Tektronix MSO46 — настройки триггера параллельной шины: руководство пользователя [484/628]

Parallel serial bus trigger settings panel. Parallel bus triggering is standard on all instruments. Mode & Holdoff panel (Bus

Trigger configuration panel) fields and controls

Field or control Description

Source Select the type of information on which to trigger.

Data Sets the data pattern on which to trigger. The number of bits shown depends on how the

parallel bus is defined.

Tap the Binary or Hex field and use the A and B knobs to select and change the values. Or

double-tap on the field and use the virtual keypad to enter values.

A, B knob controls Use the A knob to select (highlight) the digit(s) to change.

Use the B knob to change the value of the digit(s).

Field or control Description

Trigger Mode The trigger mode determines how the instrument behaves in the absence or presence of a

trigger event:

Auto trigger mode enables the instrument to acquire and display a waveform even if a trigger

does not occur. Auto mode uses a timer that starts when the acquisition is started, and the

pretrigger information is obtained. If a trigger event is not detected before the timer times out,

the instrument forces a trigger. The length of time it waits for a trigger event depends on the

time base setting.

When forcing triggers in the absence of valid triggering events, Auto mode does not

synchronize the waveform on the display. The waveform will appear to jump across the screen.

If valid triggers occur, the display will become stable.

Normal trigger mode enables the instrument to acquire a waveform only when it is triggered. If

no trigger occurs, the last waveform record acquired remains on the display. If no last waveform

exists, no waveform is displayed.

Force Trigger Forces a trigger event regardless of whether the waveform meets any trigger conditions.

Holdoff Trigger holdoff sets the amount of time the oscilloscope waits after a trigger event before

detecting and triggering on the next trigger event.

Random sets the instrument to wait for a random amount of time before recognizing another

trigger event. This means that successive acquisitions are unrelated to the previous trigger

signal.

Time sets the instrument to wait the specified time before recognizing another trigger event.

Use this option when the signal that you want to trigger on has several possible trigger points or

is a burst signal.

Holdoff Time Tap the Holdoff Time field and use the multipurpose knob to adjust the holdoff time value. Or

double-tap the field and use the virtual keypad to enter a time holdoff period.

Menus and dialog boxes

454 4/5/6 Series MSO Help