Agilent Technologies 3000 X-Series Manuel de service Page 62

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 156
  • Table des matières
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 61
3Capturing Data
62 Agilent 3000 Series Oscilloscopes User’s Guide
Overview of Sampling
To understand the oscilloscope’s sampling and acquisition modes, it is
helpful to understand sampling theory, aliasing, oscilloscope bandwidth
and sample rate, oscilloscope rise time, oscilloscope bandwidth required,
and how memory depth affects sample rate.
Sampling Theory
The Nyquist sampling theorem states that for a limited bandwidth
(band- limited) signal with maximum frequency f
MAX
, the equally spaced
sampling frequency f
S
must be greater than twice the maximum frequency
f
MAX
, in order to have the signal be uniquely reconstructed without
aliasing.
f
MAX
= f
S
/2 = Nyquist frequency (f
N
) = folding frequency
Aliasing
Aliasing occurs when signals are under- sampled (f
S
< 2f
MAX
). Aliasing is
the signal distortion caused by low frequencies falsely reconstructed from
an insufficient number of sample points.
Vue de la page 61
1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 155 156

Commentaires sur ces manuels

Pas de commentaire