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7.0: TROUBLESHOOTING
The following tests and solutions are meant to assist with basic troubleshooting. Contact
if these fixes fail to address the problems with your system.
C
S
USTOMER
ERVICE
7.1 Freq. Plots and Raw Data Time Series Analysis Using J-STAR
The ability of the J-STAR program to request and display raw data (directly from the ADC converter) is
invaluable in diagnosing many potential failure modes. Raw data (as opposed to processed and CHIRPed
data) allows direct interpretation (via scope like display). This helps to determine noise levels, and the
proper operation of, transmit power electronics. The J-STAR program also assists interpretation with FFT
analysis that show interfering noise sources by frequency distribution and spectral amplitude.
The J-STAR program may also be used to acquire raw data, and log this data to disk for offline analysis.
Having recorded raw data available for analysis by EdgeTech engineers will often speed up the resolution
of suspected problems. Such files may be sent to EdgeTech in USB or if small as email attachments. Many
system control and setup parameters are recorded in these raw data files which will assist in problem
diagnosis.
The Graph tab on the Control Panel will display any channel of data and its FFT (frequency spectrum).
1. Start J-STAR
2. Turn pinging on
3. Go to the Graph Tab in the Control Panel
4. You should now see something like
F
7-1
show a typical raw data display for a side scan channel. The left half of the graph display shows
IGURE
one thousand samples of the raw ADC (analogue to digital converter) output, plotted as time vs. amplitude
on the X –Y axes.
The right half shows a frequency analysis (FFT) of the time series in the top half. The axes are Frequency
(Hz) vs. Amplitude (x - y).
This raw data display was obtained by first setting the sub-bottom system to send raw data (as opposed
to de-CHIRPed envelope data).
F
7-1.
IGURE
7-1
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T
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Table of Contents
Troubleshooting
