Measurement Specialties 9116 - Manual (Page 45)

Pressure Systems, Inc. Model 9116 User’s Manual
Page 36 www.PressureSystems.com
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.