Velleman-projects EDU09 Assembly instructions Manuale Utente Scaricare il pdf (Pagina 15)

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Oscilloscope terminology

DC coupling: The oscilloscope displays both the AC and the DC component of a signal.

Digital: Digital scopes perform an analog to digital conversion on the incoming signal and handle all the calculations and displaying in the

digitaldomain.Digitalsignalsfeatureonlytwoxedlevels,usually0Vand+5V.Seealso‘Analog’.

Distortion: Undesired alteration of a signal due to external causes such as overloaded circuits, badly designed circuits, etc…

Noise: Undesired random addition to a signal.

Ripple: Unwanted periodic variation of a DC voltage.

Signal: Voltage applied to the input of the oscilloscope. The subject of your measurement.

Sine wave: Mathematical function that represents a smooth repetitive oscillation. The waveform shown at the start of this glossary is a

sine wave.

Spikes: Fast, short duration transients in a signal.

AC voltage: (AC:AlternatingCurrent)WithAC,theowofthecurrentperiodicallyreverses,asopposedtoDC,wherethecurrentowsin

one direction. An AC source does not have a polarity.

Bandwidth: Usually expressed in MHz. It is the frequency at which an applied sine wave will be displayed at an amplitude of around 70%

of its original amplitude. More expensive scopes feature a higher bandwidth. Rule of thumb: the bandwidth of an oscilloscope needs to be

at least 5 times higher than the frequency of the signal applied to the input of the scope. The EDU09 bandwidth goes up to 200KHz.

DC reference: DCmeasurementisalwaysperformedwithrespecttoagroundlevel,soweneedtodenethisgroundlevel.Ifyoudonot

set the DC reference, the readout might not be correct. In most cases, this ground level will be the center of the screen, however this is

not mandatory.

DC voltage: (DC:DirectCurrent)WithDC,thecurrentowsinasingledirection,itdoesnotreverse.ADCsourcehasapolarity,(+)and(-).

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Velleman-projects EDU09 Assembly instructions Manuale Utente Pagina 15