Appendix A. Filter Bandwidth and Time Delay
A-2
best synchronicity, choose a datalogger scan interval that, when multiplied by
an integer, equals the EC100 filter delay.
Because the time delay for the 12.5 Hz bandwidth filter is a prime
number, EC100 measurements with this bandwidth cannot be
synchronized as well as other bandwidths. For this reason, the 12.5
Hz bandwidth should be avoided if other fast measurements are
being made by the datalogger and will need to be synchronized
with the EC100 measurements.
The EC100 measures the gas and wind data at 60 Hz, and the 60-Hz data are
down-sampled to the datalogger’s scan rate through SDM communications (see
(p. 31)
). This process synchronizes the EC100 gas and
wind data with other signals measured by the datalogger to within ±8.33 ms
(plus or minus one-half of the inverse of 60 Hz). Alternatively, when sending
data to a non-Campbell data acquisition system, the EC100 down-samples its
USB and RS-485 outputs to a user-selectable rate of 10, 20, or 60 Hz.
Although the gas and wind data from the EC100 remain synchronized with one
another, the user must consider the down-sampled output interval when
synchronizing the EC100 data with other measurements in their system. Slower
output intervals will increase the asynchronicity of EC100 data with other
system measurements.
FIGURE A-1. Frequency and amplitude response of the EC100 filter at
various bandwidths
NOTE
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