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Delayed Triggering
TDS 620A, 640A, & 644A User Manual
Delayed Triggerable
You must make sure that the Main Trigger menu settings are compatible with
Delayed Triggerable.
1. Press TRIGGER MENU.
2. If Type is set to Logic, press Type (main) to change it to either Edge or
Pulse as fits your application. Logic type is incompatible with Delayed
Triggerable.
3. If Source is set to Auxiliary (not available on the TDS 524A &
TDS 620A), press Source (main). Select any source other than Auxiliary
from the side menu according to your application.
4. Press HORIZONTAL MENU ➞ Time Base (main) ➞ Delayed Only
(side) ➞ Delayed Triggerable (side).
NOTE
The Delayed Triggerable menu item is not selectable unless incom-
patible Main Trigger menu settings are eliminated. (See the steps at
the beginning of this procedure.) If such is the case, the Delayed
Triggerable menu item is dimmer than other items in the menu.
By pressing Intensified (side), you can display an intensified zone that
shows where the delayed timebase record
may
occur (a valid delay
trigger event must be received) relative to the main trigger on the main
time base. For Delayed Triggerable After mode, the start of the intensified
zone corresponds to the possible start point of the delayed time base
record. The end of the zone continues to the end of main time base, since
a delayed time base record may be triggered at any point after the delay
time elapses.
To learn how to define the intensity level of the normal and intensified
waveform, see
Display Modes
on page 3-28.
Now you need to bring up the Delayed Trigger menu so you can define
the delayed trigger event.
5. Press SHIFT DELAYED TRIG ➞ Delay by (main) ➞ Triggerable After
Time, Events, or Events/Time (side) (Figure 3-15).
6. Enter the delay time or events using the general purpose knob or the
keypad. If you selected Events/Time, use Time (side) and Events (side)
to switch between setting the time and the number of events.
Hint: You can go directly to the Delayed Trigger menu (see step 5). By
selecting one of Triggerable After Time, Events, or Events/Time, the
oscilloscope automatically switches to Delayed Triggerable in the Hori-
zontal menu. You will still need to display the Horizontal menu if you wish
to leave Delayed Triggerable.