Feature: T&M
the IEEE 1588 protocol, and supported by a single soſtware package. Tis ability creates a comprehensive measurement setup that provides a thorough, precise and fast analysis of signals and system behaviour, reducing development times. Tese accurate measurements then lead to improved product performance, lower energy consumption and even less waste. Another good example where power
efficiencies are important are electric vehicles (EVs); see Figure 2. Testing an EV’s efficiency calls for precision measurements of the input from the battery into the motor, as well as the EV’s drivetrain torque and rotation speed. Engineers examine the power characteristics in fine detail, in all operating conditions. For example, precision power analysis of high-speed EV drivetrains entails measurement of high-frequency harmonics, which are a source of losses in an inverter. Harmonic analysis leads to improved efficiencies and, ultimately, a better product. Te Yokogawa WT5000 unit performs
high-frequency harmonic analysis up to the 500th order. Tis instrument can measure harmonics and power simultaneously, and display a comparison of the harmonics from different sources. For high-precision synchronous measurement, the Yokogawa WT5000 power analyzer can be time synchronised with the DLM Series oscilloscope via the IEEE 1588 protocol. Some Yokogawa power analyzers feature a motor evaluation function to enable measurements of motor efficiency, but also rotational speed and direction, synchronous speed, torque, slip mechanical power, electrical angle, and more. Te WT5000 power analyzer has a
modular architecture, and features high isolation and high noise immunity. It is an extensible measurement platform that performs precision power analysis to aid the development of energy-efficient systems.
Correct measurements for sustainability It’s one thing to build energy efficient products, but it is another to know that measurements taken during their development are accurate and correct. Tat means that the T&M equipment should also be checked for any
Figure 1: Power analyzers help cut motor drive losses
potential deviations in measurements. Measurements can driſt over time with the effects of ageing, oxidation, temperature, humidity, and other effects. To verify an instrument operates within its specified tolerance limit, it should be calibrated at regular intervals. Accredited calibration is a method for gaining quantifiable confidence in a measurement system by comparing the instrument’s performance to a standard of known accuracy. Power calibration services maintain
the accuracy and repeatability of testing equipment, but also any other part of the measurement setup on the test bench, such as cables, probes, current sensors, and more. Using precise and accurate energy and power calibration services ensures that designs and instruments meet engineering and quality control requirements, but also allows them to meet regulatory needs for their application and contribute to saving energy. Yokogawa provides an ISO/IEC 17025
accredited power calibration service, calibrating electrical power at DC and AC from 10Hz to 100kHz, thus enabling customers to prove on their ISO certificates that their measurements are correct – even when measuring distorted waveforms. Te accreditation ensures that Yokogawa’s calibration services are traceable to national standards, and technical competence is audited by an independent party, like the national accreditation body. Yokogawa also offers calibration of AC
energy measuring devices to 40MWh at maximum time of 1000 hours, and its calibration lab is one of the few places where instruments can be calibrated in the range of 40Hz-1kHz. Tis service is applicable to renewable energy projects
(photovoltaic, wind installations, etc.), end tests and type rating, but also to accurate billing of electrical energy between supplier and user, for example in the charging of electric vehicles.
Rising to environmental scrutiny Companies today face growing environmental scrutiny that is going to get even tougher. However, many are now turning sustainability into a competitive advantage, proving that profitability is not sacrificed when focusing on sustainability. At the heart of these efforts are accurate, precise and fast instruments and tools, and at Yokogawa we continually innovate such equipment, making it even easier to meet sustainability goals.
Figure 2: Extending EV driving range with the Yokogawa WT5000 instrument
www.electronicsworld.co.uk December 2025/January 2026 41
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