Highpass/ Lowpass Filter

HP04/ LP04

(DJB Instruments: Filters)

Applications:

Signal Conditioning and Displays

Vibration Sensors Vibration Monitoring and Analysis

HP/04

Provides brick wall type minimalisation of spurious low frequency phenomena that may otherwise invalidate data from piezo-electric sources. Supposed vibration acceleration signals may contain thermal and strain induced noise elements, both constrained to the low frequency end of the spectrum by reason of thermal mass and the 1/fo 2 relationship between acceleration vs. displacement respectively. The filter of course acts as the boundary fo, between valid data (>fo) and this type of noise.

LP/04

If low pass complement of HP/04, provides selectable upper frequency boundary, removing unwanted signal components and noise. White noise content of overall signal is proportional to bandwidth, hence LP/04 will produce significant signal/noise improvement where upper frequency can be constrained.