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!

Frequency Counter - Hertz Measurement

Controls: Options Menu >> Frequency Counter >> Hertz
Macros: FcountMode=Hz, Freq, Total

When this button is active the large Frequency Counter readout shows the frequency of the Trigger Source in hertz. Make sure that Trigger is active, Mode is set to Normal, and that Trigger Slope, Level, and Hysteresis are set appropriately for the signal to be measured. Note that Hysteresis is especially important for proper Frequency Counter operation when noise is present, much more so than for simple display triggering.

If the Hertz display is too jumpy, set the Frequency Counter update rate to Slow.

Trigger Holdoff should normally be set to zero. But to measure the rate of tone or noise bursts, without interference from the tone or noise itself, set Holdoff longer than the duration of the burst on-time: The trigger logic will be locked out after the first trigger of each burst is found, and won't be re-enabled until after the burst is past; it will then be ready to trigger on the next burst.

If no triggers are detected, or if Trigger is not active, the frequency remains at zero.

You can use the Min/Max buttons at any time to see the minimum and maximum frequencies since the last Reset.


Macro Notes:

FcountMode=Hz or FcountMode=0 sets the Frequency Counter to Hz mode. You can use either mnemonic names or numeric values (or variables or expressions) for setting, reading, or IF testing:

    0 = Hz
    1 = RPM
    2 = msec
    3 = Tot
    4 = SpecTot

Note that if you use a name instead of a value in an IF test, it must be in quotes: IF.FcountMode="Hz".

Freq is an internal variable that holds the current Frequency Counter readout value, dependent on the chosen mode (Hz, RPM, msec, Total, or SpecTot).

Total holds the count of total cycles counted since the last Reset, valid during Hz, RPM, or msec modes.


See also Frequency Counter


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