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Triggering on Waveforms
TDS 500C, TDS 600B, & TDS 700C User Manual
3–75
You can change the holdoff time and select the trigger mode using this menu
item. See Trigger Modes and Trigger Holdoff beginning on page 3–65 for a
description of these features. To set mode and holdoff, do the following steps:
1. Press the TRIGGER MENU ➞ Mode & Holdoff (main) ➞ Auto or
Normal (side). The modes operate as follows:
H In Auto mode the oscilloscope acquires a waveform after a specific time has
elapsed even if a trigger does not occur. The amount of time the oscilloscope
waits depends on the time base setting.
H In Normal mode the oscilloscope acquires a waveform only if there is a valid
trigger.
2. To change the holdoff time, press Holdoff (side). Enter the value in time
using the general purpose knob or the keypad.
If you want to enter a large number using the general purpose knob, press the
SHIFT button before turning the knob. When the light above the SHIFT button
is on and the display says Coarse Knobs in the upper right corner, the general
purpose knob speeds up significantly.
You can set holdoff from 250 ns (minimum holdoff available) to 12 seconds
(maximum available). See Holdoff, Variable, Main Trigger in the TDS 500C,
TDS 600B, & TDS 700C Oscilloscopes Performance Verification and Specifica-
tions manual for typical minimum and maximum values.
3. To change to the factory default holdoff setting for the current horizontal
scale setting, press Default Holdoff (side).
NOTE. If you select Default Holdoff, the default holdoff time will vary with the
horizontal scale setting to maintain a good value for general purpose triggering
at that scale. However, if you select Holdoff (as opposed to Default Holdoff), the
time set in the Holdoff menu item is used at all horizontal scale settings.
To select the slope that the edge trigger will occur on:
1. Press the TRIGGER MENU ➞ Type (main) ➞ Edge (pop-up) ➞
Slope (main).
To Set Mode & Holdoff
To Set Slope