PNI Sensor Corporation
DOC#1014688 r09.2
TCM User Manual
Page 26
Acquire Delay
The Acquire Delay sets the time between samples taken by the module, in seconds.
This is an internal setting that is NOT tied to the time with which the module transmits
data to TCM Studio or the host system. Generally speaking, the Acquire Delay is either
set to 0, in which case the TCM is constantly sampling or set to equal either the Poll
Delay or Sample Delay values. The advantage of running with an Acquire Delay of 0
is that the FIR filter can run with a relatively high Tap value to provide stable and
timely data. The advantage of using a greater Acquire Delay is that power consumption
can be reduced, assuming the Sample or Poll Delay are no less than the Acquire Delay.
Sample Delay
The Sample Delay is relevant when Continuous Mode is selected. It is the time delay,
in seconds, between completion of the TCM sending one set of data and the start of
sending the next sample set. If the delay is set to 0, then the TCM will begin sending
new data as soon as the previous data set has been sent. Note that the inverse of the
Sample Delay is greater than the sample rate, since the Sample Delay does not include
the actual measurement acquisition time. The default is 0.
Flush Filters
Flushing the FIR filter clears all the filter values so it is necessary to fully repopulate
the filter before a good reading can be given. For example, if 32 FIR taps is set, then
32 new samples must be taken to provide a good reading. It is particularly prudent to
flush the filter if the Sample Delay is set to a non-zero value as this will purge old data.
Note that flushing the filters increases the delay until data is output, with the length of
the delay being directly correlated to the number of FIR taps. The default is not to
Flush Filters.
6.3.8
HPR During Calibration
When the <On> button is selected, heading, pitch, and roll will be output on the Calibration
tab during a calibration.
6.3.9
Calibration Settings
Automatic Sampling
When selected, the module will take a sample point once the minimum change and
stability requirements have been satisfied. If the user wants to have more control over
when the point will be taken, then Auto Sampling should be deselected. Once
deselected, the <Take Sample> button on the Calibration tab will be active. Selecting