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!

Daqarta Screen Tour

The Help system doesn't include an image of the Daqarta screen, since you can refer to the actual screen by moving the Help window aside. See the Screen Shots section of the Daqarta Website for screen images.

The trace area is the large rectangle that shows the startup "splash screen" logo animation before the Daqarta name, version, and Web address are shown. Notice that there are X and Y axis labels and markings; this area will become a waveform or spectrum display screen when you activate Input or Generator or view a file. (You can enlarge the size of this area if you have a screen resolution higher than 800x600.)

Along the top of the main window, just below the menu bar, is a toolbar with buttons labeled Averager, DD / Open (or DDisk), Generator, Input, Sgram/PT, Spectrum, Trigger, X-Axis, and Zero that toggle main Daqarta features. Below each of these labeled buttons is a thin button which will open a control dialog for that feature. When Daqarta starts up, the Generator control dialog is shown to the right of the trace area by default.

Note: In order to toggle Generator or Input on, at least one channel must be selected in its control dialog. (The Left Generator channel is selected by default.)

The toolbar toggle buttons may also be activated by hitting ALT plus the indicated letter, such as ALT+A to start an average, or ALT+M to view a Spectrogram / Pitch Track (Sgram/PT). The associated control dialog may be opened via CTRL plus the same letter. When you open a control dialog, it replaces any other dialog that may have been visible; you can't have more than one such dialog open at the same time.

A control dialog may be closed by hitting ESCape if the dialog has the keyboard focus (its title bar is blue instead of gray), or by clicking on the little [x] in the upper right corner of the dialog, or by hitting its OK button. If you have a screen resolution of 640x480, you may need to close control dialogs to see the full trace area.

Just below the Averager button is the Total Frames Counter, which counts the number of averager frames accumulated.

Up and down arrow buttons are at the upper left of the trace area Y-axis labels. These buttons change the display range (display magnification) to allow you to better view details of the signal. Alternatively, you can use the PgUp key to increase magnification and PgDn to decrease it at any time. You can also place the mouse cursor on the axis and drag it up to increase or down to decrease magnification. Note that the ranges for different display modes are always kept separate, so changing the waveform range has no effect on the spectrum.

Below the Y-axis labels are left-right arrow buttons which can be used to adjust the low end of the X-axis expansion. A similar pair at the right side of the X-Axis control the high end. But you can just put the mouse near either end of the axis and drag it. Specific end values can be entered from the X-Axis control dialog.

Below the left pair of left-right arrows is the Pause button, which you can also toggle with ALT+P. This pauses the display only; it has no effect on the input or output signal. The Averager (except in Exponential modes) will activate Pause automatically when it has accumulated the requested number of frames.

Next to Pause are four display channel select buttons. When you toggle Generator or Input on, all active channels are displayed by default, and the relevant display select button is shown with its associated trace color. You can toggle off any channel you don't want to see at the moment by clicking on its display select button, which will go to gray until you toggle it back on. This only affects the trace display; Generator channels still send data to the outputs, and the Averager still accumulates data, for example. If a channel is inactive in its control menu, its display select button is grayed and disabled.

When Generator or Input is active, solid and dotted vertical cursor lines appear on the trace (except Sgram/PT) and associated X and Y cursor readouts appear below the X axis. You can directly enter X values, or drag the cursors with the mouse, or use the left and right arrow keys. Unshifted arrow keys move the solid cursor and SHIFT plus the arrow keys move the dotted cursor. (If a dialog control has the keyboard focus, use ALT+arrows for solid and SHIFT+ALT+arrows for dotted.)

A small cursor-colored square is shown in the upper right corner of the trace area on alternating trace updates, so you can tell that the trace is "live" even with a waveform that repeats exactly on each update. At the default 10 msec update interval, on a signal with frequent Trigger events, this may merely seem to flicker.

Above the trace area is the Generator setup title, a long edit control with a description or title of the Generator setup file. This defaults to '440 Hz Sine (default)'. For setups that are included with Daqarta, right-clicking this control will open Help to the relevant topic.

Above the Generator title is a message line that shows status information. (During startup, status messages may be too quick to read. They are intended to be used for diagnostic purposes in case the startup hangs during system or sound card tests.) When there is no message to be shown, this line shows the Generator setup file name.

At the bottom of the window is the Notes area, where you can enter any comments that you would like to be saved with a .DQA data file.

The "Daqarta for Windows" title bar at the very top of the main window will also show the name of any file that is open for viewing, or is being recorded via DDisk.

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