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Question

Difficulty: MediumOscilloscopes

An electronics technician is troubleshooting an intermittent circuit fault using an analog/digital oscilloscope. Match each oscilloscope control feature on the left with its correct functional operation on the right.

  • Trigger LevelSets the voltage threshold that initiates the horizontal sweep to stabilize a repetitive waveform.
  • AC CouplingInserts a series capacitor to block DC bias voltage and display only small AC ripple components.
  • Timebase (SEC/DIV)Controls the horizontal sweep speed to adjust the displayed duration per graticule division.
  • Vertical PositionShifts the baseline trace upward or downward on the screen without changing signal amplitude.

Answer

Trigger Level matches setting the voltage threshold to stabilize the sweep; AC Coupling matches inserting a series capacitor to block DC bias; Timebase (SEC/DIV) matches controlling horizontal sweep speed per division; Vertical Position matches shifting the trace vertically without changing signal amplitude.
Each control corresponds directly to its front-panel function: Trigger Level establishes the voltage threshold for horizontal sweep synchronization; AC Coupling blocks DC bias using an internal capacitor to view small AC variations; Timebase dictates horizontal sweep speed per division; and Vertical Position shifts the trace vertically for convenient graticule alignment.

Step-by-Step Solution

1
Identify the synchronization function of the oscilloscope.
Trigger Level sets the precise voltage threshold required to synchronize the horizontal sweep generator with the incoming signal.
Without proper trigger settings, periodic waveforms scroll or overlap asynchronously on the screen.
2
Identify the input filtering configuration.
AC Coupling engages an internal series capacitor to block steady DC levels while passing time-varying AC signals.
This allows small AC fluctuations (such as power supply ripple) to be viewed at high vertical sensitivity without driving the trace off-screen.
3
Identify the horizontal time-domain scaling control.
Timebase (SEC/DIV) calibrates the horizontal rate of trace movement across graticule divisions.
Adjusting SEC/DIV allows the user to expand or compress the horizontal waveform display to measure period and frequency.
4
Identify the trace alignment control.
Vertical Position relocates the waveform baseline up or down across the vertical graticule.
This provides visual alignment against graticule reference lines without modifying vertical gain (Volts/Div).

Key Concept

Oscilloscope Front-Panel Controls and Signal Conditioning
Estimated Time:1m 15s
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Topics

Oscilloscopes

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