Agilent Technologies DSO-X 4022A, User Manual

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208 Agilent InfiniiVision 4000 X-Series Oscilloscopes User's Guide
11
Trigger Mode/Coupling
See Also • "Forcing a Trigger" on page 167
• "To set the trigger holdoff" on page 210
• "To position the time reference (left, center, right)" on page 73
To select the trigger coupling
1 Press the [Mode/Coupling] key.
2 In the Trigger Mode and Coupling 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.
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.
Pass
Band
50 kHz
0 dB
3 dB down point
DC