Measurement Specialties 9116 User Manual

Pressure Systems, Inc.                                                                                        Model 9116 User’s Manual 
 
 

 

Page 31 

 

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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. 
 

“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.

 

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

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

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  

all the supplied calibration points.  This correction method  

 

 

  provides the very best adjustment throughout the entire range (negative to  

 

 

  positive) of a differential transducer. 

 
 
 
 

 

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 the first parameter (ii).