Agilent Technologies InfiniiVision 4000 X-Series User Manual page 210

11
Trigger Mode/Coupling
5 Press the Range softkey; then, turn the Entry knob to set the External
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Trigger input signal range.
The range is either 1.6 V or 8 V when you are using a 1:1 probe.
The range is automatically recalculated when a different External
Trigger probe attenuation factor is chosen.
Agilent InfiniiVision 4000 X-Series Oscilloscopes User's Guide