Lord MicroStrain Sensing SG-Link-200, Руководство пользователя

Страница: 25 / 52

SG-Link®-200
User Manual
25
5.2 Derived Output Channels
There are three derived data channels available for the SG-Link-200. Using these data channels for
trend monitoring allows the ability to extend battery life while reducing data. Each operation is
performed on a window of data from the specified sensor channel, where the window size is equal to
the output period of derived channel. The timestamp associated with each sweep is that of the last data
point collected within that window. The derived data output rate must be at least 32 times slower than
the sample rate. (
See Derived Output Channels on page 25
)
l
Mean is calculated by averaging all of the measurements taken within the window.
l
RMS is calculated by squaring the mean of all measurements taken within the window and
taking the square root.
l
Peak to Peak is calculated by subtracting the smallest value from the window from the
largest value.
5.4 Sampling Operations Options
The three sampling options for the SG-Link-200 are Continuously, Limited or Event Triggered.
Figure 18 - Sampling Operations Menu
l
Continuous - Collect data continuously at the configured sample rate. All data is
transmitted and/or logged to flash memory until a Set to Idle command is received.
l
Limited - Automatically stop sampling and return to Idle mode after the configured time
duration is met.
l
Event Triggered - The node will collect data continuously, but only transmit/log the data if
one of the configured threshold conditions has been met. When the condition is met, all
active sensor channels will transmit/log both pre- and post-event data. This option allows for
longer battery life, reduced data sets, and increased network size.