Inc Scanner User Manual

Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©
Page 106 www.PressureSystems.com
Following is a simple, step-by-step procedure for executing a “specified-value” span calibration
of a Model 9816 Intelligent Pressure Scanner. For the purposes of this example, it will be
assumed that an upscale pressure of 14.9800 psi is available from a dead weight tester for the
calibration of 15 psi internal transducers. All sixteen channels are 15 psi full scale.
Description TCP/IP Data
Insure that valves in RUN/CAL mode (default). [w1200]
… normal data acquisition
Perform Re-zero calibration first see Section. 4.2.2
Place the module calibration manifolds into the CAL
position if this is the desired pressure application input.
The RUN position may be a better choice for modules with
transducers having different ranges.
[w0C01] for CAL pos.
[w0C00] for RUN pos.
With a deadweight tester, apply 14.9800 psi to the
appropriate module CAL and CAL REF inputs [or optionally
to RUN inputs]
Delay for settling of pneumatic inputs
Verify measured data reads near expected full scale. [rFFFF0]
Instruct module to calculate new gain coefficients for all 16
channels
ZFFFF 14.98
Place calibration manifold back into the RUN position w0C00
Store new gain coefficients to transducer nonvolatile
memory
w09
… continue normal data acquisition
4.4 Integrated Multi-Point Calibration Adjustment
NetScanner
™
System Intelligent Pressure Scanners may have their accuracy enhanced by
regular application of one or both of the individual Re-zero and Span calibration adjustment
functions already described in Sections 4.2 and 4.3. For users who have installed scanner
firmware version 2.24 or later, an integrated and more comprehensive Multi-Point Calibration
function may be used instead to adjust the same offset and gain coefficients for a module’s
channels. This function also provides for supplying additional calibration points, which is
particularly useful when it is desired to fit the adjustment data to the entire negative and positive
range of the module. This integrated calibration adjustment function is fully described in this
section. It is implemented by four (4) sub-commands of the 'C' command. Since this function
combines the functions of the Re-zero and Span calibration adjustments (using the 'h' and 'Z'
commands) it is recommended that you read the information of Section 4.2 and 4.3 before
attempting to perform this multi-point calibration.
It is recommended that a Multi-Point Calibration adjustment be performed whenever new
transducers are installed in your module. In such cases, the new zero and gain coefficients that