Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
duckduck:
--- Quote from: ch_scr on December 10, 2022, 10:04:14 pm ---Seems like the seller knows he's the cheapest option. Not sure if I would swallow the additional 60$ to make it nice and have one, or send it back and pray for a bargain "next year". I sure get the feeling of beeing cheated here, but maybe at least sleep over it before sending it back?
--- End quote ---
Yes, I'm going to wait and see for a bit. Hoping the seller softens meanwhile. It was a really dirty and rough unit. I cleaned it for an hour before turning it on and it is still filthy. It's a good candidate for the old Tektronix washdown. I might just bite the bullet and spend USD500 for a nice HP 8657A. I tend to be a cheapskate, but that's more as a result of my personality than from necessity.
EDIT:
I recently got my "Amateur Extra" ham radio license (the highest ham license in the USA). The tests are pretty easy here, especially if you have some prior electronics/physics knowledge.
I also pulled a "Vince", and diagnosed my neighbor's studio monitor that had low volume. Was hoping for a challenge, but turned out to be a defective volume pot that I troubleshot with a handheld DMM. The manufacturer helpfully emailed me a schematic. It was also helpful to have the second monitor to compare it against. I've got a new pot on the way via ebay, since I couldn't find a replacement at Digikey.
EDIT EDIT:
My AWA Signal Sniffer came in handy troubleshooting the monitor.
https://www.eevblog.com/forum/testgear/antique-wireless-association-signal-sniffer-build/msg3734263/#msg3734263
As well as my Rod Elliott Audio Oscillator:
https://www.eevblog.com/forum/projects/successful-assembly-of-my-first-electronics-project-esp-miniosc/msg3097293/#msg3097293
vze1lryy:
Hah! Just got linked to this. Sorry to revive such an old thread, but can't let this one go. This is some disingenuous garbage. Let's go line by line.
--- Quote from: bd139 on March 24, 2021, 07:17:19 am ---They will laugh all the way to the bank while shouting “it’s out of warranty - here’s the schematics” when you knock that poorly chosen USB-C connector on the motherboard and damage it. Hint: they mostly aren’t replaceable or repairable these days. You’re then at the mercy of a network of idiots and morons to do your repairs.
--- End quote ---
Mercy of a network of idiots and morons to do your repairs - you mean the independent repair community that figured out the design flaws & solutions to these devices before the manufacturer could even release a recall program? For many of the products with design flaws, WE proposed modifications so they can work again before the manufacturer issued a recall program.
Are they giving iPhone 6+ boards with M1 jumpers, or reflowed broadcom chips? Are they giving 820-2850 with modified framebuffer 1.35v buck converter circuits, or with the same inappropriate tantalum capacitor on C9560? Are they replacing iPhone 7 boards with audio IC issues with stock boards or with the requisite jumper so the board WON'T have intermittent audio within a year?
Several of my videos go over fixes Apple themselves weren't using in their own recall programs, instead just replacing a dead device with another board that will fail in the same way. You come here with blanket insults of the entire industry calling us idiots and morons; I can provide at least half a dozen citations to repairs we do that last longer than the manufacturer's, that were available long before the manufacturer ever issued a recall.
You know nothing about our industry and are willing to speak in disparaging absolutes. You have no knowledge base with which to make such statements and just spout your mouth off to sound edgy.
--- Quote from: bd139 on March 24, 2021, 07:17:19 am ---We need better than a right to repair. We need the manufacturers to support the device for the full lifecycle with all costs covered including ones from crappy engineering decisions like mounting wear items like connectors on the motherboard of laptops etc. .... Also Mr Rossman is there selling this ideology because he’s a salesman selling his repair product. He wants you to come to his business and wants the manufacturers to keep on with this crap because it fills his pockets. And some of his repairs are quite frankly shit. I’ve actually had a discussion with him about this on the forum :-DD
--- End quote ---
In terms of manufactures keeping on with not supporting customers, this couldn't be further from the case. In every video where I go over these design flaws, I shame Apple for not providing a proper warranty recall program to the customer. You don't care about that because it cuts against your narrative of me as the happy merchant or some shit.
I agree that manufacturers should take accountability and responsibility for their design flaws - which includes fixing them for free for people who purchased the product. This is why my videos shame the manufacturer for not releasing extended warranty programs for issues, and repeatedly call on them to recall issues - whether it's flexgate warranty applying to a1706 2016 but not a1707 or a1706 2017 models, the 51v to the CPU problem, the 820-2915/820-2914 GPU problem prior to spring 2015, the A1278 2012 hard drive cable problem, the A2141 SSD buck problem, or a number of others on my channel.
I pull no punches in criticizing Apple for not supporting their customers properly when it comes to confirmed design flaws on their products. The argument here is that I am some salesman, as if this is a bad thing. I make money doing what I do, and I am proud of how we make our money. I don't make money off of artificially restricting a marketplace or depriving people the ability to have their items repaired, by a third party or themselves. I spent ten years showing everyone else how to do what I do, publicly, and have a non-profit dedicated to funding educational guides so everyone can do this work, including my competition. My non-profit, which I take $0 in pay from, funds the creation of guides like this so that EVERYONE - end users, or professional technicians who are my competition alike, can be more likely to perform successful, quality repairs.
In terms of my work, I stand by what we do with a longer warranty than the manufacturer provides on their own repairs. We maintain a better rating on google than any apple authorized service provider in a 30 mile radius - and any apple store in a 30 mile radius, and our reputation for the work that we do is second to none.
--- Quote from: bd139 on March 24, 2021, 07:17:19 am ---We need the manufacturers to support the device for the full lifecycle with all costs covered
--- End quote ---
Why should the manufacturer be forced to cover and pay for you spilling something on a device you own, or you dropping it off a table?
Peter_O:
--- Quote from: tautech on December 10, 2022, 08:47:07 pm ---
--- Quote from: ch_scr on December 10, 2022, 08:38:41 pm ---................
@Peter_O: An FFT might give a good indication on where the distortion is lowest. At least a lot better than "staring at the sine". Limited by instrument distortion obviously, an 12bit one would really shine there...
--- End quote ---
10 bit mode is available up to 100 MHz. ;)
--- End quote ---
Thx to all of you for feedback!
So best approach would be to stare at the FFT and try to fiddle with the adjustment to minimize the harmonics by eye.
Thx Ch_src for TEAing a 12bit over my 8/10 bit scope. :-DD
Thx Tautech for fencing TEA in again despite Silent's having a HD to offer now. :)
Peter_O:
Just had a look into competitor's R&S manuals.
The RTM series does know THD, but only via SW access, not on the GUI.
The lower price range RTB manuals show no hits when searching for "THD".
So it seems to be no simple ommission of Siglent, but a challenge for the lower price ranges.
tautech:
This recent Paper may offer some guidance Peter:
https://www.researchgate.net/publication/362542224_Total_Harmonic_Distortion_THD_analysis_utilizing_the_FFT_capabilities_of_modern_digital_storage_oscilloscopes
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version