Measurement Computing eZ-TOMAS version 7.1.x - Manual (Page 28)

eZ-TOMAS & eZ-TOMAS Remote 887591 Edit Menu 3-2
Configuration… (Ctrl+E) Edit Menu
This opens the Setup Configuration Window, which has three separate tabs for configuring the acquisition
device. Click the appropriate tab [Acquisition, Input Channels, or Storage], make the necessary changes in
each, then click the <OK> button to save all your changes and close the window.
Clicking the button will undo all unsaved changes.
You must turn acquisition off and then on again for Acquisition Configuration
changes to take effect.
Acquisition Tab
Acquisition Tab
The Acquisition tab is used to configure how the data will be acquired and processed. For eZ-TOMAS,
sampling rate and through-put rate are determined by two user-set parameters: Analysis Frequency
and Spectral Lines. The following table shows parameter relationships. Information was obtained from
the above screen-shot.
Parameter Calculation (based on above Acquisition Tab)
Sampling Rate
= Analysis Frequency x Nyquist Factor
= 500 Hz x 2.56
= 1280 samples per second The sampling rate applies to
ALL input channels.
Time Resolution
= 1 / Sampling Rate
= 1 / 1280 samples per second
= 0.000781 seconds
Acquisition Time
= Spectral Lines / Analysis Frequency
= 800 Lines / 500 Hz
= 1.6 seconds
Frequency Resolution
= Analysis Frequency / Spectral Lines
= 500 Hz / 800 Lines
= 0.625 Hz
Block of Time Data
= Spectral Lines x Nyquist
= 800 x 2.56
= 2048 samples