hi I'm Melissa and welcome the Scopes University. Today we're going to get
comfortable using the Infiniium S-Series oscilloscopes and learn some basic setup
and triggering tips. Today we're going to learn how to set up the oscilloscope for
basic troubleshooting and then we'll get a little bit more specific by showing
you how you can set different triggers to locate defects in your waveform. Along
the way we'll look at cool capabilities of the infiniium GUI that will help make
your life much easier so let's get started. If you arrive at your test bench
to see that your colleague has left some crazy settings on the oscilloscope a
nice way to start fresh is to press default setup. Also if your workbench is
really crowded and you don't have a mouse we can enable the touch screen by
pressing this button on the front panel here just as Erin showed us in episode
1 we can pinch and zoom to change the scale of the waveform on screen. We can
also move it up and down and we can change our trigger level if we want to
have the scope set it up for us we can either use Auto scale on the front panel
or we can right click. To right click with touch you just hold your finger
down until the circle appears and then we'll choose Auto scale from this menu.
If we have signals on all four channels we can turn on channels 2 through 4 as
well so we'll turn on channels 2, 3 & 4 and we can scale these each separately
with their own designated knobs on the front panel. We can also view these
waveforms separately in their own grids. So we'll right click and then we'll
choose number of grids and we'll select 4 and we can drag-and-drop each of the
waveforms to its own separate grid. Now we're ready for viewing our waveforms and
doing basic troubleshooting. Next I want to connect a DUT that that hasn't been
behaving properly so I can see if I can find out what's going on. So now I have
my faulty DUT connected and we could just hit undo to get rid of this stacked
waveform setup that I have but remember our two handy tricks from earlier we can
hit default setup and auto scale. So we can do that by right-clicking
and selecting default setup. And then we can right click again and hit Auto scale
Or we could have done that from the front panel. Just with these two simple
steps we can already see that there's something wrong with my waveform. You can
see every once in a while here there's a small pulse here that occurs that's
lower than the other pulses. So first I want to make a voltage peak-to-peak
measurement to find out what the voltage is normally on my signal. So we'll come
over here and we'll use the quick drag-and-drop measurement menu. And I
want to make a vertical measurement, and I'll grab this voltage peak to peak and
drop it onto the waveform. That tells me that I'm getting 2.8 volt peak-to-peak
on the signal normally. It looks like these runs are maybe only rising up to
either 1.8 or 2.3 volts but it's hard to tell without being able to see them
consistently. So let's change that. Auto scale uses a basic edge trigger to
stabilize your waveform on screen but we can choose other events to trigger on as
well let's go to the trigger menu and select setup. You can see there are a
bunch of different anomalies that we could choose to trigger on in the
waveform but because we're seeing a pulse that's lower in voltage than the rest
let's choose runt. It looks like a rising edge runs and the source of channel 1
and we want the low threshold to cross the waveform so let's set that between
negative 125 millivolts and 375 millivolts. I'll choose 300 millivolts. We
want the high threshold to be above the runt and we said we thought it looked
like it was between 1.88 volts and 2.38 volts
so let's just set it for 2.5 to be sure we're above the runt.
And it looks like we're capturing those runts. Before I have my trigger set to
runt I couldn't quite tell what the voltage of those runt signals were so
let's go ahead and measure it with markers. We'll turn on markers here. And we
want it set to channel one and now we can drag my markers to the top and the
bottom of my waveform. And now I can see that that runt is about two volts
peak-to-peak. Now that I've captured the defect in my signal I'm probably
ready to get back to my desk look at my code and find out what the root cause is.
But I can also save my waveform data so that I don't have to come back to the
lab in case there's anything else I want to look at in the waveform data. So let's
look how to save it so we can do more analysis offline. I'll go into file save,
choose waveform, and I'll save this as DUT 5 runt. And save it, and now it's saved to
my desktop on my oscilloscope. Here I'm back at my desktop and I've got Infiniium
offline up and running. This gives me the exact same GUI that I had on the
oscilloscope on my desktop computer. I want to look at the waveform that we had
earlier on the oscilloscope so I'll go to file, open, waveform, and I'll choose
"DUT 5 runt" and open it. Now I can do all the things that I was doing on my
oscilloscope. I can make drag-and-drop measurements.
I can turn on markers and I can even change time-base by using the scroll
wheel of my mouse to zoom in and out. I have all the capabilities of the
oscilloscope available on my desktop. So we learned how to set up our
oscilloscope for basic troubleshooting and how we can use triggers to capture
defects and anomalies in our waveform. We can also save that waveform data if we
want to do additional analysis offline later. Thanks for joining me and if you
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