Introduction to Precision AC DC Difference Measurements
- Start Date : 10 February, 2027
- Start Time : 8:00am
- End Date : 10 February, 2027
- End Time : 5:00pm
- Address : Harbor Rm, N Tower
No Schedule
Abstract
AC-DC Difference metrology is a method of accurately measuring a Root Mean Square (RMS) Alternating Current (AC) waveform at a specific frequency. This measurement is done through the use of special devices known as Thermal Voltage Converters (TVCs) and Multi-Junction Thermal Voltage Converters (MJTVCs), and a comparison to a precision Direct Current (DC) voltage.
This tutorial will cover the history, theory, setup, procedure, and practical applications of precision AC-DC Difference metrology. There will be examples of both AC-DC Voltage and AC-DC Current measurements. The automated AC-DC Difference Major Measurement System at Sandia National Labs will be examined. The class will look at typical uncertainty contributors for AC-DC Measurements. Finally, new quantum-based methods of AC measurements will be examined.
Joshua Stanford
Joshua Stanford is the project lead of the Alternating Current (AC) Laboratory at Sandia National Laboratories' (SNL) Primary Standards Laboratory (PSL). Joshua served 8 years in the US Air Force as an avionics technician on the AC-130U Gunship. After his military service, he used his GI Bill to obtain his bachelors and master's in computer engineering at the University of New Mexico. He interned at the PSL starting his sophomore year until he graduated with his master's where he transitioned to a member of staff. Joshua’s primary focus throughout his career at the PSL has been the modernization and automation of numerous Major Measurement Systems.
Eddit O'Brien
Edward O’Brien is currently the project lead of the Direct Current (DC) Laboratory at Sandia National Laboratories Primary Standards Laboratory and also works in the Alternating Current (AC) Laboratory. In this position, Edward supports measurements throughout Sandia with a focus on primary resistance & voltage, current shunts, pulsed voltage & current, AC-DC Difference, impedance, turns ratio, time and frequency. Edward graduated from SUNY Binghamton with his Master’s degree in Electrical Engineering and was part of the SURF program at NIST during his undergraduate studies. Since 2021, Edward has served as the Central Division Vice President on the NCSL International Board of Directors.