CoCo-80 User Manual
86
Block Size governs the size of transient capture or FFT blocks in the signal
analyzer phase. Block Size has no influence on the length of the time streams in
the data conditioning phase.
Both time streams and block-by-block signals can be displayed with continuous
update (Run mode) or frozen on the screen (Hold mode). In the signal display
window the F6 soft button is assigned to the Run/Hold function. Hold means
the display are frozen on the screen. Hold does not stop the data conditioning
and recording process. If data is being recorded and the Hold button is pressed,
the data will continue to be recorded until the Rec/Stop button is pressed again.
The actual Data Conditioning and Signal Analysis function processing are defined
by a special technology, CSA, as described in the following section.
Acquisition Modes
This section describes the Acquisition Mode, which defines how the device
captures block by block data from continuous time streams, usually in response to
trigger events.
The instrument separates the data processing into three stages: data conditioning,
acquisition mode, and signal analysis. Acquisition Mode controls how the
continuous time stream data is captured for block-by-block processing.
Acquisition Mode control is applied after data conditioning and before the signal
analysis stage. If a CSA does not include a block capture function then
Acquisition Mode will not be used.
Acquisition
Mode
Block-by-
Block
time
signals
Time
streams
Data conditioning Signal analysis
Figure 101. Data processing is separated into three stages.
Note: in the description below, sometimes when we say “capture a block of data”,
it really means that multiple blocks of data are captured from their own time
streams. These blocks are all accurately time-synchronized.
Free Run displays block data acquired from the time stream as fast as possible
or at the overlap rate set by the user. Free Run is commonly used to analyze
random or irregular signals.
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