2-14 IM 701450-01E
HF Rejection <For the setup procedure, see sections 6.5, 6.8 to 6.12>
Turn HF rejection ON when eliminating high frequency components above 15 kHz or 20
MHz from the trigger source. This prevents triggers from being activated at unexpected
points due to the effect of high frequency noise.
Trigger Hysteresis <For the setup procedure, see sections 6.5, 6.8 to 6.12>
If there is insufficient trigger level width and noise is present in the trigger source, the
trigger point fluctuates each time a trigger is activated. This causes the displayed
waveforms to be unstable. Therefore, a given margin (hysteresis) is added to the
specified trigger level. You can select
(narrow hysteresis) or (wide hysteresis)
on the DL7400. When set to , the hysteresis is set wide reducing the fluctuation of
the trigger point caused by noise. Thus, a stable waveform display is achieved.
However, this setting tends to make the trigger point ambiguous. On stable waveforms
without noise, set the hysteresis to
to make the trigger point more accurate.
Trigger is activated
Hysteresis width
Trigger Hold Off <For the setup procedure, see section 6.4>
The trigger hold-off function temporarily stops detection of the next trigger once a trigger
has been activated. This function is useful when observing a pulse train signal, such as
a PCM code and you wish to display the waveform in sync with repetitive cycles; or when
using the history memory function described later (see page 2-17) and you want to
change the waveform acquisition period.
Input signal
Repetition period T
Trigger level
Trigger source
signal
t
Trigger signal limited by hold time t (when the trigger slope is set to rising edge)
Action-on-Trigger <For the setup procedure, see section 6.16>
A specified action can be executed each time a trigger is activated. You can select from
various actions including sounding of a buzzer, saving of waveform data or screen image
data, printing of screen image data, or transmission of e-mail messages (when the
Ethernet interface option is installed).
Trigger Gate <For the setup procedure, see section 6.17>
You can control whether to enable a satisfied trigger condition using an external signal.
You can also select the status of the external signal that enables the satisfied trigger
condition.
2.3 Trigger
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