App-2 IM 04L20A01-01E
Internal Memory Capacity
The capacity of the internal memory that is used for data storage is 1.2 MB. The
internal memory is allocated depending on the acquired data as follows.
Data being acquired Internal Memory Capacity
Display data only 1.2 MB
Display data and event data Display data: 0.9 MB
Event data: 0.3 MB
Event data only 1.2 MB
Maximum Sampling Length
The maximum sampling length is the time duration that the data storage area in the
internal memory becomes full. The maximum sampling length can be derived from
the following equation.
Maximum sampling length = maximum number of data points per channel ×
sampling interval
• Maximum number of data points per channel that can be acquired
When the type of data to be written to the internal memory, and the number of
measurement and computation channels are decided, the maximum number of data
that can be written is calculated. This is called the maximum number of data points
per channel (hereafter, max data no.).
The max data no. is calculated using the equation in the table below.
Data being acquired Max data no.
Display data only 1,200,000 bytes/(number of measurement channels × 4 + number
of computation channels × 8)
Except, the max data no. 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 max data no. is 30,000
Event data only 1,200,000 bytes/(number of measurement channels × 2 + number
of computation channels × 4)
Except, the max data no. is 120,000
Note
To estimate the maximum sampling length, use the table showing the maximum number of
data points per channel on pages App-4 and App-5.
Appendix 1 Time Estimate for Writing Display/Event Data to the Internal Memory
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