|
|
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,
Datataker .DBD 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.
|
"DataTaker now supplies a copy of the popular DPlot software program with every new DT80, DT82E, DT85, DT80G and DT85G. DPlot and DataTaker have produced a custom
plug-in that allows DataTaker binary files to open directly with DPlot for analysing. DPlot is available as a 30 day trial download for existing DataTaker users
and a full licence can be purchased online from the DPlot website."
Lontek News
RUNS ON
Windows 7, 2008,
Vista, XP, NT,
ME, 2003, 2000,
Windows 98, 95
|
|
