Triggering
3-48 CSA8000B & TDS8000B User Manual
Use the procedure that follows when setting up the instrument to trigger
acquisitions.
Overview To trigger Control elements and resources
Prerequisites 1. The instrument must be installed with sampling modules
in place. Acquisition system should be set to Run, and
the vertical and horizontal controls should be set
appropriately for the signal to be acquired.
See Sampling Module User Manuals for sampling module
installation. See page 3--24 of this manual for acquisition
setup.
Apply a trigger
signal
2. Connect the signal to be triggered on using proper
probing/connecting techniques for your application.
Typical approaches include using:
HExternal Trigger, Direct or Prescale. Portion of the
input signal coupled to the appropriate input (see
right) using a power divider on input signal.
HInternal Clock. No external trigger required.
HClock Recovery. Recovered clock signal obtained
from those optical sampling modules supporting
clock recovery (connection internal through the
sampling module; no external trigger connection
required).
A custom clock recovery rate can be defined by the
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user if the opti
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ontinuous-
rate clock recovery. Refer to Sampling Modules
Supported on page 1--4 to see those modules that
support continuous-rate clock recovery.
Note. When using any of the above sources, disconnect
any signal connected to the other source trigger and
clock sources. See External 10MHz Reference Input
when using the Internal clock).
See Table 3--1 on page 3--43 for more information.
Select source,
slope, and
level
3. Click the Trig Source menu, and select the trigger
source to match your trigger signal in the pull-down
menu (upper right corner of display).
4. Click the Slope button to toggle to the trigger slope you
want, positive or negative.
5. Adjust the trigger level using the (Set Level to) 50% button
or the Level list box as show at right, or using those on
the front panel, shown in step 7.
Source Menu Slope button
Level Controls