Digitizing - TiePie Handyscope HS3 User Manual

= 1ms. The positions at which the signal is sampled are depicted
with the blue dots. The red dotted signal (bottom) is the result
of the reconstruction. The period time of this triangular signal
appears to be 4 ms, which corresponds to an apparent frequency
(alias) of 250 Hz (1.25 kHz - 1 kHz).
To avoid aliasing, always start measuring at the highest sam-
pling frequency and lower the sampling frequency if required.
3.3

Digitizing

When digitizing the samples, the voltage at each sample time is
converted to a number. This is done by comparing the voltage
with a number of levels. The resulting number is the number cor-
responding to the level that is closest to the voltage. The number
of levels is determined by the resolution, according to the following
relation: LevelCount = 2
The higher the resolution, the more levels are available and
the more accurate the input signal can be reconstructed. In figure
3.5, the same signal is digitized, using two different amounts of
levels: 16 (4-bit) and 64 (6-bit).
The Handyscope HS3 measures at e.g. 12 bit resolution (2
levels). The smallest detectable voltage step depends on the input
Figure 3.5: The effect of the resolution
.
Introduction
12
=4096
9