Logic glitch on Oscilloscope or Logic Monitors

Thread Starter

Calton57

Joined May 4, 2015
33
How do you set up an oscilloscope to capture a logic glitch?

I have to use single shot on the oscilloscope but what do I connect to the external input on the Oscope to?

I'm using Oscope Ch#1 to probe around the circuit boards on each IC TTL/CMOS logic chips. But I'm not sure what to connect the external input on the oscope to trigger off of. What can I use to trigger off of to use the external input?

Some Logic Monitors have a latch button that can capture logic glitches. Most Logic monitors don't have this latch option. How would I be able to modify a logic monitor to have the latch option?

I read in a 70's electronic book is to use several logic monitors set to latch when you're trying to find a logic glitch in one of the IC chips.

It says to disconnect the crystal or clock circuit and just use a jumper wire and touch the Microcontrollers clock input pin to +5 volts VCC to step through the cycles of the program.
 

dl324

Joined Mar 30, 2015
18,337
Basically, you use the signal that triggers the glitch as an external trigger. Need more information.
 

Thread Starter

Calton57

Joined May 4, 2015
33
Basically, you use the signal that triggers the glitch as an external trigger. Need more information.
But I'm not sure which logic TTL/CMOS chip is causing the glitch. I'm hunting to find the logic glitch

How do you step through the ROM program? do you disconnect the crystal oscillator?
 

dl324

Joined Mar 30, 2015
18,337
But I'm not sure which logic TTL/CMOS chip is causing the glitch. I'm hunting to find the logic glitch

How do you step through the ROM program? do you disconnect the crystal oscillator?
Can't say without more info. Post a schematic and whatever info you have on the glitch.
 

ScottWang

Joined Aug 23, 2012
7,501
Are you driving a small board on the ocean again, how is the view, what kind of the tree to made that board, where is the destination?
 

Thread Starter

Calton57

Joined May 4, 2015
33
If you guys had a TTL/CMOS logic board that has a glitch, how would you set up the oscope to capture the glitch?

Just for a general setup for capturing logic glitches
 
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