LeCroy DDA 7 Zi series, Operator'S Manual

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Operator's Manual
WP700Zi-OM-E-RevA
30
NumberDescription
Start Stop provides another way to adjust the position of the FFT zoom trace. You can specify the
Starting and Stopping Frequencies
3
Resolution Bandwidth is equivalent to changing the Timebase setting to increase or decrease memory
in FFT mode. Reducing the Resolution Bandwidth equals more memory. The Spectrum Analyzer reports
back adapted values for the resolution bandwidth if the value entered is not achievable.
4
There are three modes: Normal , Average , and Max Hold . In Averaging mode, you can enter the number
of spectra to be averaged. Averaging is effective in reducing the noise of the signal to see more of the
harmonic or carrier detail. Max (Peak) Hold mode is useful for swept frequency measurements where it
shows the history of peak values across the frequency axis. Max Hold shows the maximum level the
signal reaches. it is also useful for finding infrequent spurs.
5
Reference Level sets the amplitude of the top of the screen. Scale is the same as adjusting the Vertical
Gain knob in FFT mode.
6 Using Markers , you can set the reference frequency and display a marker for the center frequency.
7
Show Peaks lets you label and tabulate peaks. When Show Peaks is checked, the significant peaks are
marked with a frequency and gain stamp and a table listing the peaks, ordered by amplitude from highest
to lowest is displayed. This is very useful in identifying harmonics or peaks that may be hidden due to
poor resolution.
TriggerScan
TriggerScan is a debugging tool that helps you quickly find rare waveform glitches and anomalies. With
TriggerScan, you can build a list of trigger setups to look for rare events and automatically sequence through
each one. TriggerScan can use any type of trigger setup available including edge, width, and qualify as well as
Smart Triggers (such as, glitch and runt triggers). TriggerScan automates two key processes in triggering rare
events:
1. Trains the system by looking at normal acquired waveforms. During the training, the oscilloscope analyzes
the waveforms to determine what waveforms normally look like. Using this information, it generates a list of
smart trigger setups to trigger on abnormal situations.
2. Loads the smart trigger setups from the Trainer and cycles through these. As triggers occur, they are
overlaid on the screen. All acquisition settings are preserved and you can use all the functions of the
oscilloscope to find the root cause of these anomalies including, WaveScan, Histograms, and advanced
analysis.