LeCroy DDA 7 Zi series, Руководство оператора

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WavePro 7Zi
209
WP700Zi-OM-E-RevA
If the sampling rate (SR) is insufficient to resolve the signal adequately, based on the bit rate (BR) setup or clock
frequency, then the protocol decoding will be turned OFF in order to protect the operator from incorrect data. The
minimum SR:BR ratio required is 4:1. It is suggested that you use a slightly higher SR:BR ratio if possible, and
use significantly higher SR:BR ratios if you want to also view perturbations or other anomalies on your serial data
analog signal.
Table Display
The tabular display of serial decoded data is a powerful feature to allow you to see all of your protocol messages,
even if the compaction of serial data messages on the oscilloscope grid means that annotation is impractical. The
table uses as its source the decoded data, extracted as described above. Therefore, if
View Decode is not
checked ON, then the table will not be displayed.
Accessing Overview
TD trigger and decoding tools are easily accessible in a variety of ways. The TD options add an additional Serial
selection to the "Trigger Type" menu in the Trigger dialog, and a new set of dialogs for Decode setup. These
dialogs are shared by all the low-speed serial protocols that LeCroy offers, so all serial trigger and serial decoding
selections will be grouped into a common selection with nearly identical selection and setup. These dialogs are
conveniently accessed with just one or two touches of the screen.
Trigger
Methods to access the Serial Trigger dialogs are listed below:
Touch the Trigger descriptor label. Then select the Serial trigger type
in the dialog box.
Touch Trigger in the menu bar, and select Trigger Setup... from the drop-
down menu. Then select the Serial trigger button and choose the
appropriate serial trigger.
Serial Decode and Decode Setup
These dialogs provide the ability to set the oscilloscope up for protocol decoding of serial data messages, with
display of the protocol data overlaid on the signal. They also allow quick and easy access to oscilloscope
zooming, searching, table display, and table export.
The serial decode and decode setup dialogs are accessed in any the following ways:
Touch Analysis in the menu bar, and select Serial Decode... from the drop-
down menu. This will open the Serial Decode summary dialog, and provide
access to Decode Setup .