Data AcQuisition And Real-Time AnalysisScope - Spectrum - Spectrogram - Signal Generator
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Sound Card Arb (Arbitrary) Wave Dialog
Arbitrary waveforms allow you to simply load a file to obtain any custom waveform you desire. These files are analogous to the wavetables used for music synthesis. Each typically holds exactly one cycle of the desired waveform.
The Arb Wave dialog allows up to 8 Arb files to be loaded at one time. These files are available to any stream of either channel, and more than one stream can use the same file simultaneously but completely independently.
Daqarta includes a large set of Arb files having names that start with "Arb_" and have .DAT file extensions, such as Arb_HalfRectSine.DAT. These were created with the Arb_From_Equation macro mini-app, but you can use other methods or file types, including previously-created files. See Arb Files 0-7, below.
Alternatively, you can use MemArb macros to create Arbs directly in memory. These otherwise behave exactly as Arbs loaded from files.
L.1.Wave=Arb or L.1.Wave=5 sets Left Stream 1 Wave to Arb, but only if an Arb file is already loaded and selected for that stream. Note that this command may set Wave, but does not open the Arb dialog. This is the usual approach for modifying Generator setups.
If the Wave dialog is already open, D.L.1.Wave=Arb will open the Arb dialog, and also set Wave to Arb if there is an Arb file loaded and selected.
When there are multiple Arb files loaded, only one may be selected (button depressed) in any given stream. That is the one that will be activated by Wave=Arb for that stream.
Loading a file to a given stream will also select it for that stream. The file will be present in all other streams of both channels, but not selected. To select it for a specific stream, use Arb0=1 to Arb7=1 as needed for that stream.
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