Pressure Systems 9022 Uživatelský manuál stáhnout pdf (Strana 49)

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

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CONFIGURE/CONTROL MULTI-POINT CALIBRATION (Command ‘C’)

Purpose: This command is actually four (4) sub-commands. The first configures and starts

a Multi-Point Calibration adjustment function for selected channels in the

module. Another is repeated multiple times to collect data for each defined

calibration point. Another ends the calibration function normally by calculating

new offset and gain adjustment coefficients from the collected data. It then

returns the module to its normal state, but with improved accuracy. A final

sub-command is used only if it becomes necessary to abort the calibration

function while in progress. The general form of all sub-commands is described

in the table below. Subsequent pages separately describe each individual

sub-command and give examples of each.

Command

“C ii[ dddd]... ”

‘C’ is the command letter.

‘ ii’ is a required sub-command index preceded by a space character.

‘ dddd’ are zero or more optional datum (or parameter) fields, each preceded by

a space character. These vary with the sub-command used.

Response

Depends upon the particular sub-command (ii) used.

Description: The four ‘C’ sub-commands configure and control operation of a Multi-Point

Calibration function that is similar to the simpler re-zero and span calibration

adjustment functions (see separate ‘h’ and ‘Z’ commands). However, ‘C’ adjusts

both the offset and gain correction coefficients of each affected transducer at the

same time, using two or more calibration points. Thus, instead of simply

calculating a new linear (i.e., straight line) adjustment function that passes

through the supplied zero and span calibration points, it calculates a best-fit

straight line, using the least squares method, that comes “as close as possible” to

all the supplied calibration points. This correction method provides the very

best adjustment throughout the entire range (negative to positive) of a differential

transducer.

This ‘C’ command (with sub-commands) is available only in

modules that have upgraded to firmware Version 2.24 or later.

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Pressure Systems 9022 Uživatelský manuál Strana 49