Pressure Systems 9022 - Manual (Page 51)

Pressure Systems, Inc. NetScanner™ System (9016, 9021, & 9022) User’s Manual
www.PressureSystems.com 3 - 21
Command ‘C’— Sub-command Index 02: Calculate & Apply Correction Coefficients
This sub-command has no additional parameters.
Command “C 02”
‘C’ is the command letter.
‘ 02’ is the sub-command index (ii) for Calculate & Apply
NOTE: all parameters are separated by a space.
Response “A”
‘A’ is the acknowledge letter — returned if the required number of
calibration data points had their data successfully collected previously,
and the resulting calculated data is reasonable. Else, an error (‘N’)
response is returned.
Description: This sub-command finishes the Multi-Point Calibration function, previously
started by the Configure & Start (‘00’) sub-command. It calculates new correction
coefficients using the pressure data collected by all required executions of the
Collect Data (‘01’) sub-command.
All the averaged data points collected previously are checked for reasonableness,
and then a new set of zero and gain correction coefficients are calculated by the
least-squares method for each channel (transducer) affected by the calibration.
These are stored in the module’s volatile memory for use by all subsequent EU data
conversion of these channels until the module is reset or powered off. These
coefficients may be stored in the non-volatile memory of the module’s transducers
with the ‘w’ command (see indexes 08 and 09 for that command). The latest
calculated zero and gain coefficients may be inspected with the ‘u’ command at any
time for any channel.
Finally, this sub-command restores the original “A/D samples for averaging” count
used by the module’s data acquisition process to the value that was in use before the
Multi-Point Calibration function was originally started.