DSO5000 Series Quick Start Guide

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7. Press Coupling and continue pressing the softkey to select the components of the trigger signal applied to the trigger circuitry:

?AC  Blocks DC components and attenuates signals below 10Hz.
?DC  Passes all components of the signal.
?Noise Reject  Eliminating noise from the trigger signal to prevent false triggering.
?HF Reject  Attenuates the high-frequency components above 80kHz.
?LF Reject  Blocks DC components and attenuates the low-frequency components below 8kHz.

NOTE Trigger coupling only affects the signal passed through the trigger system. It does not affect the bandwidth or coupling of the signal displayed on the screen.

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5.2.2  To set up video triggers

Video triggering is used to trigger on fields or lines of NTSC, PAL, or SECAM standard video waveforms.

When the video trigger mode is selected, the trigger coupling is set to AC.

1. Press TRIG MENU.

2. In the Trigger menu, press Type.

3. Continue pressing the Type softkey to select “Video”.

4. Press Source and continue pressing the softkey to select the waveform to trigger on:

? CH1 - CH2 The oscilloscope input channel.

? EXT The external trigger input.

? EXT/5 The (5:1) attenuated external trigger input.

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5. Press Polarity to toggle between:

?Normal trigger on the negative edge of the sync pulse.

?Inverted  trigger on the positive edge of the sync pulse.

NOTE Normal Polarity Sync triggers always occur on negative-going horizontal sync pulses. If the video waveform has positive-going horizontal sync pulses, use the Inverted Polarity selection.

6. Press Standard to toggle between:

? NTSC Trigger on an NTSC video waveform.

? PAL/SECAM Trigger on a PAL or SECAM video waveform.

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7. Press Sync and continue pressing the softkey to select what to trigger on:

? All Lines Trigger on all lines.

? Line Num Trigger on a selected line.

             If you select “Line Num”, turn the V0 knob to select the line number.

? Odd Field Trigger on an odd field.

? Even Field Trigger on an even field.

? All Fields Trigger on all fields.

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5.2.3  To set up pulse width triggers

A pulse width trigger occurs when a pulse that matches the pulse definition is found in a waveform.

1. Press TRIG MENU.

2. In the Trigger menu, press Type.

3. Continue pressing the Type softkey to select “Pulse”.

4. Press Source and continue pressing the softkey to select the waveform to trigger on:

? CH1 - CH2 The oscilloscope input channel.

? EXT The external trigger input.

? EXT/5 The (5:1) attenuated external trigger input.

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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.

? Normal The oscilloscope only sweeps if the input signal reaches the set trigger point; otherwise the screen is frozen on the last acquired waveform.

7. Press Coupling and continue pressing the softkey to select the components of the trigger signal applied to the trigger circuitry:

? AC  Blocks DC components and attenuates signals below 10Hz.

? DC  Passes all components of the signal.

? Noise Reject  Eliminating noise from the trigger signal to prevent false triggering.

? HF Reject  Attenuates the high-frequency components above 80kHz.

? LF Reject  Blocks DC components and attenuates the low-frequency components below 8kHz.

8. Press When and continue pressing the softkey to select the type of pulse to trigger on:

?  ＝ Pulse is equal to the width setting ±5%.

?  ≠  Pulse is not equal to the width setting ±5%.

?  >  Pulse is greater than the width setting.

?  <  Pulse is leass than the width setting.

NOTE The pulse width of the source must be ≥5ns so that the oscilloscope can detect the pulse.

9. Press Pulse Width and turn the multi-functional knob to adjust the width setting from 20 ns to 10 s.

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5.2.4  To set up slope triggers

1. Press TRIG MENU.

2. In the Trigger menu, press Type.

3. Continue pressing the Type softkey to select “Slope”.

4. Press Source and continue pressing the softkey to select the waveform to trigger on:

? CH1 - CH2 The oscilloscope input channel.

? EXT The external trigger input.

? EXT/5 The (5:1) attenuated external trigger input.

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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.

?  Normal The oscilloscope only sweeps if the input signal reaches the set trigger point; otherwise the screen is frozen on the last acquired waveform.

7. Press Coupling and continue pressing the softkey to select the components of the trigger signal applied to the trigger circuitry:

? AC  Blocks DC components and attenuates signals below 10Hz.

? DC  Passes all components of the signal.

? Noise Reject  Eliminating noise from the trigger signal to prevent false triggering.

? HF Reject  Attenuates the high-frequency components above 80kHz.

? LF Reject  Blocks DC components and attenuates the low-frequency components below 8kHz.

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8. Press Vertical to select the desired vertical window:

?  V1 Adjust the trigger level 1.

?  V2 Adjust the trigger level 2.

Use Multifunction Knob to adjust the trigger level. During the adjustment, two green trigger level lines and two trigger marks appear on the screen and move up and down with the rotation of the knob, while at the same time, the trigger level value is displayed at the lower left corner of the screen. When stopping turning the knob, the trigger level lines disappear in about 2 s.

9. Press When and continue pressing the softkey to select the type of slope time to trigger on:

?  ＝ Slope time of the input signal is equal to the specified time.

?  ≠  Slope time of the input signal is not equal to the specified time.

?  >  Slope time of the input signal is greater than the specified time.

?  <  Slope time of the input signal is less than the specified time.

10. Press Time and turn the Multifunction Knob to adjust the slope time to trigger on. The range available is from 20 ns to 10 s.

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