Introduction to the Oscilloscope

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Introduction to the Oscilloscope

• Agilent Technologies 54622D 100MHz Scope

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Sometimes you want to see how signals change with
time
Electrical signals are invisible, unless you know
how to look at them.
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The Oscilloscope provides us glasses
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2 Analog Channels Displayed
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Horizontal Sweep (Time Base)
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Soft keys
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Vertical Amplitude
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Trigger Controls
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Run Control
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16 Input Channels of Digital Signals
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Operation Controls
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Floppy Disk
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How do I turn it on?
Wait for a while as it goes through a self test.
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Analog vs. Digital
Sometimes you want to know the analog details,
other times you just want to know the logical
interpretation. 2 analog channels 16 digital
channels
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We'll Start with the Analog Section
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See something quick and simple

• Reset all settings to default. Hit Save/Recall,
  then Default Setup.
• 2) Connect probe(s) to Probe Comp, then hit
  Autoscale

Do this whenever settings get messed up
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Push down on the top part to expose the little
hook.
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Experiment with Vertical and Horizontal controls.
Adjust slowly to observe effect.
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2 Analog Channels Displayed
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What's this triggering stuff?
You want a repetitive signal to appear to stand
still.

• Normal Triggering
• Runs only if it sees a signal that can
  trigger it.
• If trigger level isn't set rightyou see
  nothing!
• Auto Triggering
• Free runs. Good for seeing if something is
  happening.
• Auto Level Triggering
• Runs so long as there is a signal.
• If trigger level isn't set rightthe scope
  adjusts it for you!
• (may not be such a good thing there is no free
  lunch)

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Start with Auto (free running) triggering, then
go to Normal
Press Mode/Coupling key Cycle through modes with
first Softkey
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Auto triggering
Normal triggering
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Notes on Autoscale
Autoscale works good on signals like this Not
so good on signals like this
If you hit autoscale on a signal like the latter,
you might get something like this
The signal you're looking for is actually here,
but it's way off scale
This is noise
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Recovering from Autoscale
Either Hit Autoscale, then undo
Autoscale or Set gain to reasonable value (say
10 V per division) Keep line visible Move
trigger level to reasonable value
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Fiddle knobs till you see what you want.
200 microseconds per division
1 volt per division
trigger voltage
0 volts (ground) becsuae of the little symbol in
the margin, NOT because it's the bottom of the
trace.
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Saving Display to Disk
Insert floppy disk Press Utility key Set up
Print Configuration with Softkeys Format ? tiff
(bmp can be used also) Print to ? disk Press
Quick Print (Saved on disk with file name QFILE
nn )
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Remember when things get all messed up!
Start over by resetting all settings to
default. Hit Save/Recall, then Default Setup.
If things still aren't working POWER DOWN and
restart the COMPUTER.
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You've got the basics
For additional details and capabilities, go to
the manual. There should be some lying around,
if not ask your instructor.
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• Digital Addendum

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Digital Section
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Enable one or both digital inputs
Disable analog display by double clicking buttons
1, 2.
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After you're sure that you seeing something Set
trigger to a digital channel (probably).
What you trigger on depends on what you're
looking for. If you're counting, trigger on D7.