Digital power meter handles high and low currents

The WT1600S digital power meter is designed to provide cost-effective measurements of both extremely small currents in energy-saving equipment and high currents in applications involving large loads.

The new WT1600S from Yokogawa is a digital power meter designed to provide cost-effective measurements of both extremely small currents in energy-saving equipment and high currents in applications involving large loads.

With prices starting from Eur 6000 for a single-phase instrument, the WT1600S combines up to four power measurements with two input current ranges of 10mA to 5A RMS or 1 to 20A RMS, an input voltage range of 1.5V to 1kV and a frequency range of DC and 0.5Hz to 300 kHz.

The instrument has two separate input elements for low and high current ranges, both of which can be used together in a system.

A large 6.4in TFT colour display can display up to four power measurement parameters at once, with a choice of display formats including numeric, waveform, bargraph, vector, trend or combinations of these.

A harmonic measurement function is capable of measuring waveforms with a fundamental frequency ranging from 10Hz to 1kHz.

Analysis results up to the hundredth order can be displayed in numerical or bargraph form, with harmonic measurements displayed as lists and fundamental waves as vectors.

A motor evaluation function allows the WT1600S to measure a motor's output from a speed and torque sensor on the output and then calculate parameters such as mechanical power, synchronous speed, slip, motor efficiency and total efficiency.

Analogue inputs for torque and pulse inputs for speed can be accepted, and waveforms can be displayed to provide a visual picture of fluctuations in parameter values.

A 10Base-T Ethernet port for network or web connections is available as an option.

Standard interfaces include GPIB or RS232, and a VGA output for a large screen display.

A "start/stop" function allows synchronised measurement with two linked instruments, and an external clock input enables accurate measurement of harmonics when using low-frequency signal inputs.

Waveforms, numerical values and screen displays can be saved to an internal floppy disk drive or an optional internal hard drive.

The instrument can also be used with Yokogawa's WTViewer 760122 software, which provides FTP client and server functions for data transfer and can also control up to four WT1600S instruments simultaneously.

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