Data logging is the measuring and recording of physical or electrical parameters over a period of time. Some applications require only a single measurement, while others may require multiple channels and multiple types of measurements. Data loggers are available with various channel configurations: single-channel devices, multichannel devices, and modular devices with a mixture of measurement types. Data loggers can measure different types of signals and sensors including the following Production, Voltage, Current, Power Factor and Power Consumption
Using Data logger, we can identify the weak areas and can improve the same area immediately. The earliest form of recording data involved manually taking measurements, recording them to a written log, and plotting them on graph paper. In the late 19th century, this process was automated with the use of strip chart recorders that mechanically recorded measurements onto paper. Strip chart recorders were a great leap over manual recording but still had drawbacks.
Traditional data loggers are stand-alone box instruments that measure signals, convert them to digital data, and store the data to internal memory. Data must be physically transferred to a PC for visualization, analysis, and permanent storage.
PC-based data loggers, on the other hand, are a combination of a data acquisition device and a PC. Because the PC is actually a part of the system, the data logger can take advantage of the ever-increasing performance of the PC processor, hard drive, display, and I/O bus.
With a traditional stand-alone data logger, you must first record the data and then manually transfer it to a PC before you can import it into a spreadsheet program or other tool to graph and visualize the data.
Because a PC-based data logger is always connected to the PC, live measurements are displayed on the PC monitor in real time and you can see results instantly. You can use programming environments, such as Web Based Software, to build custom user interfaces for controlling your measurement device and displaying the results. Creating a user interface with Web Based Software is as simple as dragging and dropping controls and graphs on the user interface.Inline Analysis
Data analysis with a traditional stand-alone data logger is typically performed offline only after the data has been transferred to the PC.
Using a PC-based data logger, you can take advantage of multicore processors and increasingly available RAM in the PC to perform signal processing and analysis on your data as you acquire it. Web Based Software includes many common math and signal processing functions that use configuration wizards and make it easy to add analysis to your measurements.User-Defined Functionality
With a traditional stand-alone data logger, you are generally limited to hardware and software functionality defined by the vendor. These functions are good for accomplishing general-purpose tasks, but they may not help you meet your unique application requirements. For example, you may want to log data only under certain conditions or generate custom alarms that aren't built into the data logger.
PC-based data loggers are software-defined instruments. This means the functionality of the device is defined by the software, and you can customize the software to meet your specific application needs. Using Web Based Software, you can easily build functionality for custom alarms, logging conditions, report generation, and signal analysis. You can log data to virtually any file format for importing into other tools and sharing data with others.Terabytes of Data Storage
Data storage is an important component of a data logger. You can log only as much data as you can store in your data logger. Traditional stand-alone data loggers are limited by the amount of memory built into the device.
Because the PC is actually a part of a PC-based data logger, you are limited only by the amount of hard drive space on the PC. Today, it's not uncommon to find a PC hard drive with terabyte capacity that provides ample space for your current measurements as well as permanent storage space.Network Connectivity
For applications that require long-term monitoring over days or weeks, you may have difficulty continually checking results. Remote monitoring is useful because you can see results from a remote location. Using a PC-based data logger, you can take advantage of the PC's network connectivity to transmit results over a network for remote viewing. With Web Based Software, you can create custom alarm conditions that send e-mails or even design a Web service that you can visualize over a Web-based application.
Web or intranet server to make production information and data available to engineers, customers, and representatives who need quick access to that data. In order to access the data, the user needs to know the address (URL) of the production monitoring data site(s), have a Web browser such as Netscape Navigator or Microsoft Internet Explorer, and have the required passwords to enter the system. The request from the user and sends an HTML file back to the user, which is viewed with a Web browser.
The user may view a RMS report, which may contain an event list, histogram table, curve, and/or 3D Histogram. A time range filter is applied to the request, and the report is sent back to the user.
The date and time ranges are entered, the monitoring site(s) is selected, and the desired produciton monitoring information is selected. The request is sent to the back-end server, and the results are displayed.
The software allows viewing of all data that has been previously downloaded from the monitoring instruments using the monitor’s proprietary software and stored on the network server. For example, if an engineer is looking for events that occurred during the previous week, a password is entered, sites of interest are selected, and the date and time of interest are entered. An event list is returned, and the user may view each event in more detail. The events are viewed individually by phase.
The disturbance detail feature allows the user to view all aspects of an event. Cycle-by-cycle RMS summaries and waveform captures can be used for event analysis and troubleshooting. Data such as this is now immediately available to such groups as control room operators, system protection engineers, customer service representatives, and any other employee connected to the Con Edison network. Access is available across a range of operating systems, including Windows, OS2 and UNIX.