Triggering 4
InfiniiVision 7000B Series Oscilloscopes User’s Guide 103
Trigger Coupling
1 Press the [Mode/Coupling] key.
2 Press the Coupling softkey, then select DC, AC, or LF Reject coupling.
• DC coupling allows DC and AC signals into the trigger path.
• AC coupling places a 10 Hz high-pass filter in the trigger path
removing any DC offset voltage from the trigger waveform. The
high- pass filter in the External Trigger input path is 3.5 Hz for all
models. Use AC coupling to get a stable edge trigger when your
waveform has a large DC offset.
• LF (low frequency) Reject coupling places a 50 kHz high- pass filter in
series with the trigger waveform. Low frequency reject removes any
unwanted low frequency components from a trigger waveform, such
as power line frequencies, that can interfere with proper triggering.
Use this coupling to get a stable edge trigger when your waveform
has low frequency noise.
• TV coupling is normally grayed-out, but is automatically selected
when TV trigger is enabled in the Trigger Menu.
Note that Trigger Coupling is independent of Channel Coupling. To change
Channel Coupling see page 79.
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