Daqarta
Data AcQuisition And Real-Time Analysis
Scope - Spectrum - Spectrogram - Signal Generator
Software for Windows
Science with your Sound Card!
The following is from the Daqarta Help system:

Features:

Oscilloscope

Spectrum Analyzer

8-Channel
Signal Generator

(Absolutely FREE!)

Spectrogram

Pitch Tracker

Pitch-to-MIDI

DaqMusiq Generator
(Free Music... Forever!)

Engine Simulator

LCR Meter

Remote Operation

DC Measurements

True RMS Voltmeter

Sound Level Meter

Frequency Counter
    Period
    Event
    Spectral Event

    Temperature
    Pressure
    MHz Frequencies

Data Logger

Waveform Averager

Histogram

Post-Stimulus Time
Histogram (PSTH)

THD Meter

IMD Meter

Precision Phase Meter

Pulse Meter

Macro System

Multi-Trace Arrays

Trigger Controls

Auto-Calibration

Spectral Peak Track

Spectrum Limit Testing

Direct-to-Disk Recording

Accessibility

Applications:

Frequency response

Distortion measurement

Speech and music

Microphone calibration

Loudspeaker test

Auditory phenomena

Musical instrument tuning

Animal sound

Evoked potentials

Rotating machinery

Automotive

Product test

Contact us about
your application!

Save Trace as .TXT Text File

Controls: File Menu >> Save TXT
Macro: SaveTXT

You may want to save data in a text format to be readable by humans, or you may want to export the data to a data presentation package that supports text files but not raw data.

This option saves data as plain ASCII text. It saves the data from the current display to a single-screen file, which contains data for 1024 samples per channel. All active channels will be saved, even if they are not currently displayed.

Each file is saved with a header that includes relevant information such as the type of data (Wave, Spectrum, Wave Average, etc), the number of frames for averages, the Daqarta Generator setup title (if applicable), and any user Notes. Label and Field data is included if present.

Data appears in columns separated by white space; it is not comma-separated. The first column is always the X-axis variable, followed by a column for each active channel. Columns are labeled with units and channel descriptions.

Here is an example showing the header and first few data points for a typical file:

 
Wave Average   32 frames
Gen:    Dual Sine

Notes:
Test of averaged Dual Sine output.

                  L.Out           R.Out
  msecs           mVolts          nVolts
 0.0000000       138.1568898    -69.2794576
 0.0226757      -16.5338515     -65.0880956
 0.0453515      -169.8923098    -60.6441846
 0.0680272      -309.5512367    -55.9753620
   ...              ...             ...
 

Waveform files have 1024 lines of data, one for each sample. Spectrum files have 512 lines of data, one for each spectral line. If Spectrum Cursor Peak is active, the high-resolution readouts are included after the main data, following one blank spacer line.

The text file always includes the full waveform or spectrum, even if the display has been expanded to show only a small portion of it.

If the text file is to be read automatically by another program, you will need to "teach" that software how to read the file. You may have to specify that the data is separated by white space instead of commas, the destination for the data from each column, and what parts of the header to ignore. Please note that the header is not a fixed number of bytes, nor even a fixed number of lines. For example, if there are no Notes then that section is omitted; conversely, there can be many lines of Notes.

You can not save Spectrogram or Pitch Track (Sgram/PT) data to a text file using this option. If you try that, the saved file will be the waveform data used for the most recent spectrum computation.

This option is disabled during DDisk recording, or when there are no active Input or Output (Generator) channels.


Macro Notes:

The SaveTXT macro has no effect if any File Open or Save As dialog is already active.

SaveTXT= without a name will open the Save As dialog showing all .TXT files, with the default set to Data or the most recent name.

SaveTXT="MyFile" will open the Save As dialog with the default name set to MyFile. (Note that quotes are needed around all filenames in macros.) If you accept this by hitting Enter or the Save button in that dialog, Daqarta will assume you want to save a file named MyFile.TXT. If that file already exists, you will be prompted to replace it.

After either of the above commands, you may use IF.Posn?f=0 to see if the user has hit Cancel instead of choosing a file name. This allows your macro to exit gracefully or take other action.

A.SaveTXT="MyFile" will save MyFile.TXT directly, without any Save As dialog. Note that if the file already exists, it will be overwritten without any confirmation prompt.

SaveTXT can use string variables and expressions. For example, SaveTXT=Field1 will use the contents of Field1 as the default file name, and A.SaveTXT=Field1 will save a file with that name directly.

Similarly, if the Macro Variable Var0 holds a value of 12, then SaveTXT="Test"+Var0 will set a default file name of Test12. If you expect to use a large series of files, you can use SaveTXT="Test"+Var0(3) (for example) to set the decimal format to 3 integer places to get Test012. This will allow proper sorting by file name.

A.SaveTXT= will save directly using the current default file name. If you have previously set file names to Auto-Increment, either manually or using AutoInc=1, then this will save using the next file name (MyFile-001.TXT, MyFile-002.TXT, etc).

See Macro Variables for a way to use a Field to supply the initial name that AutoInc starts with.

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