COMPARATIVE STUDY OF ANALOGUE AND DIGITAL READOUTS FROM INSTRUMENT

Adenodi, Raphael Adewale

Physics Department, Adeyemi College of Education, Ondo, Nigeria.

 

Abstract

Attentions are shifted from analogue to digital instrument because of its advantages. Many analogue instruments in school laboratories are yet to be replaced by digital ones due to lack of fund. Sometimes the readouts of these instruments are interchanged with suitable digital ones to provide near-relevant experiences with digital readout. In this research, the analogue readout of a field intensity meter was connected in parallel with a suitable digital readout and a toggle switch was used to select either of the meters during field intensity measurement campaign. Field intensity of some radio broadcasting stations were measured with both readouts and recorded. The aim of the study is to determine the relationship between the data sets and associated error size. The result reveals negligible error in terms of Root Mean Square Error (RMSE), Standard Deviation with Bessel’s Correction (SDBC) and mean difference of 1.19, 1.27 and 0.19 ± 0.02 respectively between the digital and analogue data sets.  The means and standard deviation (SD) are 4.39 ± 0.44 and 5.85 for digital and 4.20 ± 0.42 and 5.52 for analogue respectively. With and above, a linear relationship exists between the two data sets. The study concludes that the analogue readout of an instrument can be replaced with a digital readout if the error between the set of readings from the readouts is negligible.