Omega Vehicle Security OMP-MODL Manuel d'utilisateur télécharger pdf (Page 286)

11.. . APPENDIX F: FILTERING OPTIONS

USING THE OMP-MODL11-124

The above plot demonstrates the performance of the 50Hz software filtering. The

plot is from actual data collected by a OMP-MODL (which utilizes the same digital

signal processing) during the development and testing of the software filtering

feature. A 5Vp-p AC swept frequency was super-imposed on a 2.5VDC and input

into a OMP-MODL equpped with an HLIM-1 The input channel was configured with

the 50 Hz filtering enabled. As can be seen from the plot, at 50 Hz, the amplitude of

the noise is radically reduced.

As with all filtering, a compromise is involved. Line Rejection filtering adds

approximately 8.5 mS for 60 Hz rejection (10mS for 50Hz) to the measurement and

processing time required for a reading.

If the desired sampling rate allows, enable Line Reject filtering by selecting 50 or 60

Hz depending on the power line frequency used in the installation locale. In the

USA, 60 Hz should be selected.

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Omega Vehicle Security OMP-MODL Manuel d'utilisateur Page 286