Stanford Research Systems www.thinksrs.com-IG1calapp free download

File name www.thinksrs.com-IG1calapp.pdf

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