Graph Software for Scientists & Engineers

Digital Recorders and Data Processing


The licensed version of DPlot includes support for output files from the most popular digital recorders: several different formats produced by Pacific Instruments recorders, Nicolet time domain files, Tektronix .WFM files, Gould Instrument Systems .DAT files, Hi-Techniques Win600 .DAT files, LeCroy WavePro data files, AMO Saturn Transient Recorder data files, LAS Well Log Files, and Campbell Scientific Datalogger files. No other commercial graph software includes support for this collection of formats.
This and the following examples all show the same 200 Khz record taken from a Nicolet WFT file. The plot is of pressure vs. time for an explosive test. The unedited data:
DPlot provides a data processing mode, the primary feature of which is the automatic integration of pressure and acceleration records to obtain impulse or velocity and displacement, respectively. Integrated records are automatically regenerated when you make changes to the primary record.
Often with high-speed recordings, small calibration errors can lead to a small offset in the data. That offset may not be noticeable in the primary record, but show up as a positive or negative slope in an integrated record. Though that slope is propagated through the entire record, it is most obvious at a time when the integrated value should be close to zero. In the example above, the integrated record shows a positive impulse at the arrival time of the shock. You can easily correct this by using DPlot's Baseline Shift command. The baseline shift adds or subtracts a constant value from the primary record to yield the desired value in the integrated record (in this case, impulse=0 at the arrival time).
DPlot includes several options for reducing noise in recorded data, including a general smoothing function and several low-pass filters. The result of one of those filters is shown here:
 
DPlot's filter routine also includes bandpass and bandstop filters, for accepting or rejecting a range of frequencies, respectively.
DPlot's many data-generation features include an FFT, useful for finding the predominant frequencies in a signal. This is especially useful for determining whether a signal has been corrupted by, for example, 60Hz noise. In that case you can generally eliminate that noise with one of the bandstop filters mentioned above.

For a more complete list of DPlot features see the Features page.

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"I sought a more powerful plotting software than Excel, MATLAB. I was surprised at the cost of this program and wasn't sure if we would need any additional add-on software ($$$$)! That's when I came across DPlot. WOW! It is simple to use, affordable, and met all my requirements at a fraction of the cost."
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My current tasks include the evaluation of the T55 Engine performance and control system. My team conducts dynamic testing to ensure criteria can be met in combat.

At 16Hz data sampling, we could plot our data in Excel (XYY). With the new 100Hz sampling equipment, Excel will not open these large files. In addition, the plots are limited to 32K data points. I sought out a more powerful plotting software, MATLAB. I was surprised at the cost of this program and wasn't sure if we would need any additional add-on software ($$$$)! That's when I came across DPlot. WOW! It is simple to use, affordable, and met all my requirements at a fraction of the cost.

If anyone is looking to supplement his or her Excel plotting feature, this program is for him or her. Because of not having to split my .csv files into 32000 data points, along with the many other added features, this program has paid for itself. Thanks for a wonderful product, not to mention the great Technical Support!

Phillip Mathis
Maintenance Engineer
CRUZ and Associate Inc.

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