Measurement Specialties 9116 Manual Do Utilizador

Pressure Systems, Inc.                                                                                        Model 9116 User’s Manual 
 
 

 

Page 100 

 

www.PressureSystems.com 

 

Verify that pressure reads correctly. 

[rFFFF0] 

When the data are stable, enter another Collect Data 
(‘01’) sub-command of ‘C’ specifying this second 
calibration point (2) with 5.0 psi pressure. 

 C 01  2  5.0 

Apply 3rd calibration pressure to the module’s CAL or 
RUN inputs.  A mid-scale negative  (-2.5 psi)  point is 
assumed in this case.  A vacuum pump is normally 
required to achieve such a pressure with 903x calibrators. 

 

Verify that measured pressure reads correctly. 

[rFFFF0] 

When the data are stable, enter last Collect Data (‘01’) 
sub-command of ‘C’ for this point (3) with a negative 
(-2.5 psi) pressure. 

 C 01 3  -2.5 

Now that data have been collected for every point 
originally specified, calculate and apply the new coefficient 
data with a Calculate and Apply (‘02’) sub-command of 
‘C’.  This also restores the module to using its original 
averaging parameters that existed before the first ‘C’ 
command. 

C 02  

Place calibration manifold back into the RUN position, if 
the CAL position was used. 

[w0C00] 

Store new offset and gain coefficients into transducer non-
volatile memory. 

w08 
w09 

… continue normal data acquisition. 

 

 

Coefficient Storage  

 
The various calibration functions described in Sections 4.2 through 4.4 update the active offset 
and gain coefficients, respectively, in the module’s volatile main memory (RAM) only.  These 
newer calibration coefficients will be lost when instrument power is turned off.  The Set/Do 
Operating Options (‘w’) command may be used to also store these coefficients back in each 
transducer’s nonvolatile memory.  This command’s option index = 08 will store new offset 
coefficients, while its option index = 09 will store new gain coefficients. 
 
A user may read (and should verify) any new offset and/or gain coefficients after performing 
each calibration adjustment command (i.e., by saving coefficient data returned in a command  
‘h’ or ‘Z’  response), or the Read Internal Coefficients (‘u’) command may be used to read 
them any time after calibration adjustment commands have been performed (see coefficient 
indexes cc=00 and 01 for arrays aa=01 through 10).  These “adjusted” coefficients may be 
verified, and then saved by storing them in each transducer’s non-volatile memory with the ‘w’ 
command described above.