05 May 2016   |   2 days, 9am to 5pm,   National Metrology Centre, 1 Science Park Drive, Singapore 118221

Digital Multimeters and Their Calibration

This course covers the principles and techniques in the calibration of digital multimeter. The participants will learn how to develop general calibration procedure for multimeters using a multifunction calibrator, and understand practical issues such as the impact of grounding, interference, temperature, loading, cable and connectors that affect the accuracy of measurements, how to estimate the measurement uncertainty for the calibration of multimeters, and preparation of calibration reports.

Course Trainer

Dr. Chua Sze Wey is a Principal Metrologist  in the Electrical Metrology Lab of the National Metrology Centre (NMC), A*STAR. His main area of expertise is in the field of dc and low frequency electrical metrology. He has been involved in the development, maintenance, and dissemination of electrical measurement standards for more than 25 years. Apart from metrology related work, He is also involved in accreditation and standardisation activities, and has been a technical assessor for the Singapore Accreditation Council‐Singapore Laboratory Accreditation Scheme (SAC‐SINGLAS) since 1992.


Course Content

Fundamental of electrical metrology

  • Vocabulary and concepts of metrology
  • Measurement standards and traceability
  • Introduction to measurement uncertainty

Principles of electrical measurements

  • Digital multimeter (DMM) and calibrator
  • Measurement of voltage, current and resistance
  • Source of errors
  • Cables, connectors, and accessories
  • Understand the specifications and equipment selection

Calibration of digital multimeter

  • General DMM calibration requirements
  • Accuracy ratio and compliance to specifications
  • Development of a general DMM calibration procedure
  • Estimation of measurement uncertainty and Calibration and Measurement Capabilities (CMC)
  • Reporting calibration results
  • Practical exercises

For Whom

The training is intended for technical staff involved in electrical calibration and measurement work. Some knowledge on basic electrical engineering is needed to attend the training. 



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