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!

PM Status Monitor

Beneath the PM Mod Source control is the Status Monitor. This is a status display only, not a control. It shows the instantaneous modulation being computed at the time the display is updated (about 10 times per second default).

Note, however, that this is not the same as the actual output Depth at the instant you view it. The samples are computed and sent to a buffer ahead of the time they are needed for output, so this monitor is actually more of a "preview". (You can set the buffer size with the Wave Block control in the Start Preferences dialog.)

This monitor is only useful for very slow modulation rates, where the values don't change too quickly to be read. This is true whether the source is a sine using the Mod Frequency control, or a more complex waveform using stream modulation. At fast rates, the monitor is likely to jump around too much to be useful.

Also, if the modulator changes too quickly, the next update may catch it at a point in another cycle that doesn't seem to follow the prior value.


See also Phase / Slope / Width Modulation, PM / Slope / PWM Dialog, Waveform Stream Controls.

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