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!

dB / Step

This control is display-only in Meter mode. When you enter a Volts value, this shows the equivalent dB change from the previous (louder, less-negative step number) value.

In Init Table of Match mode, this control specifies a dB value to be assumed for each step of the attenuator. This is only to serve as a convenient starting point, since some attenuators have many steps of the same size.

In Step Edit of Match mode, this control specifies a dB value for the attenuator step selected by the Left Step control above it. If you are using the cancellation method, adjust this value until you hear a null (or a minimum). If you are using the alternating method, adjust for a steady tone. After you find the match point, adjust Left Step to the next-lower (more negative) step and repeat.

Note that it is extremely common to have steps where you will need to enter 0 here to get a match. That means that there is no change from the prior (louder) step. This happens when the sound card maker (or Windows) declares that the card has more steps than it actually has, and inserts dummy steps throughout the range so that the standard Windows mixer sliders appear to have finer resolution. To avoid having to enter each of these 0 values manually, Init Table defaults to setting 0 for all steps, so you only need to enter values for the truly functional steps.


See also Meter / Match Mode Control, Calibrate Wave / Master, Generator Attenuator Options Dialog.

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