156 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
11 Trigger Mode and Conditioning
3 From the Coupling drop-down list. select:
• 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 50 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 — Adds a high-pass filter with the 3-dB
point at 50 kHz in series with the trigger waveform.
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.
Note that Trigger Coupling is independent of Channel Coupling (see
"To specify
channel coupling"
on page 57).
Pass
Band
50 kHz
0 dB
3 dB down point
DC
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