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!

Decimate Rate (Hz or sec)

Controls: X-Axis Dialog >> Slow >> Hz/Sec
Macros: DecRate, DecUnits

When Decimate is active, this specifies the effective sample rate that will be used for the display. It can be expressed in Hz (default) or in seconds by toggling the units button at the right.

The Decimate Rate in Hz is equivalent to the true sample rate divided by the Decimate Factor (X) just above this control. You can adjust whichever is convenient.

For example, knowing that the waveform display holds up to 1024 samples, if you toggle the units button to sec and enter '1m' or '0.001' here, the display will show up to 1024 msec of waveform. Entering '1' will show up to 1024 seconds, while entering '3600' (one sample per hour) will show up to 1024 hours.

Note that this control works by adjusting the Decimate Factor, which is limited to 2147483648 (2^31). At a true sample rate of 48000 Hz this would limit the effective maximum sample period to 44739.24 seconds, or 12.427 hours. So if you want one sample per day (86400 sec) you will first have to set the true rate to 24000 Hz.


See also Slow (Decimate) Controls, X-Axis Control 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