An introduction to DC voltage calibration and test equipment measurement

When calibrating electrical test equipment, there are a number of specific parameters that need to be tested to ensure the accuracy and safety of devices. DC voltage is one of these parameters that needs to be inline with national and international standards to meet customer expectations of quality. 

But what exactly are the standards for DC voltage calibration, and how do they influence the safety, quality and performance of electrical equipment? 

Understanding DC voltage calibration

DC (direct current) voltage calibration is the process of verifying and adjusting the accuracy of instruments that measure DC voltage. This includes multimeters, voltmeters and other specialised electrical testing equipment. These devices are often fundamental in the research and development, manufacturing and maintenance of electronics in a range of industries like automotive and aerospace.

Why is DC voltage calibration necessary?

DC voltage calibration is essential for maintaining the accuracy, safety and compliance of electrical testing equipment. Over time, factors like component ageing, environmental conditions and operational wear and tear can cause measurement drift, reducing the accuracy of instruments. Regular calibration ensures these instruments remain reliable and accurate when needed. 

Improper calibration can pose safety risks, including electric shocks and operational errors in machinery, making calibration a regulatory requirement to minimise hazards. To ensure safety and manufacturing quality, industries are governed by stringent standards that mandate regular calibration to ensure equipment meets quality specifications. Key standards for DC voltage calibration include ISO/IEC 17025, ISO 9001:2015, and ANSI/NCSL Z540.3, which set requirements for the competence of testing and calibration laboratories and include specifics about calibration methods.

The calibration process for DC voltage

Preparation and setup: The instrument under test (IUT) is prepared and connected to a calibration setup in a controlled environment. This setup includes a reference standard that provides a known voltage output, often a voltage calibrator or a digital multimeter (DMM). 

Measurement, comparison and adjustment: The voltage output from the reference standard is measured by the IUT. These readings are compared to the known values provided by the standard. If discrepancies are found between the IUT and the reference standard, adjustments are made to the IUT to align its readings with the standard. 

Documentation: A calibration certificate is then issued that documents the procedure and results. This certificate provides the traceability, accuracy and reliability of the instrument post-calibration. Additionally, this documentation provides the next interval that it needs to be DC voltage calibrated. 

The value of an accredited laboratory for DC voltage calibration 

In industries that focus on precision engineering, even the slightest discrepancies in DC measurement equipment can lead to consequences in safety and manufacturing quality. This is where UKAS accredited laboratories become invaluable. These are facilities that are recognised for their commitment to the gold standard of calibration, showcasing complete accuracy, precision and reliability. 

In relation to DC voltage calibration, UKAS laboratories have controlled environments to prevent the potential impact of humidity and temperature on readings. They also provide precise methods for specific measuring instruments. For example, a multifunction calibrator can be used to achieve precise DC voltage measurements. For equipment that operates at higher voltages, a voltage divide can be used to scale them down and maintain measurement accuracy. All in all, UKAS laboratories provide a thorough and precise DC calibration process that covers all aspects to ensure complete accuracy.  

Get industry-leading DC voltage calibration with DM

Regular calibration of DC voltage measuring equipment is essential for maintaining the integrity and functionality of electronic systems. By adhering to strict calibration protocols and standards, you can ensure that your equipment performs safely and effectively, meeting both consumer expectations and regulatory requirements. 

DM Calibration offers comprehensive UKAS-accredited services for all electrical calibration needs. We stand ready to ensure your equipment meets all necessary standards with precision, accuracy and convenience. To learn more about our calibration capabilities and how we can assist with your specific needs, please contact us today.