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PMM Automated Calibration: In-Chassis Method

This tutorial addresses how to automate the calibration and adjustment of the Fluke Calibration Pressure Measurement Modules (“PMM”) while they remain in the chassis of a 6270A, 8270A, or 8370A.  It is important to distinguish that the chassis to be calibrated cannot be the same device as the AutoGEN controller.  If this is desired, then please read this article for a simplified approach to calibrating a PMM. 



The automation scheme is nearly identical to that of the PMM calibration when used with the Cal Sled accessory.  Like the Cal Sled concept, the In-Chassis calibration provides a fully automated process beginning with identifying the PMM to be calibrated, collecting As-Found data, making a correction based on the A/F data, and then completing the process with an As-Left verification data set.   There is an optional guard banding assessment which can be used to determine final acceptance of the results.  The In-Chassis calibration is applicable to all PMMs regardless of type (PM200 / PM500 / PM600) or pressure range.


The following items are available for download:

  • A PDF copy of the tutorial which includes step-by-step instructions for configuring device definitions, COMPASS Options, and the VB Script code for the macros.
  • A COMPASS "compsetp" data base with the example device definitions, a test definition, and the macros required for the automation.
  • An example COMPASS Report Editor template which combines both the A/F and A/L data sets into a single report.

A tutorial for curve fitting concepts and the basic math behind the adjustments used in these macros can be found here:  Curve Fitting 101

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