ScopeCorders extend measurement range with real-time power analysis
The two new instruments in the family of portable multi-channel data-acquisition recorders are the DL850E and DL850EV (Vehicle Edition) ScopeCorders. Introducing the instruments. The company’s Product Marketing Manager Kelvin Hagebeuk acknowledges that this instrument format is one in which Yokogawa stands almost alone; and the main competition to the functions it provides is likely to be a PC-based configuration involving data acquitision cards in a rack-mount format. In contrast, he empahsises, the ScopeCorder product is ready to gather data out-of-the-box; “you don’t have to program it”.
“Applications exist anywhere you have to make electrical measurements and that electromechanical systems are under test,” he says; the units incorporate a number of new features for development and fault finding in areas such as power electronics, mechatronics and transportation. In addition to the high-speed multi-channel capabilities plus long memory and isolated input channels found in Yokogawa’s established ScopeCorder family, the new DL850E instruments have the ability to carry out the real-time measurement and analysis of electrical power.
All members of the ScopeCorder family are equipped with a set of basic arithmetic mathematical functions such as addition, subtraction, division, multiplication, fast Fourier transformation and other computations, but the new DL850E versions also offer the /G5 option for real-time measurement of electrical power as well as the existing /G3 option for real-time mathematical computations and digital filtering and the /G2 option for user-defined computations. With the /G5 electrical power option, trend calculations such as active power, power factor, integrated power and harmonics can be carried out at data update rates up to 100 ksamples/sec using a dedicated digital signal processor (DSP) that is able to calculate and display up to 126 types of electrical power related parameters in real time. This enables the user to display raw waveform signals such as voltages and currents along with calculated power parameters as well as the capability to trigger on any or all of them. Trend waveforms of each order of harmonics, bar-graphs and vector displays can be displayed. Both RMS and power analysis modes are available. In addition to the powerful power calculations, the /G5 option also contains all the functionality of the /G3 real-time mathematics option.
Like existing members of Yokogawa’s ScopeCorder family, the DL850E combines features from a high-performance digital oscilloscope and a multi-channel data-acquisition recorder. It can capture and analyse both transient events and trends over time periods from milliseconds up to 200 days, storing acquired data in the large acquisition memory, the internal hard disk and/or an external PC hard disk. Maximum sample rate is 100 Msamples/sec, and real-time bandwidth, around 20MHz
Flexible modular inputs enable the DL850E to combine measurements of electrical signals, physical parameters from sensors, and data from CAN/LIN serial buses – with decode facilities. A choice of 17 input modules allows the instrument to be configured up to a maximum of 128 channels, giving engineers a thorough insight into any application by synchronising the measurement of different types of electrical and physical signals. Individually isolated and shielded input channels provide high resolution and high sample rates, while Yokogawa’s unique “dual capture” feature allows transient signals to be captured during long-term measurements by recording at two different sampling rates.
Data is always time-stamped, from an internal clock if the instruments are running stand-alone. An option adds GPS time synchronisation so that the time-stamps on separate instruments are correlated to within 200 nsec; Yokogawa provides software so that you can re-assemble the records from several such instruments and data collections into one display.
The DL850E and DL850EV ScopeCorders are equipped with a large and fast acquisition memory, allowing storage of up to 2 gigapoints of data and providing high sample rates of up to 100 Msamples/sec on multiple channels simultaneously. Data is always captured at full data rate with a pre/post trigger buffer; you can select the effective sample rate for long records in which case a large fraction of the sameples are discarded. On seeing a specified trigger event, the instrument switches to a saving all the samples for a detailed trace of that event. Yokogawa’s unique history memory function allows users to quickly isolate and examine individual waveform records for detailed analysis; a DSP-based zoom function enhances the search.
The ScopeCorder DE850EV Vehicle Edition is designed for engineers working in the automotive and railway industries. A common measurement challenge is to combine measurements of electrical signals, physical performance parameters acquired by sensors, and CAN- or LIN-bus data transmitted by the powertrain management system. The DL850EV Vehicle Edition addresses this requirement by providing a thorough insight into the dynamic behaviour of the electromechanical system. The result is a considerable saving of time saved compared to other approaches such analysis on a PC or the use of other software.
A DC power option allows the DL850EV to be used in a vehicle, with power being supplied by the vehicle’s DC battery. The DC power option allows AC and DC power supplies to be used together to ensure a highly reliable power source. If the AC power goes down, the DL850V instantly switches to a DC input without interrupting the measurement.
Yokogawa; www.tmi.yokogawa.com
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