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All Rights Reserved. Copyright © 2000, Yokogawa Electric Corporation
TI 04L01A01-02E
2.4.3
Description of Files
Measurement data file
The following two types of files can be created simultaneously as measurement data files on the DX
Series.
Display data file
: Stores data at a sampling rate in sync with the display update rate
Event file
: Stores data at a specified sampling interval.
Display data file (. DDS)
The display data file stores measured data that are used to display the waveform.
The maximum and minimum values of the data measured at a specified sampling rate over a time
period corresponding to one dot on the time axis are stored as one waveform display data point
(pixeles).
Since data can be stored over a long period at a comparatively slow sampling interval (2 s to 8
minutes), this file corresponds to the conventional chart paper.
Conceptual diagram of the display data file (When the waveform update rate is "30 min/div")
In the example above, the waveform display is updated at a rate of one dot per minute.
The DX102/104/204/208 measures at a maximum speed of 125 ms, thus it is actually making 480
measurements in one minute.
The DX106/112/210/220/230 measures at a maximum speed of 1 s, thus it is actually making 60
measurements in one minute.
The maximum and minimum values of the data measured over the waveform update interval of one
minute are stored in the display data file.
In other words, even if an abrupt change occurs within one minute, the DX series will capture its peak
value.
The relationship between the waveform span rate (the time corresponding to one div on the time axis),
the data saving period is indicated below.
Waveform Span Rate
Data Saving Period
Waveform Display speed (Approx.)
1min/div
2sec
615.0mm/h
2min/div
4sec
307.5mm/h
5min/div
10sec
123.0mm/h
10min/div
20sec
61.5mm/h
20min/div
40sec
30.7mm/h
30min/div
1min
20.5mm/h
1hr/div
2min
10.2mm/h
2hr/div
4min
5.1mm/h
4hr/div
8min
2.5mm/h
Enlarg
ed view
30min. (30 pixels)
1 minute (1 pixel)
Maximum
Minimum
These two values are
stored for each minute
1div