DSO5000 Series Quick Start Guide

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4.4 To set marks

Mark at some waveform record locations that users are interested in, and searches for these marks by right and left arrows. Then it positions the window to this mark for further observation.

? If the it a full screen display (single-window), press F7 to display dual-windown.

? Turn the horizontal POSITION knob to locate the portions of the waveform.

? Press Set/Clear softkey to set marks.

? Press right arrow or left arrow softkeys to search these marks to view the marked locations waveforms.

? Press Clear All and Set/Clear softkeys to remove the marks.

NOTE The mark function only valid in dual-window mode.

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4.5 To adjust the trigger holdoff

? Press HORIZ MENU.

? Press F6 turn to page 2/2.

? Press Holdoff softkey.

? Turn the multi-functional knob to adjust the trigger holdoff time within the range of 100ns-10s.

? Push the multi-functional knob to reset the holdoff time with the starting value 100ns.

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4.6  Auto display

Push the Play/Stop softkey to move the waveforms automatically from left to right at a specified speed. In the expanded window will display corresponding waveforms until it stops once reaching the rightmost side of the major scan window.

NOTE The mark function only valid in dual-window mode.

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Section 5 Using the Trigger Controls

An oscilloscope’s trigger function is important to achieve clear signal characterization, as it synchronizes the horizontal sweep of the oscilloscope to the proper point of the signal. The trigger controls let you stabilize repeating waveforms and capture single-shot waveforms. By repeatedly displaying similar portion of the input signal, the trigger makes repeating waveforms appear static on the oscilloscope display.

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5.1 Adjusting the Trigger Level

The level control determines where on the edge the trigger point occurs.

5.1.1 To adjust the trigger level

? Turn the trigger LEVEL knob.

Two things happen:

l  The trigger level value is displayed at the bottom center of the screen.

l A line is displayed showing the location of the trigger level with respect to the waveform (except when using AC coupling or LF reject coupling modes).

? Push the trigger LEVEL knob to set the level at 50% of the signal’s vertical amplitude.

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5.1.2  To force a trigger

To make an acquisition even if no valid trigger has been found:

? Press FORCE TRIG key.

Forcing a trigger is useful, for example, when you want to display the DC voltage of a level signal.

The FORCE TRIG key has no effect if the acquisition is already stopped.

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5.2 Choosing the Trigger Types

The trigger determines when captured data should be stored and displayed.

When a trigger is set up properly, it can convert unstable displays or blank screens into eaningful waveforms.

When the oscilloscope starts to acquire a waveform, it collects enough data so that it can draw the waveform to the left of the trigger point. The oscilloscope continues to acquire data while waiting for the trigger condition to occur. After it detects a trigger, the oscilloscope continues to

acquire enough data so that it can draw the waveform to the right of the trigger point.

The oscilloscope provides these trigger types:

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6. Press Mode and continue pressing the softkey to select the sweep to trigger on:

? Auto Cause the oscilloscope to sweep, even without a trigger. If no signal is present, a timer in the oscilloscope triggers the sweep. This ensures that the display will not disappear if the signal drops to small voltages. It is also the best mode to use if you are looking at many signals and do not want to bother setting the trigger each time.

? Normal The oscilloscope only sweeps if the input signal reaches the set trigger point; otherwise the screen is frozen on the last acquired waveform. Normal mode can be disorienting since you may not see the signal at first if the level control is not adjusted correctly.