Somat eDAQ
lite
210
I2773-4.4 en
14.2.1 ELHLS and ELBRG Channel Synchronization
For ELHLS and ELBRG channels, the relative data synchronization across all
channels in any given eDAQ
lite
stack is typically within a few microseconds. All of
these channels use the same type of Butterworth 8-pole analog guard filter, which
produces a delay of around 42 microseconds (±2 microseconds). The eDAQ
lite
compensates for this delay by using a fixed value of 40 microseconds for the 100 kHz
MSR to pre-start digital data sampling and align the digital data as close as possible
to the actual sample rate clock.
Following is a histogram showing a typical distribution of data skews in microseconds
for all EHLS channels and a variety of sample rates. Note that the data skew for all
channels at all sample rates is less than one microsecond, which is typical for both
ELHLS and ELBRG layers in general.
Channel
Sample Rate (Hz)
25000 10000 2500 32768 8192 2048
HLSS_1.c01 0.00 0.00 0.00 0.00 0.00 0.00
HLSS_1.c02 0.37 0.37 0.37 0.37 0.40 0.38
HLSS_1.c03 -0.09 -0.10 -0.05 -0.09 -0.07 -0.06
HLSS_1.c04 -0.08 -0.09 -0.09 -0.09 -0.07 -0.05
HLSS_2.c01 0.11 0.14 0.21 0.10 0.15 0.05
HLSS_2.c02 0.16 0.17 0.19 0.15 0.23 0.16
HLSS_2.c03 0.12 0.14 0.17 0.11 0.16 0.11
HLSS_2.c04 0.31 0.32 0.37 0.30 0.33 0.30
Brg_1.c01 1.65 1.64 1.68 1.60 1.60 1.57
Brg_1.c02 1.55 1.54 1.59 1.50 1.49 1.46
Brg_1.c03 1.42 1.42 1.45 1.38 1.37 1.38
Brg_1.c04 1.57 1.57 1.63 1.52 1.49 1.55
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