Measurement Computing eZ-TOMAS version 7.1.x - Manual (Page 31)

eZ-TOMAS & eZ-TOMAS Remote 887591 Edit Menu 3-5
Terms and factors related to the Acquisition Panel
Nyquist Factor Nyquist Factor – The nyquist factor is a representation of the anti-aliasing cutoff
frequency and is equal to the anti-aliasing cutoff frequency divided by the sample
rate. In eZ-TOMAS, the analysis frequency is multiplied by a nyquist factor of 2.56
to obtain the sampling rate. This ensures that a sampled analog signal is accurately
represented.
Sampling Rate The rate at which the signal is sampled . For eZ-TOMAS, the sample rate is always
2.56 times the Analysis Frequency.
Spectral
Resolution
A value related to Analysis Frequency and Spectral Lines. Where Spectral
Resolution equals the Analysis Frequency divided by 2.56. If the Analysis Frequency
was 1000 Hz and if the Spectral Lines was 800 lines; then the Spectral Resolution
would be 1.25 Hz per spectral line. (1000 Hz / 800 = 1.25 Hz)
Input Channels Tab
This tab is used to configure each channel for your project. The available setup options in this window are
dependent on the instrument type selected; for example, the IOtech 655 can measure temperature and the Input
Channels tab will display columns associated with Thermocouples, RTDs, and units in degrees (second figure).
Input Channels Tab, Scrolled Left - Showing the Leftmost Column
Partial Input Channels Tab, Showing temperature related columns for an IOtech 655.