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| My first oscilloscope |
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| Old Printer:
--- Quote from: rstofer on June 08, 2018, 02:55:49 pm --- --- Quote from: Old Printer on June 08, 2018, 12:15:18 pm ---If you are considering the older Analog Discovery, the only functional difference is an added variable supply with a 5 volt max. --- End quote --- Actually, the AD2 power supply can make use of an external wall wart to drive more power output than you can get with the USB connection. The original AD is very limited on current output while the AD2 can go quite a bit higher --- Quote ---Two programmable power supplies (0…+5V , 0…-5V). The maximum available output current and power depend on the Analog Discovery 2 powering choice: 250mW max for each supply or 500mW total when powered through USB 2.1W max for each supply when powered by an auxiliary supply 700mA maximum current for each supply --- End quote --- The original Analog Discovery was limited to 50 mA from each supply. This USB limit is where the 250 mW number comes from above. Being able to get to 2.1W is pretty nice! --- End quote --- rstofer, quite true on both accounts, but the price range in the used market for the original AD can vary quite a bit, while even used AD2's generally run $250 & above. Digilent sold a ton of the AD1's to students at the $99 price and they are much more likely to show up at a good price. Particularly if the owner has graduated and not kept up with current pricing. |
| mtdoc:
--- Quote from: Old Printer on June 08, 2018, 05:01:13 pm ---rstofer, quite true on both accounts, but the price range in the used market for the original AD can vary quite a bit, while even used AD2's generally run $250 & above. Digilent sold a ton of the AD1's to students at the $99 price and they are much more likely to show up at a good price. Particularly if the owner has graduated and not kept up with current pricing. --- End quote --- Good point. IMO the AD2 which came out after NI acquired Digilent - is simply a repackaged AD1 with a next to worthless "improved" power supply sold at a much higher price. I would not pay anything extra to get an AD2 versus an AD1 (which is a wonderful tool. I love mine!). As I mentioned above, if you add a cheap linear supply (for example one of these for $5.50 0r build one for $2 in parts) to the wall wart you'd have to add to the AD2 anyways, you'll have a much more powerful, small, regulated linear supply to accompany your AD1. |
| rstofer:
I'm not debating the utility of the original AD, I have one. I was a pretty early adopter. I do think the enhanced power supply of the AD2 is a useful upgrade but if the discussion is about USED ADs then, sure, the original will do the job. Frankly, I always get nervous connecting USB things to my PC. I do have a couple of junk PCs for this kind of thing but, more likely than not, I first get started on one of my more important machines. Similarly, I would get a little nervous about powering a project from the AD whether it was a version 2 with wall wart attached or not. The absolute last thing I want to see is magic smoke coming out of my high dollar AD2! I use wall warts to provide things like 5V to a board. I have a bunch of 5V 2A warts that came with various FPGA boards so I don't have any problem finding one. A brief check on eBay shows NO used version 1's and just a few version 2's and some of those are selling for more than factory. Of course, some are marked as 'or best offer' but I don't know what that means in terms of a reserve price. My searching 'foo' doesn't work in eBay. I get a few ADs and then pages and pages of watches and everything else under the sun including such helpful items as iPhone power cables. If somebody has a better search string than 'analog discovery', I'm happy to learn! I would think that if someone were hanging around a college, these things would be a lot easier to find. I wonder if they would wind up in the book store as 'used'. Used textbooks wind up there... |
| osteichthyes:
We have a place used stuff ends up. In my years here, I've occasionally done searches in that store. Once, years ago, an ancient looking scope popped up, but I wasn't looking then. After all of the advice, I'm leaning towards either going for a used analog scope for the time being, or saving my pennies for the Siglent. I did notice that the Siglent doesn't support Linux. But, given that it has a screen, it seems less likely that I'd need/want to use a computer with it anyway. The 4 channel Siglent scopes have a web interface, but I'm really not sure that I'd use it. |
| tautech:
--- Quote from: osteichthyes on June 08, 2018, 09:19:31 pm ---We have a place used stuff ends up. In my years here, I've occasionally done searches in that store. Once, years ago, an ancient looking scope popped up, but I wasn't looking then. After all of the advice, I'm leaning towards either going for a used analog scope for the time being, or saving my pennies for the Siglent. I did notice that the Siglent doesn't support Linux. But, given that it has a screen, it seems less likely that I'd need/want to use a computer with it anyway. The 4 channel Siglent scopes have a web interface, but I'm really not sure that I'd use it. --- End quote --- Some further study for you: https://www.siglentamerica.com/video/x-e-4-channel-web-browser-update-this-thing-is-fast/ The webserver has been enhanced form the earlier factory version resulting from the work done by lundmar here: https://www.eevblog.com/forum/testgear/open-source-lxi-tools-and-liblxi-v1-0-released-for-gnulinux/ If you want to ever get info from it, regardless of the PC OS you can use the websever and the SCPI commands in the webserver interface. |
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