12
6. AMPLITUDE-MODULATED SINE WAVE
Demo: with:
DOX2025
DOX2040
DOX2100
DOX2xxxB
Test Signal
n°6 : Amplitude-modulated sine wave
Nature
1 amplitude-modulated sinusoidal signal
Specs
1.3 V < Vpp < 3.3 V - F ≈ 1.3 kHz
Oscilloscope Settings
100 µs/div. - MAIN = 500 mV/div.
Trigger
on MAIN, 50 % of Vpp
Modes
Triggered mode preferable-«Delayed» Mode
Objectives
Display a fast-changing signal (e.g., modulation)
Automatic «difference from reference» measurements
Using the Delayed mode and the automatic peak amplitude measurement, we can observe the global shape of the signal and a zoomed zone.
The measured amplitude (Vpp) of the signal in the zoomed zone is displayed on the right side of the screen. By shifting the zoom window using
the “Horizontal position” button, we can determine the variation of the amplitude of the AM signal vs time.
Adjust the oscilloscope so as to display the signals correctly (possible using “Autoset” function).
Persistence «Off»
Persistence Infinite
Difference from reference
We can press the “REF” key to record the signal on one of the 2 channels as
reference, then validate this reference by “On” and observe the variations
of the real-time signal of the channel with respect to the frozen reference.
