CDB5378
DS639DB4
45
3.3.6
Data Capture
The
Data Capture
sub-panel collects samples from the target board and sets analysis parameters.
When the
Capture
button is pressed, the requested number of samples are collected from the target board
through the USB port. The maximum number of samples that can be collected is 1,048,576 (1M). The
number of samples should be a power of two for the analysis FFT routines to work properly.
After data is collected, analysis is performed using the selected parameters and the results are displayed
on the
Analysis
panel. The selected analysis
window
,
bandwidth limit
,
full scale code
, and
full scale volt-
age
parameters can be modified for the data set currently in memory and the analysis re-run by pressing
the
REFRESH
button on the
Analysis
Panel.
Control
Description
Total Samples
Sets the total number of samples to be collected. A maximum of 1,048,576 (1M)
samples can be collected.
Window
Selects the type of analysis windowing function to be applied to the collected data
set. Used to ensure proper analysis of discontinuous data sets.
Bandwidth Limit (Hz)
Sets the frequency range over which to perform analysis, used to exclude higher-fre-
quency components. Default value of zero performs analysis for the full Nyquist fre-
quency range.
Full Scale Code
Defines the maximum positive full-scale 24-bit code from the digital filter. Used during
FFT noise analysis to set the 0 dB reference level.
Full Scale Voltage
Defines the maximum peak-to-peak input voltage for the nV/rtHz Spot Noise analy-
sis.
Total Captures
Sets the number of data sets to be collected and averaged together in the FFT mag-
nitude domain. The maximum number of data sets that can be averaged is 100.
Capture
Starts data collection from the target board through the USB port. After data collec-
tion, analysis is run using parameters from this sub-panel.
Remaining Captures
Indicates how many more data captures are remaining to complete the requested
number of
Total Captures
. A zero value means that the current data capture is the
last one.
Skip Samples
Sets the total number of samples to be skipped prior to data collection. A maximum
of 64K samples can be skipped
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