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 Sweep Linear / Exponential


Macro: SweepMode

This pair of radio buttons control the shape of the sweep. When Linear is active, the total End minus Start frequency range is simply divided by the duration to give a fixed number of Hz per second (or per sample).

In Exponential mode, the frequency at each sample time is the value of the prior frequency, times a constant. Thus, the higher the frequency, the faster the motion. This gives a fixed number of octaves per second, rather than Hz per second.

This is useful for testing many real-world systems which exhibit an exponential response; it is necessary to move the driving frequency more slowly at lower frequencies to capture response details with the same resolution as a faster sweep at higher frequencies.


Macro Notes:

L.1.SweepMode=Lin sets the Left Stream 1 Sweep Mode to Linear, while Exp sets it to Exponential. Alternatively, you can use numeric values, variables, or expressions equal to 0 and 1 in place of 'Lin' and 'Exp', respectively.


See also Frequency Sweep, Waveform Stream Controls

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