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Pressure Systems 98RK-1 User Manual

Page 46

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Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©

Page 44

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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.

Note

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

modules that have upgraded to firmware Version 2.24 or later.

CommandC 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.


Note

Avoid confusing this Calibrate command 'C' (upper case C) with the
Configure/Control Autonomous Host Streams
command 'c' (lower
case c). Like 'c', but unlike most other module commands, all sub-
commands of this command require a space
between the command
id
('C') and its first parameter (ii).


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