifier
CEL-186
Microphone
Optional
CEL-2962
Windshield
Optional
CEL-3025
Vibration Kit
Figure 1 Block diagram of CEL-393B
/2.
393 Handbook
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