Electronics > Beginners

Analog scope what it's worth?

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GeorgeOfTheJungle:
But the Agilents have a higher $/lb than the others, ISTM.

smile:
Yes it's nice that digital scopes give read out of all parameters like the Hantek DSO5102P can be hacked to 200Mhz wow  :wtf:

But the jaggy looking wave display???

ataradov:

--- Quote from: smile on January 30, 2020, 03:54:09 pm ---But the jaggy looking wave display???

--- End quote ---
"Jaggy" is how waveform actually looks like. Digital scopes give you more information, not less. So whatever misconceptions you have about digital scopes are just that - misconceptions.

Switches, resistors and knobs that were sitting still in an new old stock device would require immediate maintenance before being used.

ejeffrey:

--- Quote from: smile on January 30, 2020, 10:09:12 am ---
--- Quote from: aix on January 30, 2020, 08:10:20 am ---Why the requirement for it to be new old stock (as opposed to used)?

--- End quote ---

I certainly would go old stock because, you never know how it was used and how much hours it has been used.

--- End quote ---

Hours of use for a oscilloscope is almost entirely meaningless.  Hours of use matters for devices that have regular service intervals and known wear processes which do not apply to oscilloscopes.  Outside of electrolytic capacitors used at very close to their rating that doesn't really apply to oscilloscopes and electrolytic capacitors can and will still degrade if not in use.

Switches and potentiometer condition will depend on how and where the scope was stored, but a used scope may well be better than NOS of the same vintage as regular operation keeps the contacts clean.

A NOS device can be DOA just as easily a used scope.  If you want something you know is going to work and don't want to repair it you need to buy from a reputable seller who has actually tested the operation and/or provides an operational guarantee.

And again, like everyone said, digital scopes show more detail than analog scopes.  Analog scopes by their nature hide some types of noise that are actually there. Analog scopes are not bad: they do the basic oscilloscope operations, they have a relatively small and simple set of controls, and they are easy to use and learn.  Analog scopes are fine but digital scopes are just better in almost every way.  Buy an analog scope if that is what is available or cheap, but unless you are looking for nostalgia, paperweights, or space heaters, prefer digital if you can find it.

rstofer:
Unless you want to constrain yourself to audio related projects or very low speed digital, a 40 MHz scope isn't worth much at all.  To get a reasonable display of a square wave, in my opinion, you would want to display the 9th harmonic (at least) and 40/9 is just 4.4 MHz.  So, in effect, the scope won't well represent a 5 MHz square wave.  That's a little slow, I think!

I did see a 100 MHz Philips on eBay for $25 but $68 shipping.  https://www.ebay.com/itm/Philips-PM3070-100MHz-Digital-Oscilloscope/193317159405

I wouldn't expect to get much of a working scope for less than $100 plus shipping and I certainly wouldn't be looking at a scope with less than 100 MHz bandwidth and, if digital, with much less than 1GSps.  Equivalent time sampling is voodoo...

If you're thinking about digital, where signals are not usually repetitive, the one shot trigger of a DSO makes all the difference in the world.  Just imagine the difficulty of visualizing a 1 us pulse that happens 1 time per day (or even per ms) without one shot capture.  This feature alone is worth reconsidering analog scopes.  About the only thing analog scopes are good for is bandwidth.  I have a 350 MHz Tek 485 (about $200 used 15 years ago) but I bought a DS1054Z primarily for decoding but after I discovered the utility of one shot capture, I'm not sure which feature is more important.  I know I use one shot more often.

In the end, it's just a decision, one of many.

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