No. 11 : Frame - Rare Pulse - Metrix HX0074 Guia Del Usuario

Demo: with:
Test Signal
Specs
Scope Settings
Trigger
Modes
Purposes
a) Firstly calibrate the Oscilloscope to provide a rough view of the signal (possible using Autoset), then set the
parameters as indicated below.
b) The signal displayed corresponds to a digital clock at 100ns.
If close attention is paid, it is possible to notice a certain instability on some signal edges.
b) Now calibrate the timebase speed to 25ns/div.
Select the "SPO Persistence" display mode in the "Display" menu.
Set the persistence duration to 1 or 2s to obtain the visualisation on the left below.
The glitch is fairly rare and only occurs on one clock cycle in a thousand, but it is captured and visualised
immediately and can therefore be analysed.
It is constituted by a brief pulse less than 10ns in duration, adjacent to the clock wave falling edge.
Return to "Oscilloscope" display mode in the "Display" menu.
The glitch is not visible and is only manifested by intermittent instability on edges.
SPO mode: observation of the rare event
30 - Chapter II
MTX3x5x SPO OX 6000
& MTX105x SPO
OX 6000-II
no. 11 : Frame + rare pulse
Type Digital clock signal presenting a glitch
F clock ≈ 5 MHz, Vpp ≈ 3.3 V
100 or 125 ns/div. then 25 ns/div. - MAIN = 50 0mV/div. DC coupling
⇑ DC coupling on MAIN, level ≈ 1.8 V
Triggered mode preferred, SPO duration mode 1 or 2 s
Acquisition and display of a rare glitch using SPO mode
Possible pulse-width trigger < 20ns, after SPO analysis
Oscilloscope Mode : no fault visible
SCOPIX HANDSCOPE
METRIX Oscilloscope Demo Kit