WSDA
®
-Base-104
®
USB Base Station
User Manual
System Operation Overview
16
3.6
Sampling Settings
Depending on the type of node, up to four sampling modes are available: Synchronized
Sampling, Low Duty Cycle, Streaming, and Datalogging. Some modes have user-
configurable settings for sample rate, sample duration, and datalogging. Other settings are
automatic, depending on number of active channels and other variables. For more
information on sampling modes refer to the Node Commander
®
user manual (
).
NOTE
Streaming mode (which enables continuous sampling and transmitting) uses a
large amount of system bandwidth and can significantly reduce node battery
life. Streaming is recommended primarily for diagnostics and is not supported in
SensorCloud™.
In general, when determining which sample mode and rate is most suitable for the
application, consider the following:
l
Increasing the sample rate reduces the available over-the-air transmission bandwidth
and therefore also reduces the number of nodes that can be reporting
simultaneously.
l
Increasing the sample rate increases the power requirement of the node and
therefore reduces battery life.
l
When measuring vibration or other analog signals, it is important to use a sample rate
at least twice the value of the target measurement frequency. This is the minimum
sample rate required to produce an accurate digital representation of the measured
signal. The higher the sample rate the more accurate the digital representation.
Sampling settings are accessed through the Configure Node menu. There is a tab for each
sampling mode available for the particular node (
Figure 9 - Sample Settings Menu
).
