
Figure 1: Block diagram
920001
CEL-192 Microphone
30 dB
Gain
A-Wtg
Lin. or
C-Wtg
Freq
Weighting
F
Amplifier
Cal
External Power Supply
Power
Supply
Batteries
Display
A / D
Converter
Micro-
processor
Low
Voltages
Internal
Controls
Battery
Condition
RAM (not
414 or
328/3C)
RMS
Detector
EPROM
Address Bus
Data Bus
Log DC Out
80
P
I
S
C-Wtg
CEL-225/3 Preamplifier
200 V Polarisation Voltage
Interface
(only B, D &
493/3)
To Ext Filter: AC Out
From Ext Filter
(not 266/328)
10 dB Attenuator Pad
(493/3 only)
10 Octave
Filters
CEL-230 Microphon/
Preamplifier Unit
50
20
Range
(only 266/328)
Lin, A-, or
C-Wtd AC Out
30 dB
Gain
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