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Old 26th September 2005, 11:35 AM   #1
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Default Scope sweep speed question

Hello all!

Just a quick question:
Can i use a single sweep frequency (say, 1MHz) for all frequencies from 0 to (in this example) 1Mhz?

Thank you
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Old 27th September 2005, 03:04 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
your scope horizontal (sweep) axis is in mS or uS/div.
You usually adjust the sweep speed to display the portion of signal you want to examine. 50Hz needs an opposite end of sweep scale from 200kHz.

Q1. Is there a way to display signals below 10Hz so that they can be read?
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Old 27th September 2005, 05:28 PM   #3
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I cant tell the time division :P
It's that i'm planning to make a simple scope based on vintage tubes ans schematics, and to simplify the sawtooth sweep generator, i would make it a single frequency unit.
I know that for €150 i could buy a brand new scope, but it's taht thign that pushes us forward in DIY
So, for instance, if i used a large frequency in relation to a smaller frequency, it would be displayed more times?

Quote:
You usually adjust the sweep speed to display the portion of signal you want to examine. 50Hz needs an opposite end of sweep scale from 200kHz.
Excuse me Andrew, but could you explain this a bit more? I realize i may seem dumb, but i'm very very tired and sometimes can't make sense out of things

Thank you
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Old 27th September 2005, 06:13 PM   #4
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It does need to be sweepable.

You might want to read this for more background.
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Old 27th September 2005, 06:42 PM   #5
anatech is offline anatech  Canada
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Hi pinkmouse,
Broken link. For me anyway.

-Chris
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Old 27th September 2005, 06:47 PM   #6
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Hmm, worked last week, I'll see if I can find it again. It's the XYZ of scopes on the Tektronics site...

edit: Try this.
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Old 27th September 2005, 07:45 PM   #7
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Quote:
Originally posted by AndrewT
Q1. Is there a way to display signals below 10Hz so that they can be read?
Yes with a digital or a storage (big, expensive and old) oscilloscope.
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Old 27th September 2005, 07:50 PM   #8
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IIRC-- you could amplify/divide a sweep signal to achieve the desired
voltage-rise-per-unit-time between the deflection plates.
I would think there would be limits to this approach and at some point different sweep frequencies would be needed.

It has been a long time since I thought about building a scope so
this opinion may need a sanity/senility check
D
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Old 27th September 2005, 09:48 PM   #9
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Thanks for the link pinkmouse, i'll read it

BTW, here's the project i'm following (the chassis is almost finished using an old mini-tower PC case as a basis - grind, weld, blá-blá).
Having it (cross fingers) working would be great as i iwould then have a base for experimenting what i've learned and evolve as a bit of my own design.
Hey, i even thought of a low slew rate opamp fed with a square-wave to make the sawtooth signal to feed the horizontal sweep plates

Thank you all, good night

http://www.electronixandmore.com/project/7.html
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