5
2. HYSTERESIS
Demo: with:
DOX2025
DOX2040
DOX2100
DOX2xxxB
Test Signal
n°2 : Hysteresis
Nature
2 phase-shiffed signals, triangle and pseudo-square
Specs
Vpp ≈ 3.2 V - F ≈ 1.7 kHz - square wave ≈ 24 µs - signal delay ≈ 40 µs
Oscilloscope Settings
100 µs/div. - CH1 = MAIN = 500 mV/div. - CH2 = AUX = 500 mV/div.
Trigger
standard on MAIN
Modes
XY (Display menu) - no «Min/Max», and no «Repetitive Signal» (Horizontal menu)
Objectives
«y(t)» and «XY» modes from phase-shiffed signals
Present automatic measurements with markers (F, square-wave Tr)
Present phase measurements (manual, automatic)
Present the FFT Mathematical function
a) Adjust the oscilloscope so as to display the signals correctly (possible using the «Autoset» key) and select automatic phase measurement to
determine the phase difference between the signals Main = CH1 and Aux = CH2.
b) Select the XY mode with CH1 on X and CH2 on Y.
The display of a hysteresis cycle is a “textbook case” often encountered in the educational context. It demonstrates the utility of display in the y(t)
and XY mode(s), respectively.
Stress the simplicity of access to the XY mode, and of access to automatic phase measurement.
c) Return to «y(t) mode» in order to demonstrate the use of the automatic measurements. (Ex.: Vpp, Vamp, Feq, Rise, ...).
