Called WT1800R, the new version can take simultaneous 16bit measurements on up to six inputs at 2Msample/s (right, with optional PD2 on top).
For field-oriented controlled permanent magnet synchronous motors, the instrument can calculate dq-axis parameters Ld and Lq, and record Vd, Vq, Id and Iq.
Its 8.4inch XGA display allows split-screen viewing up to six waveforms and can display up to 12 pages of measurement parameters.
Connections are from the rear (photo left), where up to six measurement units can be slid in – there are two types: rated at 5A or 50A. The exact model number varies with how many measurement units are installed, and their 5A-50A mix.
“The ability to have the unit equipped with both 5A and 50A input elements enables engineers to use a single WT1800R for multiple applications such as stand-by power measurement and the evaluation of various operating modes of the device under test,” according to the company. “The unit can display measurements in vector format or trended over time.”
External current clamps are supported by PD2, an optional six-output clamp power supply that mounts on top of the instrument.
Two options are available for analysing harmonics: a harmonic measurement mode for fundamental wave, harmonic components, and total harmonic distortion, and a dual version for side-by-side harmonics measurement of two different sources – the input and output of variable speed motor drive, for example.
The instrument “guarantees a power accuracy of 0.05% of reading plus 0.05% of range and is capable of harmonics analysis up to the 500th order of a 50/60 Hz fundamental frequency”, said Yokogawa. “Basic ac power measurement accuracy is guaranteed between 1% to 110% of the selected voltage and current range, which equates to voltages from 15mV to 1,100Vrms, and currents from 0.1mA to 5.5Arms for a 5A input, and 10mA to 55Arms for a 50A input. The unit is accurate during large phase shifts and high frequencies from the power factor error of ±0.07% of apparent power.”
Dimensions are: 426mm wide (plus handles), 117mm tall (plus feet, plus 44mm with PD2) and ~500mm deep (without connected cables).
Use is foreseen in the development of electric vehicle power-trains and chargers, renewable energy inverters, uninterruptable power supplies and dc-dc converters.
Find the WT1800R on this web page. For more, this document includes detailed performance tables at its end, and can help identify which features are standard and which are pay-for options.
