Omega RD-MV100 Series, Руководство пользователя

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8-7
Data Acquisition and Saving to External Storage Medium
8
Maximum number of data points per channel that can be acquired
The following table shows the maximum number of data points per channel that can be
acquired.
Data being Acquired Maximum Number of Data Points Per Channel
Display data only 1,200,000 bytes/(number of measurement channels
×
4 +
number of computation channels
×
8)
Except, the maximum number of data points is 100,000
Display data and event data • Display data
900,000 bytes/(number of measurement channels
×
4 +
number of computation channels
×
8)
Except, the maximum number of data points is 75,000
• Event data
300,000 bytes/(number of measurement channels
×
2 +
number of computation channels
×
4)
Except, the maximum number of data points is 30,000
Event data only 1,200,000 bytes/(number of measurement channels
×
2 +
number of computation channels
×
4)
Except, the maximum number of data points is 120,000
Sampling length
The sampling length can be derived from the following equation.
Sampling length = the maximum number of data points per channel
×
sampling interval
Calculation example
• Display data only
Measurement channel : 2, computation channel : none
Data Maximum Number of Data Points and Sampling Length
Display data Maximum number of data points = 1,200,000/(2 CH
×
4 bytes + 0
×
8bytes) =
150,000. However, since 100,000 data points is the limit,
Maximum number of data points = 100,000
Display rate When set to 30 min/div (60 s sampling interval)
Sampling length = 100,000 data points
×
60 s = 6,000,000 s (approx. 69 days)
Measurement channel : 12, computation channel : 6
Data Maximum Number of Data Points and Sampling Length
Display data Maximum number of data points = 1,200,000/(12 CH
×
4 bytes + 6
×
8 bytes) =
12,500
Display rate When set to 30 min/div (60 s sampling interval)
Sampling length = 12,500 data points
×
60 s = 750,000 s (approx. 8 days)
• Event data only
Measurement channel : 2, computation channel : None
Data Maximum Number of Data Points and Sampling Length
Display data Maximum number of data points = 1,200,000/(2 CH
×
2 bytes + 0
×
4 bytes) =
300,000
However, since 120,000 data points is the limit,
Maximum number of data points = 120,000
When the event data sampling interval is 1 s
Sampling length = 120,000 data points
×
1 s = 120,000 s (approx. 33 hours)
Measurement channel : 12, computation channel : 6
Data Maximum Number of Data Points and Sampling Length
Event data Maximum number of data points = 1,200,000/(12 CH
×
2 bytes + 6
×
4 bytes) =
25,000
When the event data sampling interval is 1 s
Sampling length = 25,000 data points
×
1 s = 25,000 s (approx. 7 hours)
8.2 Function to Acquire Display Data and Event Data