Pressure Systems 98RK-1 Integrated Multi-Point Calibration Adjustment, Description, TCP/IP Data

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

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	[w0C01] for CAL pos.
position if this is the desired pressure application input.	[w0C00] for RUN pos.
The RUN position may be a better choice for modules with
transducers having different ranges.
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	ZFFFF 14.98
channels
Place calibration manifold back into the RUN position	w0C00
Store new gain coefficients to transducer nonvolatile	w09
memory
… continue normal data acquisition

4.4Integrated 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-zeroand 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

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