CoCo-80 User Manual
84
To initiate the CSA Editor, click on the CSA Editor icon on the upper-left corner of
EDM.
Signal Processing in the CoCo
In a global picture, the signals will go through the following stages in the analyzer:
CoCo
Analog
Signal
Conditioning
A/D
Converter
(Optional)
High-Pass Filter
and Integration
Data
Conditioning
Spectral
Analysis
First the analog signals will be processed by the analog signal conditioning
circuitry. It usually includes input mode selection logic, the high-pass filter for AC
coupling and constant current source for IEPE. Then the analog signals will be
digitized simultaneously by multiple A/D converters. The digital signals coming
out of A/D converters, after a calibration process, will be fed into the DSP
processor.
The CoCo may first turn on a pre data conditioning algorithm. This pre-data
conditioning algorithm may apply the high-pass filters so to reduce the DC drift,
or convert the acceleration signals into velocity or displacement. It will also apply
the appropriate engineering unit setting to the input signals.
Then the data streams will be fed into a user controlled Data Conditioning
module, and then spectral analysis. This part will be explained in detail in the next
section.
The Data Processing Flow of CoCo
CoCo-80 combines two instruments, a data recorder, and a signal analyzer into
one system. It is important to understand the differences between these two
functions. The following sections provide details of each.
The data conditioning and recording phase includes processing the data from
native acquisition channels and data conditioning. Data conditioning operations
include arithmetic operations such as adding or subtracting, filtering, integration,
differentiation, calibration and other operations that can be applied to the
continuous time streams. All the signals in the data conditioning and recording
stage are continuous time streams with a fixed sampling rate without any gaps.
Time streams can be displayed or recorded.
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