Pressure Systems 9022 Manuel d'utilisateur télécharger pdf (Page 54)

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Measurement Specialties Inc. NetScanner System (9016, 9021, & 9022) User’s Manual

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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.

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Pressure Systems 9022 Manuel d'utilisateur Page 54