PUBLICATIONS, WORKSHOPS, SEMINARS & PATENTS

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The following is a list of publications by the principal of AMSC, LLC.

(You can request any paper by email at the bottom of this page.)

 

"Cost and Accessibility of Metrolog, Calibration, Testing and NDT Training”, D. Destefan and W. Hinton, Cal Lab Magazine,

Oct-Nov-Dec 2019, pp 30-37. 

 

“Electrical Load Limitations of Transconductance Amplifiers”, D. E. Destefan, Fluke Calibration Application Note,   4/19/15. 

 

“Electrical Load Limitations of Transconductance Amplifiers”, D. E. Destefan, Blog posted to Fluke Calibration (USA), 11/11/2014. 

 

“To What Extent Can Rogowski Coil Current Amplitude Linearity Be Verified?“,  B. V. Djokic, J. D. Ramboz, and D. E. Destefan, presented at Conference on Precision Electromagnetic Measurements (CPEM),  Daejeon, Korea June 13-18, 2010.  (Also accepted for publication, IEEE I&M Transactions, Special Issue for CPEM papers.) 

 

“Rogowski-Coil Based Systems to Support Utility and Power Industry Current Measurement Needs”, D. Destefan, J. Ramboz, and S. Weiss, invited paper presented at the NCSL International 2007 Annual Workshop and Symposium, July 29 – August 3, 2007, St. Paul, MN.

 

“The Challenges of Achieving Traceable and Accurate High Current Measurements, D. Destefan, J. Ramboz, and R. Stant, invited paper presented at the NCSL International 2005 Annual Workshop and Symposium, August 7-12, 2005, Washington, D.C. 

 

 “Current Feed Point and Torque Sensitivity of High Current dc Shunts,” D. Destefan, R. Stant, and J. Ramboz, NCSL International 2003 Annual Workshop and Symposium, Aug. 17-21, 2003, Tampa, FL. (reserve paper included in proceedings), presented NCSLI 2004 Annual Workshop and Symposium, July 2004.

 

“AC and DC Shunts – Can You Believe Their Specs?”, D. Destefan and J. Ramboz, presented at the  IEEE Instr. and Meas. Conf., Vail, CO May 20-22, 2003. 

 

Specification for Calibration and Performance Testing of Secondary Current Sensing Coils and Weld Current Monitors used in Single Phase AC Resistance Welding,  ANSI/AWS A10.C committee published 2007

 

“Recommended Practices for Gas Tungsten Arc Welding,”  ANSI/AWS C5.5-98 Standard –  published 2004, co-author/contributor.

 

“The Verification of Rogowski Coil Linearity from 200 A to Greater Than 100 kA using Ratio Methods,” J. Ramboz, D. Destefan, R. Stant, presented at IEEE Instr. and Meas. Conf., Anchorage, AK, May 21-23, 2002.

 

“Precision EHV Current Probe and Comparator for Field CT/OCT Verification and Line Monitoring,”  A. Andersson,  D. Destefan, J. Ramboz , and S. Weiss, invited paper presented at 3rd EPRI Optical Sensor Systems Workshop,  Pittsburgh, PA, October 17-19, 2001. 

 

“Unique EHV Current Probe for Calibration and Monitoring,” A. Andersson, J. DeHaan, D. Destefan, J. Ramboz and S. Weiss, presented at the IEEE Transmission and Distribution Conf., Atlanta, GA, Oct, 28, 2001 – Nov. 2, 2001.  

 

 “Advancements in High Current Measurement and Calibration,” D. Destefan and J. Ramboz, Presented at NCSL International 2000 Workshop and Symposium July 16-20, 2000, Toronto, Canada.

 

“Performance Assessment of Current Sensing Coils Built into Resistance Welding Transformers,”  Kendall Ymker1, D. E. Destefan, and J. D. Ramboz  presented at the International Sheet Metal Welding Conf, Detroit MI October 19, 2000.

 

“Unrecognized Errors in the Calibration of Current Coils,” V. Ananthananryanan, M. Karagoulis, B. Kelly, D. Destefan, J. Ramboz, D. Kelly, presented at the Sheet Metal Welding Conf., Detroit, MI, Oct. 14-16, 1998.   

 

“Uncertainty Analysis for High-Current Measurements,”  D. Destefan, J. Ramboz, presented/published at Natl. Conf. of Stand. Lab. Workshop and Symposium, July 19-23, 1998, Albuquerque, NM. 

 

“Establishment of Traceability for Pulsed-Current Measurements to Greater than 60 kA,”    J. Ramboz, D. Destefan, presented/published at Natl. Conf. of Stand. Lab. Workshop and Symposium, July 19-23, 1998, Albuquerque, NM.   

 

“High-current Calibration Facility for Resistance Welding Current Monitors,” D. Destefan, IEEE Trans. Of Instrum. and Meas., Sept., 1996.   

 

“Basics to Know When Choosing a GTAW Power Source,” Welding Journal, pp 67-72, Jan. 1995, article contributor.

 

“Mathematical Modeling of Part Voltage and Weld Current in Resistance Welding,” D. E. Destefan, EG&G Publication, RFP-4218, Sept 11, 1990.  

 

“RMS and Average Errors Resulting from Low Pass Filter Characteristics in Instrumentation Systems,” D. Destefan, presented at IEEE Instrum. and Meas. Conf., Washington, DC, April 26, 1989.

 

“1000 Amp AC/DC Current Source for the Calibration of Welding Systems,” D. Destefan, presented at IEEE Instrum. & Meas. Conf., Boulder, CO, Mar 22, 1986.   

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SEMINARS AND WORKSHOPS

Seminars

High Current Sensors, Measurement Methods, Calibrations, Uncertainties, and Traceability, seminar developed and presented with J. Ramboz, Boulder, CO, March 21-23, 2006.

 

High Current Sensors, Standards, and Calibration Methods, seminar modified for and presented at Westinghouse Savanah River Site, with J. Ramboz, Aiken, SC, October 26-28, 2005.

 

High Current Sensors, Measurement Methods, Calibrations, Uncertainties, and Traceability, seminar developed and presented with J. Ramboz, Boulder, CO  October 18-20, 2004.

 

High Current Sensors, Measurement Methods, Calibrations, Uncertainties, and Traceability, seminar developed and presented with J. Ramboz at Sandia National Laboratories, Albuquerque, NM, August 11-13, 2002.

 

Workshops

“Resistance Welding Current Calibration: An Update,” D. Destefan, J. Ramboz, workshop conducted at the American Welding Society International Welding and Fabrication Convention, Chicago, IL, April 22, 1996.

 

“Advances in Resistance Welding High-current Measurements,” D. Destefan, J. Ramboz, workshop conducted at the American Welding Society International Welding and Fabrication Convention, Cleveland, OH, April 3, 1995.

(Materials are only available to attendees. Included for completeness and for reference.)

 

PATENTS AND INVENTIONS

“Pre-resistance-welding Resistance Check,” U. S. Patent 5,021,625.

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