7-2
IM 253710-01E
Explanation
The trigger mode is used to set the conditions for updating the display. Select the trigger
mode from the following choices.
• OFF : Sets the trigger mode to OFF.
The display is updated regardless of whether or not the trigger conditions are met.
When set to OFF, the other menus in the Trigger setting menu are not displayed.
• Auto : Sets the trigger mode to auto.
• The waveform is updated when a trigger occurs within the timeout period (approx.
100 ms).
• If the trigger does not occur within the timeout period, the waveform display is
automatically updated when the timeout period elapses.
When the period of the trigger signal is greater than 100 ms, the above two conditions
are met alternately and the display is updated. In this case, set the mode to normal.
• AT-Level : Sets the trigger mode to auto-level mode.
• If a trigger occurs within the timeout period, the waveform is displayed in the same
way as in the auto mode.
• If a trigger does not occur within the timeout period, the center value of the
amplitude of the trigger source is detected, the trigger level is automatically
changed to the center value, and the trigger (edge trigger) is generated to update
the displayed waveform.
• Normal : Sets the trigger mode to normal mode.
• The display is updated when a trigger occurs.
• If a trigger does not occur, the display is not updated.
• HF Auto : Sets the trigger mode to HF auto.
• The output of the zero crossing detector of the trigger source is used to detect the
trigger condition. Because the trigger occurs when the trigger source crosses the
center level of the amplitude of the trigger source (with a hysteresis of approx.
3.5% of the measurement range) and the display is updated, the trigger level
setting (see section 7.3) is void.
• The behavior with respect to the timeout period is the same as in the auto mode.
• When the zero crossing filter is set, the trigger becomes less susceptive to
harmonic noise and unexpected triggers are prevented from occurring.
• The PZ4000 may not operate properly when the motor module is installed in the
element number 4 slot and the trigger source is set to CH7 or CH8.
• HF Normal : Sets the trigger mode to HF normal.
• The method in which the trigger is activated is the same as in the HF auto mode.
• The behavior with respect to the timeout period is the same as in the normal mode.
• The PZ4000 may not operate properly when the motor module is installed in the
element number 4 slot and the trigger source is set to CH7 or CH8.
Note
•
When the trigger mode is [AT-Level], edge trigger is the only trigger type available.
•
When the trigger mode is [HF Auto] or [HF Normal], edge trigger is the only trigger type
available. In addition, the trigger level cannot be set.
7.1 Selecting the Trigger Mode