Author Topic: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.  (Read 4715 times)

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Offline Dr Wobble

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Got an email today saying Dave has just uploaded a video. Clicked link, video unavailable. Could be me doing something daft but don't thinks so. thought I'd let you know Dave.

Secondly, Dave seems a bit all over the shop recently, I was hoping this video would be himself getting back on form.

Best regards, Andy.

PS, Utube said they were sorry. Have they got the knives out for EEVblog
« Last Edit: April 20, 2017, 01:30:55 pm by Dr Wobble »
 

Offline jpc

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Yeah, same here and was about to post when I saw your post.
 

Offline Dr Wobble

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Not just me then. Perhaps he uploaded it and wanted to edit it, so had to delete it.

A.
 

Offline jpc

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Nope, not just you, I even checked all three channels just in case.
 

Offline bktemp

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It was there, but it is gone now.
Maybe Dave found another difference between the old and the new revision he missed in the video? Like JP1 connecting the mainboard to the input terminals.
 
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Offline FOObar

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Raises hand, I have the same problem.

EEVblog #987 - Keysight U1272A Multimeter EMC Followup
3 hours ago.

:\

I hope this hasn't anything to do with YouTubes descision to block his "EEVBlog Discover(y)" channel.
 

Offline jancumps

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Quote
Dave seems a bit all over the shop recently, ...

All over the shop with high quality. 3 excellent videos full of science in a few days...
 

Offline elliottveares

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Same to here in the UK, I just get "This video is unavailable."

Quote
I hope this hasn't anything to do with YouTubes descision to block his "EEVBlog Discover(y)" channel.

Me to!

I have however found a cached copy on yahoo though and since downloaded it to my computer.  ;D Would share a link to my download of it on here, but I think that would activate the ban hammer.
 

Offline FOObar

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DM me the URL, i don't care about the posibility of being banned.
 

Online Bud

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Secondly, Dave seems a bit all over the shop recently

I am of same opinion and honestly it worries me.
Facebook-free life and Rigol-free shack.
 
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Offline FOObar

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #10 on: April 20, 2017, 04:56:50 pm »
For those playing at home, check this link https://we.tl/jOnpZZX9MW  [This link works until 26 April 2017]
« Last Edit: April 20, 2017, 05:33:52 pm by FOObar »
 

Offline lunecat

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #11 on: April 20, 2017, 05:03:50 pm »

I hope this hasn't anything to do with YouTubes descision to block his "EEVBlog Discover(y)" channel.

That crossed my mind too! Especially since the last EEVBlog video 986 was posted before the trouble with the Disco channel.
 

Offline Dr Wobble

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #12 on: April 20, 2017, 05:13:51 pm »
"All over the shop with high quality. 3 excellent videos full of science in a few days..."

The logic video was good, didn't see the Voyager video's.

I wasn't disparaging his work, more commenting on the general vibe. He seems a bit wired. Understandable what with Utube playing silly buggers.

A.
 

Offline timgiles

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #13 on: April 20, 2017, 05:48:34 pm »
Thanks FB - interesting to see the changes made. I wonder if anyone with a more recent one can crack it open to confirm if the Rev 6 (or 5) board is just a natural minor update to the PCB. I also wondered if Dave could try replacing the resistor and testing it (on his older meter) and then change the two Ferrites again to see the impact of the two noticed alterations.
 

Offline TheAmmoniacal

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #14 on: April 20, 2017, 06:23:22 pm »
Just in case you didn't see it, another difference:

Someone should note all changes and the new part values, see if we can fix our existing meters!
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Offline majenko

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #15 on: April 20, 2017, 06:26:19 pm »
I'm guessing Dave is annotating it with corrections and adding an addendum to the end after I and others that came after me pointed out he mistook 0R links for ferrite beads. Where's his head at these days? Maybe a holiday is in order....
 

Offline Monkeh

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #16 on: April 20, 2017, 06:28:56 pm »
Just in case you didn't see it, another difference:

Someone should note all changes and the new part values, see if we can fix our existing meters!

That looks like just a supplier change (some tants are black, some are orange..). E: Oh yeah, they're drawing the eye away.. bodged in a different size resistor there.

It looks to me like the biggest change is the removal of two series ferrites between 'different' grounds in the meter. The 'new ferrites' look to me like 0-ohm jumpers. Split grounds: Usually not as smart as you think!

There's also that resistor value change, and a diode appeared further up the board (existing footprint, unpopulated in the older meter).
 
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Offline majenko

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #17 on: April 20, 2017, 06:35:39 pm »
The change in tants may have been for a different ESR...? Unlikely though.
 

Offline ggchab

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #18 on: April 21, 2017, 08:17:26 am »
Also another visible difference:
 

Offline cengland0

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #19 on: April 21, 2017, 09:30:33 am »
Another minor but visible difference.
 

Offline JoeN

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #20 on: April 22, 2017, 04:53:20 am »
Also another visible difference:

I noticed that too, and wanted to discuss it.  What would be the principle reason for making a track going from a fuse more narrow in a later rev?  I would have thought it would be the exact opposite, unless it is for some sort of emissions reason?  Or maybe this track is what is picking of the RF and resonating?

Have You Been Triggered Today?
 

Offline bktemp

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #21 on: April 22, 2017, 05:12:00 am »
Maybe the reduction of the track width was necessary because of the additional JP4 next to JP1?
It would be interesting to see why they needed two addional pins going to the input terminals.
 

Online wraper

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Re: EEVblog #987 - Keysight U1272A Multimeter EMC Followup - Not available.
« Reply #22 on: April 22, 2017, 07:49:44 am »
Maybe the reduction of the track width was necessary because of the additional JP4 next to JP1?
It would be interesting to see why they needed two addional pins going to the input terminals.
Yes, in some point of time in between revisions on the video, they were shipping multimeters with a bodge wire between PCBs. IIRC that was to pass updated Canadian safety tests which could blow a small track on transient applied.
 


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