Axis 1620 Manual do Utilizador descarregar pdf (Página 29)

1-12

IM 701610-01E

HF Rejection <Sections 6.5, and 6.8 to 6.13>

Set HF rejection to ON when you want to remove high frequencies exceeding 15 kHz

from the trigger source. This prevents a trigger from being activated unexpectedly due to

high-frequency noise.

Trigger Hysteresis <Sections 6.5, and 6.8 to 6.13>

If the trigger level width is not sufficient, the trigger point fluctuates each time a trigger is

activated if noise is present in the trigger source, thereby resulting in unstable displayed

waveforms. To solve this problem, a specified margin (hysteresis) can be added to the

selected trigger level.

The hysteresis level can be chosen from “ ” and “ .” If “ ” is selected, a wide

hysteresis level is provided to eliminate fluctuation in the trigger point, thereby resulting

in a stable displayed waveform. However, in this case, the trigger points become

uncertain. Thus, select “

” if you want to activate a trigger to detect small fluctuations

in a waveform.

Trigger is activated

Hysteresis Width

Trigger Source and Trigger Level <Sections 6.5 to 6.13>

Trigger Source: Selects the signal for the selected trigger type. The external trigger

signal or the commercial power supply signal can also be used a trigger

source.

Trigger Level: Sets the voltage level used to judge trigger conditions such as trigger

slope (rise/fall of a signal).

Trigger Hold-Off <Section 6.4>

The trigger hold-off function temporarily stops detection of the next trigger once a trigger

has been activated. For example, when observing a pulse train signal, such as a PCM

code, display of the waveform can be synchronized with repetitive cycles; or when using

the history memory function, you may want to change the repetitive period, as shown

below.

Input Signal

Repetitive Period: T

Trigger Level

Trigger Ssource

Signal

Trigger Signal Restricted by Hold-Off Time “t” (When “Rise” is selected as the trigger slope)

1.3 Setting a Trigger

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Axis 1620 Manual do Utilizador Página 29