Trigger Functions
When a valid tri
gger signal is found, the trigger button will be lit and the trigger
parameters appear in white.
When no trigge
r is found, the trigger p arameters appear in gray, and the button
backlight will be off.
The followi
ng image shows an example of a trigger delay of 500 ms (top) and an
example of a pretrigger view o f 8 divisions (bottom) . (See Figure 3 2.)
Figure 3
2: Trigger delay or pretrigger view
Set Automatic Trigger
In the trigger menu, you can change settings for a utomatic triggering as follows:
1. Press the Trigger button.
2. Select TRIGGER O PTIONS from the menu.
3. Select Automatic Auto Level.
4. Sel
ect the trigger threshold: > 15 Hz or > 1 Hz. If the frequency range of the
automatic triggering is set to >15 Hz, the Autoset function responds more
quickly because the instrument is instructed not to analyze low frequency
signal components. However, when you measure frequencies lower than
15 Hz, you need to select > 1 Hz to analyze low frequency components for
automatic triggering.
64 THS3000 Series Oscilloscopes User Manual
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