Triggering
3-60
TDS5000 Series User Manual
Overview Control elements and resourcesAdditional trigger parameters
Select a
preset trigger
level
5. Push the front-panel ADVANCED button.
6. On the Trigger Setup control window, select the A Event
tab.
7. Click a Trigger Type button to select a trigger, such as
Edge, that uses a level adj ustment. A trigger uses a
level adjustment if the Level control appears on the right
side of the screen with the trigger type setup controls.
8. Click on Level and click on the keypad icon to open the
keypad. Click on either TTL, ECL, or USER:
H TTL fixes the trigger level at +1.4 V.
H ECL fixes the trigger level at --1.3 V.
H USER fixes the trigger level at a user preset
voltage (see Steps 9 through 12).
When you set the volts/div smaller t han 200 mV, t he
oscilloscope reduces the TTL or ECL trigger levels
below standard TTL and ECL levels. This reduction
occurs because the trigger level range is fixed at ±12
divisions from the center. At 100 mV (the next smaller
setting after 200 mV) the trigger range is ±1.2 V, which
is smaller than the typical TTL (+1.4 V) or ECL (--1.3 V)
level.
Define new
trigger l evel
presets
9. If the menu bar is not displayed, click the Menu toolbar
button.
10. Select the Utilities menu User Preferences option. The
User Preferences control window opens.
11. Select the Keypad Defaul ts tab.
12. Click on the appropriate Trig Level and adjust the preset
using the multipurpose knob or pop-up keypad.
13. If desired, click on a Keypad Label and change the label
of the preset using the pop-up keyboard.
To Next Page
Loading...
Need help?
General
