Lord MicroStrain G-Link-200, User Manual

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G-Link
®
-200
User Manual
28
Firmware < 10.36231
The RMS of the IPS is calculated by accumulating the mean of the squares of the integral of the
chunk, dividing by the number of chunks in the window, taking the square root, and multiplying by
386.2197 to convert from Gs to in/sec
2
.
Name Description
F
Window of sampled data
F
j
Chunk of sampled data
J
Number of chunks in the window
K
Number of samples in the window
N
Number of samples in the chunk
Table 5 -
Derived Channel Variables
i. Windows
When performing a derived calculation on sampled data a window is used to provide a rate to
transmit derived calculations and a range of time to derive from. The length of a window in time is a
single period of the derived rate and is given the timestamp of the first sample of the next window.
Given a sample with a timestamp of
t
and a derived period of
p,
the timestamp of the derived
window it belongs to is defined below.
l
Burst Mode - when the node is bursting, the window covers the entire burst instead of the
derived rate. Given a sample with a timestamp of
t ,
a burst period of
p,
and a burst duration
of
d
, the timestamp of the derived window it belongs to is defined below.