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10.3 FAQs
First of all, let us clarify several terminologies referenced by software engineers.
Data sampling: the process of getting data from Arbin instruments.
Data logging-the process of saving data from real-time buffer to results database file.
Data acquiring-the overall process of data sampling and data logging.
Data sampling and data logging are two independent processes. Data sampling is executed by the MC, and its
rate is determined mainly by the time required to sample all operating channels. Data logging is executed in the
foreground scan loop. Whenever a schedule limit is evaluated, the data will have its chance to be saved to
results file. If the logging data speed is faster than sampling data speed, then there exists a chance of saving
duplicate data.
Normally, customers will mention "acquire data" although for us it stands for two independent processes. So the
question "How fast can MITS Pro acquire data" actually is the combination of two questions: "How fast can
MITS Pro log data" and "How fast can MITS Pro sample data".
a.
How fast can MITS Pro log data?
There is no straightforward formula to calculate the speed. However, we provide an answer based on tests
here. Keep it in mind: if you want very fast logging speed, be sure to set a big enough logging buffer in
system config.
The test environment is: Pentium 400 PC 128MB RAM, a 32-channel system unit, no auxiliary maps
created, an exhaustive logging schedule lasting 50 seconds and assigned to 4 channels, and a relatively
small results file.
Tests with sufficient data buffer
Points per second per system
Test round 1: 118.64(p/s/s)
Test round 2: 116.86(p/s/s)
Test round 3: 116.92(p/s/s)
Final average performance: 118.14(p/s/s)
Milli-seconds per point per system
Test round 1: 8.43(ms/p/s)
Test round 2: 8.56(ms/p/s)
Test round 3: 8.55(ms/p/s)
Final average performance: 8.46(ms/p/s)
Milli-seconds per point per channel (based on 4 running channels)
Test round 1: 33.8(ms/p/c)
Test round 2: 34.2(ms/p/c)
Test round 3: 34.2(ms/p/c)
Final average performance: 33.9(ms/p/c
Tests with insufficient data buffer
Points per second per system
Test round 1: 34.48(p/s/s)
Test round 2: 45.98(p/s/s)
Test round 3: 45.98(p/s/s)
Arbin-002 MITS Pro 3.0-BT2000 User Manual
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