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All Rights Reserved. Copyright © 2000, Yokogawa Electric Corporation
TI 04L01A01-02E
2.4.5
Sampling Time
The sampling time (maximum recording period) depends on the number of measurement and computation
channels and the file combination.(Refer to the examples of the sampling time in the appendix)
Internal memory capacity
The capacity of the internal memory is defined according to the file combination as follows.
Display data only
: Memory capacity = 1.2 Mbytes
Event file only
: Memory capacity = 1.2 Mbytes
Display data file + Event file
: Memory capacity = 900 Kbytes (display data file)
Memory capacity = 300 Kbytes (event file)
Data size
The data size of one sample per channel is as follows.
Display data
Measurement data = 4 bytes/channel
Computation data = 8 bytes/channel
Event data
Measurement data = 2 bytes/channel
Computation data = 4 bytes/channel
Data capacity
The data capacity of one sample is expressed by the following equation.
Display data capacity = Number of measurement channels
×
4 bytes
+
number of computation channels
×
8 bytes
Event data capacity = Number of measurement channels
×
2 bytes
+
number of computation channels
×
4 bytes
Maximum number of data points
The maximum number of data points that can be recorded in the internal memory is expressed by the
following equation.
Maximum number of data points = Internal memory capacity/data capacity of one sample
Display data only
Display data
:Maximum number of data points = 1.2 Mbytes / (number of measurement channels
×
4 bytes
+
number of computation channels
×
8 bytes) …1
However, 100,000 data points maximum.
Event file only
Event data
:Maximum number of data points = 1.2 Mbytes / (number of measurement channels
×
2 bytes
+
number of computation channels
×
4 bytes) …2
However, 120,000 data points maximum.
Display data
+
+
+
+
Event file
Display data
:Maximum number of data points = 900 Kbyte / (number of measurement channels
×
4 bytes
+
number of computation channels
×
8 bytes) …3
However, 75,000 data points maximum.
Event data
:Maximum number of data points = 300 Kbytes / (number of measurement channels
×
2 bytes
+
number of computation channels
×
4 bytes) …4
However, 30,000 data points maximum.
Sampling Time
Sampling period (maximum recording period) is determined from the following equation.
Sampling period = Maximum number of data points
×
sampling interval …5