introduction to the oscilloscope agilent technologies 54622d 100mhz scope
Post on 19-Dec-2015
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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
1) 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 right—you see nothing!
• Auto TriggeringFree runs. Good for seeing if something is happening.
• Auto Level TriggeringRuns so long as there is a signal.If trigger level isn't set right—the 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 keyCycle 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:
This is noise
The signal you're looking for is
actually here, but it's way off scale
If you hit autoscale on a signal like the latter, you might get something like this:
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Recovering from AutoscaleEither:Hit Autoscale, then undo Autoscale
or
Set gain to reasonable value (say 10 V per division)
Keep line visible
Move trigger levelto reasonable value
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1 volt per division
Fiddle knobs till you see what you want.
200 microseconds 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 SoftkeysFormat 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.