158 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
11 Trigger Mode and Conditioning
3 Select the HF Reject check box to enable or disable.
To disable or reenable trigger hysteresis
Oscilloscope triggers use hysteresis techniques to reduce false triggering on noisy
signals. This oscilloscope's fully digital triggers implement hysteresis as a
sensitivity limit. The default hysteresis setting (enabled) delivers optimal triggering
performance for almost all signals.
By disabling hysteresis, the sensitivity of the trigger drops to one least significant
bit (LSB). It is limited only by the noise floor of the signal and oscilloscope. You
must be mindful of signal and measurement noise to avoid false triggers. This
mode is often paired with Bandwidth Limit filters or Averaging (see "Selecting a
Global Bandwidth Limit and Vertical Resolution" on page 171 or "Averaging
Acquisition Mode"
on page 169).
1 Open the Conditioning dialog box by selecting Conditioning... in the Trigger
dialog box or by choosing choose Trigger > Conditioning... from the main menu.
2 In the Conditioning dialog box, select the Coupling tab.
3 Clear or select the Hysteresis check box to disable or reenable.
To set the trigger holdoff
Trigger holdoff sets the amount of time the oscilloscope waits after a trigger
before re-arming the trigger circuitry.
Use the holdoff to trigger on repetitive waveforms that have multiple edges (or
other events) between waveform repetitions. You can also use holdoff to trigger on
the first edge of a burst when you know the minimum time between bursts.
For example, to get a stable trigger on the repetitive pulse burst shown below, set
the holdoff time to be >200 ns but <600 ns.
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