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!

Cursor Time Constant (TC)

Controls: Edit Menu >> Run Preferences >> Cursor TC
Macro: CursTC

This controls the rate at which cursor readout values can change. If the actual data values at the cursor positions are jumping around due to noise, they can be hard to read. The cursor time constant controls an exponential smoothing operation on the stream of changing values, so that each readout shows an average value over time.

Cursor TC settings may range from 0 to 31, where 0 is no smoothing at all: The readouts change immediately when the data values change. The default setting is 5.

To convert TC values to time constants in seconds, see Voltmeter Time Constant.

If the actual data stream changes suddenly, the readout values may exhibit a lag before they settle to the new averages. This becomes more of a problem at large Cursor TCs, so you must select a TC that is a compromise between jittery readouts on noisy data, and lagging response on true data changes.

You can reset the readout averages to the current instantaneous data values via ALT+K. This allows you to set a high TC for smooth response, then manually reset as needed if you see some obvious change in the trace that the cursors are slow in responding to.

A cursor readout is also reset with the current data value whenever that cursor is moved.


See also Run Preferences Dialog

GO:

Questions? Comments? Contact us!

We respond to ALL inquiries, typically within 24 hrs.
INTERSTELLAR RESEARCH:
Over 30 Years of Innovative Instrumentation
© Copyright 2007 - 2017 by Interstellar Research
All rights reserved