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!

Frequency Entry Step Mode

Controls: Gen Dlg >> Stream >> Tone Freq >> Step
Macro: FstepDlg

The Step mode button makes it convenient to step by constant or exponential amounts between frequencies, or to set frequencies which will fall exactly on FFT spectral lines or musical notes.

This button appears below each main Freq control in the Generator, and opens a Frequency Entry Mode dialog when hit.

The Frequency Entry Mode dialog has controls for selecting Direct, Hertz, Lines, Octave, and Cents steps, and for setting their sizes. When a step mode is selected, it applies to all frequency entry controls, including modulator frequencies and Noise Band edges.

The step mode only affects a frequency being entered or adjusted; afterward, the set frequency remains even if the mode or step value is subsequently changed.

The step mode is a global variable throughout the Generator; it will appear in, and can be changed from, any Generator dialog with a frequency control that has this button. That includes main Tone Frequency, AM, FM, PM, Sweep and Noise Band dialogs, as well as the modulator dialogs for Timing Quantization, Bias, and Shift.

Note that due to the quantization action of step modes other than Direct, attempting to set frequency values lower than half the step size will result in an entered frequency of zero. This can be very disconcerting, for example, if you use a quantizing step mode when setting a carrier frequency, then forget that mode is still in effect when you later go to set a low modulator frequency.

Note that changing Sample Rate causes all Generator frequencies to be updated, which can provoke the above situation. Always set Sample Rate before setting Generator frequencies.

Macro Notes:

FstepDlg=1 opens the Step Mode dialog if a parent dialog showing its button is open, such as the Tone Frequency dialog or one of the modulator dialogs (Timing Mod, Burst Mod, AM, FM, PM, or Sweep). FstepDlg=0 closes it, and FstepDlg=x toggles between open and closed.

Note that you do not need to open this dialog to change controls directly via macro command.

You can set Fstep types by name, as in Fstep=Line, or you can use numeric values, variables, or expressions for setting, reading, or IF testing. For example, Fstep=A + B would set Line if A + B equals 2.

    0 = Dir
    1 = Hz
    2 = Line
    3 = Oct
    4 = Cent

Note that if you use a name instead of a value in an IF test, it must be in quotes: IF.Fstep="Line".


See also Tone Frequency Dialog, Random / Step Timing, Waveform Stream Controls.

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