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!

Data Zero Manual Null Buttons

Controls: Zero Dialog >> Manual >> Null
Macros: Ch.ZeroNull, LI.ZeroNull, etc.

The Null buttons are used in Data Zero Manual mode to set the true zero position on a DC-coupled measurement system. When you press the button, the Manual Adjust value is automatically set to the current average value for that channel, as determined by averaging 1024 samples.

The units shown will be in percent of full scale, or volts (or User Units), depending on the state of the Units button on the right. You can toggle Units at any time.

To use the Null buttons, you first set the external measuring system to produce an effective zero input condition on a channel. This may involve venting a relative pressure sensor to atmosphere, putting a thermocouple into an ice bath (or into thermal contact with the reference temperature), or shorting the input leads of a voltmeter circuit. When you have done this, whatever DC level is read by the ADC must be treated as the effective zero, even if it is not zero volts. Hitting the Null button for that channel will do this automatically.


Macro Notes:

LI.ZeroNull=1 nulls the Left Input channel. The null operation takes place no matter what value you supply in the macro, including 0.

Similarly, RI.ZeroNull sets the Right Input, LO.ZeroNull sets the Left Output, and RO.ZeroNull sets the Right Output.

Alternatively, you can use the Ch. prefix to set a channel previously specified via the Ch Channel Select command.

Note that attempts to use these commands when the controls are disabled in Spectrum, Spectrogram, or Pitch Track modes will result in "Control disabled. Aborting macro."


See also Zero (Cursor, Average, Peak, or Manual)


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