Teledyne LeCroy WaveExpert 100H Operators Manual User Manual
Page 91
Wave Expert
WE-OM-E Rev A
89
TRIGGERING
Trigger Setup
Trigger Setup Considerations
Trigger Modes
Auto mode causes the scope to sweep even without a trigger. When there is no trigger signal
present at the selected trigger input, the internal clock generates a sampling strobe at a rate of 1M
samples per second when the sequential timebase is selected and 10 MS/s when the CIS timebase
is selected (if available).
In Normal mode, the scope acquires data only when a trigger signal is present at the selected
trigger input. Otherwise, it continues to display the last acquired waveform.
In Single mode, the scope will acquire data if a trigger signal is present at the selected trigger input.
The scope acquires one sample per trigger in sequential mode until the number of samples
indicated in the horizontal descriptor box has been acquired; then the acquisition stops. When the
CIS timebase is selected (if available), the selected number of samples is acquired at a 10 MHz
sampling rate before the acquisition stops.
Stop mode inhibits all acquisitions until you select one of the other three modes.
Trigger Types
The triggers available to you are defined as follows:
Direct trigger. This button selects the Trigger input on the instrument front panel as the
timebase trigger. The trigger signal is DC coupled and includes slope and level
controls. The Trigger input will respond to trigger signals up to 5 GHz. This input is also
used for the CIS timebase only for trigger signals below 125 MHz rate.
This button selects the Prescale input on the instrument front panel as the trigger signal
for the timebase. The prescale input is AC coupled and has no level or slope controls.
This is also the clock input for the CIS timebase for clock rates above 125 MHz. The
Prescale input responds to clock and trigger signals up to 14 GHz
The TDR trigger is an internal, free-running clock that is used to drive the TDR step
generator in the ST-20 module at the same time as the sampling strobe. This button
cannot be selected in the trigger menu; rather, it is activated when the TDR mode is
selected in the timebase "Horizontal" menu.