ACR Electronics SmartReader Plus Manual de usuario descargar pdf (Pagina 188)

TrendReader Standard 2

177

2005 ACR Systems Inc.

11.5 How Accurate are theTime Measurements?

There are two answers to this question. The first answer describes the relative accuracy of

each reading. The second answer describes the absolute accuracy of the readings.

Relative accuracy

The relative time measurements in normal mode (the time that elapses between one reading

and the next reading) are precise to within

2 * sample rate / 24 * 3600. The accuracy of the

clock inside the logger is

2 seconds per day.

Absolute accuracy

TrendReader Standard 2

absolute time accuracy (the difference between the time the data

logger took a reading and the time that

TrendReader Standard 2

reports the reading was

taken) depends on the time base in the logger. The absolute time of the readings are accurate

to within

4 seconds.

When you back up your data, the logger is unable to tell

TrendReader Standard 2

precisely

when it stored its last reading.

TrendReader Standard 2

only knows the current time and the

elapsed time in 8-seconds intervals.

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ACR Electronics SmartReader Plus Manual de usuario Pagina 188