Analog Oscilloscope for true waveform reference. - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: March 30, 2022, 03:27:28 am
content: Hi, I have few scopes with DPO or similar emulation of analog scopes, I compared waveforms specifically modulated signals like SPWM, differences in waveform are substantial, MDO3000 with 10 Mpts, is similar to sds1204x-e, if reduce memory to 10 kpts in MDO is similar to TDS3000 series, I concluded to more memory better or more "real" visualization, I have two option of scopesLecroy LA302Tektronix 2225Tektronix 465bSimilar conditions but tek 2225 comes with original probes, same price for LA302 and 2225 around 200 USD, 465b for 320 USD, other suggest model is welcome, I not rush.I want an analog scope trustworthy, (repairable and with parts available) measurements capability I have from MDO3000 and DSOX2012A, are my more complete equipment because are hacked thanks to this forum.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: March 30, 2022, 09:19:14 pm
content: In the US the 465 should be $100 "working" not calibrated. It is getting old and be prepared for repairs.

author: rauldm
author_rank: Regular Contributor
timestamp: March 31, 2022, 12:28:26 am
content: Thanks for your answer, the 465 is noisy? few years ago I working with 2247a, was very noisy scope for fan

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: March 31, 2022, 01:17:30 am
content: I like the 2225, mine failed under warranty (power supply caps) at the time I needed a scope and that was it so I fixed it.20 years later 47uf caps started failing, replaced those a few years ago its still going strong no other problems.Easy access, easy fixes and the 2225 has no fan noise.Jeff

author: tggzzz
author_rank: Super Contributor
timestamp: March 31, 2022, 10:15:44 am
content: The OP should realise that there is no such thing as a "true waveform". All measurements will disturb the source in one way or another.Any of the old analogue scopes (and I have too manyexcellentones) will require maintenance of one kind or another. That can be an enjoyable hobby, but does it have any place in a business?

author: rauldm
author_rank: Regular Contributor
timestamp: April 02, 2022, 03:42:54 am
content: Quote from: tggzzz on March 31, 2022, 10:15:44 amYour point is, analog is only a piece of history, analog scopes it has same size that PC type scope, for example agilent 8000 series, I can optimize my space with true functional equipmentRegards.

author: tggzzz
author_rank: Super Contributor
timestamp: April 02, 2022, 02:32:37 pm
content: Quote from: rauldm on April 02, 2022, 03:42:54 amNo, that is not the case. For evidence you can look at my earlier posts on the subject.

author: cdev
author_rank: Super Contributor
timestamp: April 03, 2022, 04:44:44 pm
content: couple of years ago I bought a cover for my outdoor hose faucets that was exactly the shape of my Tek osciloscope and made a very nifty oscilloscope camera positioner. This was very useful for making it easy to take photos of whatever is on the screen of my old analog scope easily with zero distractions. With this cover which also has some soft foam to shield the front of the scope from any injury the pfocus is perfect every time.The cover/positioner was very cheap, and its added a lot of usefulness to my 2211 Tek scope. Thanks to global warming, perhaps, our winters in New Jersey (the Garden State, is our state motto here) have also been milder here in NJ so I have not needed to cover the faucets to keep the pipes from freezing in that time.(You Aussies are lucky to have such mild climate!)Styrofoam is great stuff for all sorts of uses, IMHO. This is a good example of the many uses of it. It really does fit perfectly over the front of the scope. Its made for it, almost.There even is some soft foram around the edges to keep extraneous light out completely.