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| True analog scopes |
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| BillyO:
--- Quote from: Mechatrommer on December 15, 2022, 05:22:01 pm --- BNC input .. --- End quote --- BNC input? They don' need no stinkin' BNC input! |
| jonpaul:
Rebonjour, Having used Lecroy, TEK and Yokogawa digitals since 1993, they are great in some uses like transient capture, storage or saving the images. But NONE can do a real X-Y Lissajous well or easily, (used in Audio and time measurements among other applications) Many DSO lack the Analog CH1-CH2 or CH 2 INV function to get a differential view. Finally the lowest sesnitivity is nowhere as good as a fine analog TEK plugin for 7000. Regarding cost of analog scopes, my finds in the last year...Two Hameg German design, made in France,1980s HM103, EU 5 at Paris street sale...works fine 1 ch 10 MHz! HM204 EU 25 another street sale 20 MHz 2 ch Includes a handy Lissajous component curve tester! Perfect for 99% of basic audio and museum troubleshooting and tests, in a small apartment lab. Also TEK 475, fixed up the HV mult, bottom feet are crumbling, still works! VIVE L'ANALOGIQUE! bon soiree! Jon |
| H713:
Yes, in some parts of the world, getting a "working CRT scope" is hard. Has it ever been easy? I don't have an answer for that, but doubtful. In the US (which, incidentally, is a fairly significant number of people!), that is far from the case. Over the past two or three years, I've picked up half a dozen analog scopes, all at least 100 MHz (mostly Tektronix, Kenwood, etc) for about $50 each - and I've passed up a whole lot more that I didn't want to deal with. None were listed as working, but none of them (except the 454A that I way overpaid for) had any significant issues. This stuff still turns up at surplus auctions and hamfests. Most universities still have piles of these things sitting in labs and storage rooms, and they come available every time their is a cleaning operation. There are a lot of Tektronix 2215s and 2235s kicking around - they sold an insane number of these things. Keep in mind, I live in southern Wisconsin, where most storage facilities are filled with rotting taxidermy, dead snowmobiles and 3000-year-old C-scows. In other parts of the country, old test equipment is significantly more prevalent. Again, this stuff was pretty reliable. The reason that there are so many dead ones on eBay is that the same dead scopes keep getting resold. If I could only have one scope? Certainly digital, and unless you're given an analog one for free, your first scope should probably be a digital scope at this point, simply because it can do more. But once you have that, a good analog scope is still rather nice to have around. A last worthwhile point I'll make is this: Fast digital scopes are marvel of signal processing, fast analog scopes are a marvel of physics. |
| tautech:
--- Quote from: jonpaul on December 16, 2022, 02:15:50 am ---Many DSO lack the Analog CH1-CH2 or CH 2 INV function to get a differential view. --- End quote --- Really you have no idea what features are in the modern DSO, none at all ! Minus is a very common Math function and Invert is a channel menu feature both of which are top level menu items in their respective places.........NOT front panel buttons or switches ! Further these 2 functions (Minus Math and Invert) appear in channel tabs plain as day so not to divert the eye away from where the action is really happening......on the display ! Is it because of EASL or are datasheets and manuals difficult for you to understand ? Like I mentioned before you could really benefit from getting a modern DSO to learn what they really can do instead of some decades old blinkered incorrect opinion. |
| Mechatrommer:
--- Quote from: BillyO on December 16, 2022, 01:26:46 am --- --- Quote from: Mechatrommer on December 15, 2022, 05:22:01 pm --- BNC input .. --- End quote --- BNC input? They don' need no stinkin' BNC input! --- End quote --- i meant banana jack. how could i made such mistake? :palm: --- Quote from: tautech on December 16, 2022, 04:55:14 am --- --- Quote from: jonpaul on December 16, 2022, 02:15:50 am ---Many DSO lack the Analog CH1-CH2 or CH 2 INV function to get a differential view. --- End quote --- Really you have no idea what features are in the modern DSO, none at all ! Minus is a very common Math function and Invert is a channel menu feature both of which are top level menu items in their respective places.........NOT front panel buttons or switches ! Further these 2 functions (Minus Math and Invert) appear in channel tabs plain as day so not to divert the eye away from where the action is really happening......on the display ! Is it because of EASL or are datasheets and manuals difficult for you to understand ? Like I mentioned before you could really benefit from getting a modern DSO to learn what they really can do instead of some decades old blinkered incorrect opinion. --- End quote --- (EASL)? what CRO got to do with Liver association or EA basketball league? ;D btw if SW math is not preferable, being slow as its excuse. buy differential probe, or make an inverting opamp (of differential probe input in reverse), they are jellybean cheap today. a very good differential CH2-CH1 (high CMRR @ high BW) is not cheap anyway, today and before. if big names like Tek/Keysight/Lecroy/R&S opted to remove that features from DSO, there must be due to some logical reason. dont be a person who want to buy CRO just because it has CH1-CH2 or CH 2 INV HW function. just as a person who want to buy DSO just because Auto button, they are very minority here though, or beginner who just came here ready to be educated. |
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