TOP, The Output ProcessorTOP, The Output Processor®

Software for Visualizing Monitoring Data and Simulation Results

About TOP
TOP reads data from a variety of sources and transforms it into high quality graphics for inclusion in reports and documents. TOP was developed by Electrotek Concepts® to visualize data from a variety of simulation and measurement programs.

Data formats supported include

TOP utilizes the Microsoft® Windows®* graphical user interface to simplify usage of the program. TOP takes advantage of the Windows clipboard to allow easy transfer of data to other Windows programs.


* Windows 3.x or higher

Output Formats
TOP provides a number of ways to visualize data as tables and graphs. Typical presentation modes include

  • Waveform & Spectrum Plots
  • Frequency Response Plots
  • Summary Tables (including IEEE Std 519 application)
  • Summary Bar/Column Charts
  • Cumulative Probability Plots
  • Probability Density Charts
  • 3D Magnitude-Duration Histograms (downloaded from PQWeb®)
  • Background (CBEMA, ITIC, etc.) Curves for Magnitude-Duration Plots


TOP utilizes Microsoft's Multiple Document Interface (MDI) to allow you to simultaneously view several different plots in multiple windows. You can move, size, and arrange the windows on the screen as desired, and any window can be printed at a command or keystroke. Because of the functionality offered by Microsoft Windows, TOP does not need to be updated every time a new printer or display device is installed.

The data displayed in any window can also be exported to a file or pasted to the Windows clipboard in a variety of graphical, numerical, or text formats. Supported export formats include

  • PQDIF (.PQD)
  • Windows Metafile (.WMF)
  • Portable Network Graphics (.PNG)
  • Comma Separated Value (.CSV)
  • ASCII Tabbed Text (.TXT)
Using TOP
TOP manipulates the data to be displayed using a mechanism called the stack (illustrated below). First, you select a file that contains the data to be visualized. TOP then generates a dialog box displaying all of the quantities (objects) available in the current file.

You then select the items of interest, which TOP loads into memory. This process is similar to selecting a file folder from a file cabinet, selecting specific papers in the file that are of interest, and piling them in a stack on your desk.

You can reactivate the dialog box at any time and load more data objects onto this stack. You can also select another file at any time and load data from that file onto the stack. The result is a stack of data objects of potentially different types and origin that are now available for visualization. You can now select one or more of the items on the stack and request TOP to display that data in one of the many tabular or graphical formats.


Data Modification and Analysis
TOP includes a feature called TOPCalcTM. TOPCalc allows you to perform mathematical operations on the various supported data objects. These operations include
  • Addition, subtraction, multiplication, division
  • Inversion, absolute value
  • Fast Fourier Transformer (FFT)
  • Inverse Discrete Fourier Transform (IDFT)
  • Square, square root
  • Power, energy, I2t, X-Y combine, integrate
  • Filter, time shift
  • Cumulative probability
  • Probability distribution
  • Waveform sampling

In addition to TOPCalc, TOP provides options to link units of measurement to a stack item as well as enable per-unitization of the data.


TOP also provides the ability to produce new stack objects from user-specified expressions.

expression evaluator

TOP Support
For usage and support questions or problems, please first refer to the FAQ page. If you still need assistance, please send an e-mail to

Obtaining TOP
TOP is available free of charge and may be downloaded from this web site. The current version of TOP is Version 6.02.

PQDiffractor is also available from Electrotek Concepts at no cost. PQDiffractor is a free PQDIF file viewer and free COMTRADE file viewer written by Electrotek Concepts for viewing, browsing, diagnosing, and converting PQDIF files and COMTRADE files, and is a free software download from

How do I report a bug or problem?
Please e-mail to report problems or bugs.

What if I need more information?
For more information, please contact:

Electrotek Concepts
(865) 470-9222 or FAX (865) 247-5984

"TOP, The Output Processor", "SuperHarm" and "PQWeb" are registered trademarks
of Electrotek Concepts, Inc.

"Electrotek Concepts" is a registered service mark of Electrotek Concepts, Inc.
"PQNode" is a registered trademark of Dranetz
"PSCAD" is a registered trademark of Manitoba HVDC Research Centre
"V-Harm" is a trademark of Cooper Power Systems, Inc.
"PowerLogic" is a registered trademark of Schneider Electric
"Electric Power Research Institute" and "EPRI" are registered service marks of the Electric Power Research Institute, Inc.
"Microsoft" and "Windows" are registered trademarks of Microsoft Corporation

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