Checking out the fix for the Keysight U1272A Multimeter EMC/RFI problem.
What did they change and why?
Bypass Caps in Parallel: http://www.intersil.com/content/dam/Intersil/documents/an13/an1325.pdf
Grounding in mixed signal systems:
http://www.ti.com/lit/an/slyt499/slyt499.pdf
Forum: http://www.eevblog.com/forum/blog/eevblog-933-keysight-u1272a-emc-issue/'>http://www.eevblog.com/forum/blog/eevblog-933-keysight-u1272a-emc-issue/
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What did they change and why?
Bypass Caps in Parallel: http://www.intersil.com/content/dam/Intersil/documents/an13/an1325.pdf
Grounding in mixed signal systems:
http://www.ti.com/lit/an/slyt499/slyt499.pdf
Forum: http://www.eevblog.com/forum/blog/eevblog-933-keysight-u1272a-emc-issue/'>http://www.eevblog.com/forum/blog/eevblog-933-keysight-u1272a-emc-issue/
EEVblog Main Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2
Support the EEVblog through Patreon!
http://www.patreon.com/eevblog
EEVblog Amazon Store (Dave gets a cut):
http://astore.amazon.com/eevblogstore-20
T-Shirts: http://teespring.com/stores/eevblog
💗 Likecoin – Coins for Likes: https://likecoin.pro/ @eevblog/dil9/hcq3
Done.
made in malaysia, hahahaha
Just tried it with a Voltcraft VC271. No issues at all. You can buy 7 of those Voltcrafts for the price of a single U1272.
What the heck does beulah mean? I hear Dave using it from time to time.
Hi I have an ETEK 10709 multimeter that's not working right. I tried to measure ac voltage of a transformer and did something wrong because now the meter shows inaccurate readings. Any guess of what could it be?
What study program did you follow?
Sorry Keysight is a complete shit.
Agilent is a complete shit.
I was in the NAVY for 7 years on submarines and noise is a very bad thing it can get the sub sunk. We used only top end meters like fluke . This was back in the late 80s. Now the weird part back then when we ordered a meter we got a few radio shack meters . For some reason they did not pick up interference like the fluke. So the radio shack meters we dispersing more than the fluke . And yes I have both meters. Hell the NAVY can afford a few thousand meters as the probably get then taken on all the subs.. As long as you take care of the battery the meters still work better than some of the fluke meters today. Oh by the way the fluke cost 15739.00 and the radio shack 14277.00 Why so high they have to be certified to go on a submarine's hell a ball valve cost 10k
Agilent is a much nicer name than Keysight.
A discussion with an engineer is of a lot more value than lone rambling or talking with PR/CEO. That way you can get real insight and talk on the same level
Maybe there is some soft?are change as well? Is it possible to view the software version in a service menu of some kind?
hi
Love your channel man!
So … where do I send mine to get a hand soldered fix?
Holly crap Bat Man Counterfeit Ferrite's!
C126 changed.
I've contacted Keysight about having the same problem last week but they haven't bothered to respond to email.
THey could fix that beeper sound at the same time to be faster as well as fix capacitance mode so that its more accurate for uF.
navodila za dt-830b
And the predictable response. No problem. At this point we know you are a fanboy. No one cares.
Just keep quality content coming and we can understand why you protect your gravy train. Seriously, just keep it coming.
Put the new meter component which is taken off into the old one, this can show out which problem did there fix?
A pad added near L1 on the top left of the board also?
That microscope displays the zoom level in hex. LOL.
Have to be careful with the ferrite bead's intrinsic inductance. Sure, they may act resistive at some frequency, but they behave like inductors at DC, which can add all kinds of surprises if not taken into full consideration at a ground plane connection. Used some on an RF transmitter design once to help isolate induction into the SMPS; ended up causing problems even with careful design. NP0 filtering proved more effective with less surprises. Bottom line is, ferrite beads are on-par with RF design – pure black magic. 🙂
What is the reason for the fertit beads in between the grounds anyway? I See that a lot in datasheets, but from my experience this does more harm than good.
What is your opinion?
What happened to your Orange Pi cluster project?