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EEVblog Specific / Re: EEVblog #933 - Keysight U1272A EMC Issue
« Last post by Barny on Today at 01:05:31 AM »
I think, the first will arrive in one to two weeks.
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i.e. everything except purely dumb devices who operation changes with battery voltage)

So basically, just the monkey. :)

McBryce.
Doesn't it draw more then 500mA?
(At least when the hands get blocked)
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Although the pictured example may not be the best, the technique is almost as good as going from 1oz to 2oz board.  The cost is essentially nil -- the solder is picked up en masse from the wave solder machine.

When you're trying to figure out how in the hell you're going to make a 500W power supply for $40, fractions of a cent matter big time.

Tim
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Give us a review on this thread when you can.  I think it important to buy local so you can return it should you choose, or you need warranty work.  Rigol and Siglent have their share of quality control issues.  Enjoy.

That's pretty much what I wanted to hear, if I'm honest...

Enough brain-cracking is enough. I'll order the Rigol, if I don't like it I'll find something else.

But it'll be hard to not like coming from a 40 year old entry-level scope.


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Test Equipment / Re: Any experiences with Pomona Kelvin probes?
« Last post by PedroDaGr8 on Today at 01:01:26 AM »
Member iloveelectronics (Franky) does these, have a look at this thread:
http://www.eevblog.com/forum/testgear/franky's-kelvin-clip-kit/

Reply #7 is him and at the foot of his post is his eBay store.

Frank's DIY Kelvin probe kit is awesome quality. Best value on the internet from an awesome seller (ships from HK but arrives in 7-10 days).

EDIT: Just saw that Tautech linked to my review, not Franky's store. Removing the redundant link. I will just mention, Franky doesn't advertise these in his store but message him and he will provide them for you. He has a LOT of stuff that isn't in his eBay store because the eBay store isn't his day job. He just does it because he is a hobbyist like us and has access to a lot of great stuff being basically just across the bay from Shenzen.
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Metrology / Re: Metrology grade scanner card?
« Last post by macboy on Today at 01:00:36 AM »
The 2000-SCAN card used in the 2000, 2001, 2002 meters is rated for < 1 uV contact potential per relay contact pair. That's not bad but not great.

I have a ... (ahem) few Keithley 7001 scanners that have model 7011-S scanner cards in them. They are rated for < 500 nV contact potential per relay contact pair, quite good performance for relays. Each card is actually four 1x10 scanners that can be used independently or combined (into 1x40, two 2x20, a 20x20 matrix, etc). If you are looking at switching a 10 V reference voltage to multiple meters, or multiple 10 V references into one meter, then you are only disturbing the voltage by less than 0.05 ppm.

Those relay based cards use latching relays to help avoid effects caused by coil heating.

Keithley also makes a nanovolt scanner card for the 7001/7002 systems that uses FETs instead of relays. It is an order of magnitude better but is very limited in voltage and current switching (10 V, 50 mA - and those are peak ratings, not average). That card will set you back about $3600.

(p.s. if you are interested in acquiring a 7001 scanner as described above let me know by PM)
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Projects, Designs, and Technical Stuff / Re: EMC design rule check
« Last post by pix3l on Today at 12:58:02 AM »
Indeed harmonics, 3rd harmonics.

We can respin the board but of course we want to know fairly certain that this will eliminate our problems. So modifying our current small batch is the approach for now. Not a problem since we use mostly 0402 and TQFP/QFN packages.

And we have a graph of the spectrum and some small probes which we can use (these: http://www.saelig.com/product/M00154003.htm ). We used these with an Aaronia spectrum analyzer but some frequencies we could just not find with this setup
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Do you still have probes Dave? That way we can do some official testing on him?
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Metrology / Re: RANT - Buying a 3458A why is that hard?
« Last post by Messtechniker on Today at 12:56:28 AM »
Anyway I think ROHS directive allow some authorised exceptions and this will probably be the way to shortcut the problem.
Non-ROHS compliant equipment, (i.e. lead in components and lead in solder) is allowed in the EU for military and medicinal applications.

So if you run the right kind of company ....

Yours  Messtechniker
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And this has been said on here since day 1.

This crazy circus seriously seems to be running round in circles.

And how many deadlines have they missed now, 5 or 6? I've lost count.
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