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www.thinkSRS.com                                                                                           1



SRS Bayard-Alpert Gauge Calibration
Service

Stanford Research Systems has established a High Vacuum Calibration Facility to generate
high-accuracy, NIST-traceable, full-range calibrations for any new BAG operated with an SRS IGC100
controller. Two accuracy levels are available: a 6% accuracy full-range calibration and a high-precision
3% accuracy full-range calibration.

All calibration information generated at the SRS High Vacuum Calibration Facility is returned to the user
in a 'memory card' that can be used to transfer the calibration data, including all necessary instrument
setup information, into any IGC100 controller. With the calibration data transferred into the controller,
any IGC100 can accurately measure and display unknown pressures in real time over the entire useful
range of the BAG.


In This Application Note
Introduction                                   3
   Sensitivity Factor                           3
   Full-range calibration                       4

Who Needs to Calibrate a BAG?                  5
Calibration Storage in the IGC100              6
SRS High Vacuum
  Calibration Facility                         7
Calibration at a
  Standards Laboratory                        10
Important Terms                               12
References                                    13




(408)744-9040                                                              Stanford Research Systems
www.thinkSRS.com
2   SRS Bayard-Alpert Gauge Calibration Service




    Stanford Research Systems                          (408)744-9040
                                                  www.thinkSRS.com
                                   SRS Bayard-Alpert Gauge Calibration Service                       3



Introduction
          The calculation of pressure with a Bayard-Alpert gauge (BAG) relies on the knowledge
          of the gauge sensitivity factor, Sg, which is strongly dependent on (1) gauge geometry,
          (2) gas type and, to a lesser extent, (3) pressure and (4) emission current1. Once the
          sensitivity factor is known, the pressure, P, is calculated from the simple mathematical
          expression:

                   P = [ Ic / (Sg 

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