Editor’s choice

the neXt generation oF Precision PoWer analYser

The new Yokogawa WT5000 is the first of a new generation of precision power analyser that offers measurement accuracy of ± 0.03 per cent combined with stability, noise immunity and plug-in modular flexibility to meet the measurement needs of today’s developers of energy-efficient systems. In rapidly evolving industry sectors like electric vehicles, renewable energy

and energy efficient technologies, the need for reliability in testing to enhance safety, efficiency and performance has never been greater. Changing application needs and evolving international standards call for custom measurements and consistent accuracy, and in the WT5000, engineers have a versatile platform that not only delivers reliable measurements today, but is ready for the challenges of tomorrow. The WT5000 achieves the highest measuring accuracy: ±0.03 per cent of

total at 50/60 Hz. As a result, it has become possible to evaluate the power consumption, loss, and efficiency of electrical and electronic devices. In particular, its wide dynamic current range is indispensable for tests on energy- saving designs. One of the essential

elements for determining the performance of a power measuring instrument is the A/D converter that performs analogue-to-digital conversion. In order to obtain the world’s highest measurement accuracy, the WT5000 uses an 18- bit converter with a

sampling frequency of maximum 10 MS/s. As a result, it becomes possible to accurately capture waveforms from the latest high-speed inverter devices. It is very effective for stable measurement results. While the WT5000 has the same dimensions as existing models in

Yokogawa’s WT series, it incorporates up to seven input channels, allowing it to support applications that previously could only have been measured by synchronising several separate instruments. As a result, it offers considerable savings in installation space, communications overheads and cost-effectiveness. Further benefits result from the use of plug-in modular input elements, which can be swapped directly by the user. The 30 A and 5 A elements, for example, can be switched for applications

involving electric vehicles or fuel-cell vehicles, where developers are increasingly required to evaluate a number of different motors. Using the WT5000 equipped with the /MTR1 and /MTR2 options, it is possible to evaluate up to four motors simultaneously with one unit. Since these options allow the input of four channels, flexible measurement of the A, B, C and Z phases of each motor can be carried out. With a seven elements input capability, multi-system measurement is

increased in harmonic measurements on three-phase systems, for example. The WT5000 can carry out two harmonic measurement functions simultaneously, each at up to the 500th order and up to 300kHz fundamental waveform. This makes it possible to measure the carrier frequency component from the rotational speed of the motor in the inverter drive and also to check the influence of the carrier frequency on the motor drive. An increasing number of applications require the evaluation of larger-

current devices, typical examples being electric vehicles and large-scale solar installations. In these cases, external current sensors are often used. An external current sensor input function is fitted as standard in the input element of both the 30 A and 5 A input elements of the WT5000. For much higher currents (up to 2,000 A RMS) dedicated high-current sensors are available. Yokogawa AC/DC current sensor CT series is current output type in order to prevent noise influence.

Yokogawa 10

measuring material going under shear

Specialised Imaging has reported how its Kirana ultra-high-speed video camera has been used by a leading material science laboratory to measure the movement of an aluminium sample undergoing adiabatic shear along a 2mm shear region. The movement in the aluminium test piece was measured using Digital

Image Correlation (DiC) software. The shear impulse was imparted onto the specimen using a Split Hopkinson Bar experimental set up. The presented DiC data shows from the first image, a shear band of

heightened strain occurs at approximately 45° to normal. As the specimen begins to ‘slide’ relative to itself, pure shear is induced, starting from the outside edges and converging in the centre. In this adiabatic shear test, the Kirana camera was able to capture high quality images showing how the strain localises along precise shear bands. This occurs due to high-strain rate loading giving rise to localised heat concentrations which do not have time to conduct in the bulk material. This high temperature ‘band’ deforms far more readily than the cooler bulk material. As the test proceeded, cracks appeared on the sample surface. The

process of crack formation and propagation from the outside edge of the specimen moving horizontally through the centre of the shear region was also captured using the Kirana ultra-high-speed video camera.

Specialised Imaging

calibration training services

Transmille offers a variety of training services to ensure that all of its customers are able to use its instruments and products to the best of their ability. One of the most popular types of training is offered at the company’s

head office in Staplehurst, Kent. This grants customers the opportunity to visit Transmille’s office and laboratory and provides guaranteed availability of multimeters, clamp meters and insulation testers along with other devices which can also be used during the training. Alternatively, the company offers on-site training. These on-site training

services are offered globally and are ideal for larger customers. Both on-site training and training at Transmille provide a first-hand

experience with the company’s products and ProCal Software with a metrology expert at your side. All training courses come complete with follow up support and training certificates which can be used as training logs for your quality system.

Transmille November 2018 Instrumentation Monthly

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