Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
med6753:
Let me throw something out for discussion....
I have a fixed (5Khz, .5V p-p) Sine wave that I use as a quick check of scope function. It has a very small glitch on it. On the 2465 it shows up clearly, even with the scope set to 20Mhz bandwidth limit. (Pix 1). Now look at the Siglent DSO. (Pix 2) Do you see it? Yes, because you KNOW it's there. If you didn't know it you wouldn't have a clue. Granted, the Siglent is an entry level DSO with a somewhat limited sample rate. So maybe I'm comparing apples to oranges. But to me this gives the advantage to the CRO. Basically infinite sample rate to see glitches.
bd139:
Try single shot it. Also the intensity grading and persistence on a DS1054Z would show that ;)
You have amplifier slew rate limitations instead of sample rate limitations.
Edit: an example - here's a particularly shitty unstable RF amplifier I built. Note the spikes captured. These have a very low cycle count only:
Specmaster:
I know what you mean about watches, personally I would not grace my wrist with an Omega, Rolex or a Breitling for that matter, they would be sold, simple as that. I have had my fill of the el cheapo watches made from base metals that crumble away to nothing while your wearing them due to sweat causing them to corrode, also had my fill of the Casio's of the type you mention.
These days its Citizen or its cousin, Accurist that I wear, Citizen because of the Eco-drive and SS material used for the case, means that I have a watch that will last and last, not need batteries or servicing and will not corrode while I'm wearing it and is super accurate being as they claim, accurate to withing a few seconds per month, or in the case my radio controlled ones which are accurate to 1 second over 20 million years, don't cost the earth so I'm unlikely to be stabbed for them either so they are not really status pieces as the most expensive one I have costs only £700 new and the cheapest one I have cost me £20 so I'm safe. :-DD
Now that thing in your pocket, if it happens to be one of the latest Apple products, on the hand could pose a possible threat to you as they are seen as status symbols , the logic behind it escapes me though, unlike a diamond encrusted solid 18ct gold Rolex which sends out all the wrong kind of messages
bd139:
Citizen / Accurist are a good deal. They're functional over everything.
iPhone stopped being a status symbol years ago. Can get them on Tesco mobile. Mine's on giffnaff :) Literally crawling with them. The only status now is not having one with a broken screen :)
Specmaster:
Quote from: med6753 on Today at 11:56:39 am
Let me throw something out for discussion....
I have a fixed (5Khz, .5V p-p) Sine wave that I use as a quick check of scope function. It has a very small glitch on it. On the 2465 it shows up clearly, even with the scope set to 20Mhz bandwidth limit. (Pix 1). Now look at the Siglent DSO. (Pix 2) Do you see it? Yes, because you KNOW it's there. If you didn't know it you wouldn't have a clue. Granted, the Siglent is an entry level DSO with a somewhat limited sample rate. So maybe I'm comparing apples to oranges. But to me this gives the advantage to the CRO. Basically infinite sample rate to see glitches.
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To be fair to the Siglent, I think it has picked up the glitch but it is lost in the background noise. I believe it can be seen on the 3rd graticle line from the right and because CROs generally have a far lower noise level it is clearly visible.
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