Cirrus Logic CDB5451A - Manual (Page 16)

CDB5451A
16 DS458DB3
3.2.3.1. Last Value
The first column is labelled as “Last Value.” The
value in this box represents the value of the very
last instantaneous sample that was taken (for each
channel) in the most recently-completed computa-
tion cycle. If the user’s analog input waveforms are
AC in nature, then this column of results will rarely
have any meaning. But if the user applies a con-
stant DC input signal to any of the analog input
channels, then the Last Value column for that
channel should display an output code that is rela-
tively constant from one conversion cycle to the
next.
3.2.3.2. Mean
The values in this column represent the simple aver-
age of the sample values in the latest computation cy-
cle.
3.2.3.3. Std Dev.
The values in this column represent the computed
standard deviation over the set of values in the
most recent computation cycle.
3.2.3.4. RMS
The values in this column represent the computed
RMS value over the most recently-completed com-
putation cycle.
3.2.4 Data Collection Window
The Data Collection Window (Figs 6, 8, and 9) al-
lows the user to collect samples sets of data from
CS5451A and analyze them using time domain,
FFT, and histogram plots. The Data Collection
Window is accessible through the Menu option, or
by pressing F4.
3.2.4.1. Collect Button
This button will collect data from the CS5451A, to
be analyzed in the plot area. See the section on
Collecting Data Sets for more information.
Figure 6. Data Collection Window (Time Domain)