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!

DDisk Cursor Units Toggle

Controls: DDisk Dialog >> Cursor Units
Macro: DDiskCurs

When a DDisk file (longer than 1024 samples) or static file (1024 samples) is open and in waveform display mode (Spectrum and Sgram off), this button allows the solid and dotted cursor position readouts to display X values in the units set via the DDisk Units buttons above it, relative to the start of the file instead of the normal start of the display frame.

One handy use for this control is when you have a long file with a separate list of event times, perhaps saved in a log file or Notes, and you want to scroll through the file to view each event. The DDisk Position readout at the lower right of the display area can be monitored as you scroll, until you are close to the recorded event time. Then the cursors can be dragged until the readout matches the event time.

Alternatively, you can enter the time directly in the DDisk Position control to jump directly to the event, then scroll back and use the cursor readouts to view whatever led to the onset of the event.

When the DDisk control dialog isn't active to see this button, you can alternatively use the ALT-SHIFT-U hot-key accelerator combination to toggle it.

When the button is on and the units are are active, the solid and dotted position readouts will have pink backgrounds. In this mode, you can still use the small up/down buttons at the right end of each readout to scroll the cursor position, but you can't use direct entry.

Note that when displaying the waveform amplitude histogram of a file, the X axis is in Volts (or selected User Units) instead of time, so this Cursor Units button has no effect.

For open DDisk files, you can change the units used without opening the DDisk control dialog by clicking the DDisk Position readout units button. Each click will scroll to the next units option. Alternatively, the ALT+SHIFT+D hot-key combination will scroll through the units.

For static files the DDisk Position readout isn't present, so you will either need to open the dialog, or use the hot-keys, both for scrolling the units and for toggling DDisk Cursor Units mode.

Note that when the Units are HMS, Local, or UTC, the seconds resolution is reduced to 3 decimal places (HH:MM:SS.nnn) to fit in the readout window. At the default sound card sample rate of 48000 Hz each sample is only 20.833 microseconds, or 0.000020833 seconds. You may thus have to move the cursor by as much as 48 samples to see a change in the readout value of 1 millisecond.

Important: As noted, when Cursor Units mode is active the readouts show values relative to the start of the file. For Bytes, Samples, Seconds, and HMS the start is always 0. But for Local and UTC the start is a clock time, which Daqarta derives by noting the time the file was saved and computing backwards to the start time from the sample rate and the number of samples. That means if you modify the file, such as by adding Notes and re-saving under the same name, the Local and UTC times will be wrong.


Macro Notes:

DDiskCurs=1 sets Cursor Units on, DDiskCurs=0 sets it off, and DDiskCurs=x toggles the current state.

DDiskCurs=A sets the state according to variable A (which may be an integer, float, or fixed-point variable), where an absolute value of 0.5 or more will set Cursor Units on, and anything less will set it off.

UA=DDiskCurs will set UA with the current 0 or 1 Cursor Units state.


See also Direct-To-Disk (DDisk) Toggle, DDisk Controls Dialog

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