Trigger
41
6.4 Trigger Coupling
To set the trigger coupling:
1. Press the Setup key to enter the
Trigger
menu.
2. Press the
Coupling
softkey to display the available options.
3. Turn the Universal Knob or press the
Coupling
softkey continually to navigate the available modes.
4. Push the Universal Knob to set the selected mode.
Note:
Trigger coupling has nothing to do with the channel coupling.
The oscilloscope provides 4 kinds of trigger coupling modes:
Figure 6.4
Trigger Coupling
DC
Allows both AC and DC components of the waveform into the trigger path.
AC
Blocks all the DC components and attenuate signals lower than 8 Hz. Use AC coupling to get a stable edge trigger when
your waveform has a large DC offset.
LF Reject
Block the DC components and reject the low frequency components lower than 2 MHz. Low frequency reject removes
any unwanted low frequency components from a trigger waveform, such as power line frequencies, etc. that can interfere
with proper triggering. Use LF Reject coupling to get a stable edge trigger when your waveform has low frequency noise.
HF Reject
Reject the high frequency components higher than 1.2 MHz.
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