244 Keysight M8000 Series of BER Test Solutions User Guide
4 User Interface - M8020A Display Views
This will allow an interactive user to observe the oscilloscope's display
and adjust settings in case warning messages are shown on the
oscilloscope display.
• Take advantage of the possibility to operate the oscilloscope's local
user interface while the acquisition is disabled. But be aware that
M8070A is not detecting local changes and is not updating its
parameters accordingly. Use the Reconfigure function to re-apply the
setting as defined in M8070A to synchronize the settings of M8070A
and Infiniium.
• When measuring jitter tolerance, configure the number of bits per
acquisition to minimum.
The jitter tolerance measurement is always doing a pass/fail
measurement and is collecting acquisitions until the required
measurement depth is reached. If the error distribution can be
assumed to be random, then it is safe to reduce the bits per acquisition
in order to achieve a better responsiveness of the setup.
• If the measurement setup can provide a high precision reference clock
(e.g. from the pattern generator being used), then better results can be
achieved if this reference is used as the reference for the horizontal
time base of the oscilloscope. This is especially true for high symbol
rates.
When using a M8045A as pattern generator, the Ref Clk Out can be
configured to 100 MHz and connected to the 100 MHz in connector of
the oscilloscope. When this is done, select the External Reference
Clock as 100 MHz.
Remote controlling the real-time oscilloscope based error detector
This section provides an overview of the SCPI commands that are relevant
for controlling an error detector that is based on a real-time oscilloscope.
Many of the commands listed below are also valid for other error detector
channels, except for those that configure the acquisition, clock recovery
and equalizer parameters.
It is good practice to stop the acquisition manually, when changing
multiple parameters and only enable the acquisition, once the parameters
are all configured. This avoids that M8070A will automatically stop and
restart the acquisition with every parameter that is getting programmed.
Additionally, the remote program must to use large enough VISA timeouts
that cover the time that it takes to stop acquisition, or auto-set functions
that have been initiated. This is important when reprogramming
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