124 Keysight InfiniiVision 1200 X-Series and EDUX1052A/G Oscilloscopes User's Guide
12 Trigger Mode/Coupling
Often with single-shot acquisitions, you must initiate some action in the device
under test, and you don't want the oscilloscope to auto-trigger before that
happens. Before initiating the action in the circuit, wait for the trigger condition
indicator Trig'd? to flash (this tells you the pre-trigger buffer is filled).
See Also • "Forcing a Trigger" on page 99
• "To set the trigger holdoff" on page 126
• "To position the time reference (left, center, right)" on page 46
To select the trigger coupling
1 Press the [Trigger] key.
2 In the Trigger menu, press the Coupling softkey; then, turn the Entry knob to
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.
Pass
Band
50 kHz
0 dB
3 dB down point
DC
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