Author Topic: EEVblog #933 - Keysight U1272A EMC Issue  (Read 151893 times)

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Offline Muttley Snickers

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #425 on: January 23, 2017, 12:13:34 pm »
Nice, I do have the cable and didn't even think of that, a brilliant suggestion.   :-+

Many Thanks.   :) :-DMM :-DMM
 

Online wraper

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #426 on: January 23, 2017, 12:13:57 pm »
It should be on factory cal certificate as well.
 

Offline Zbig

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #427 on: January 23, 2017, 12:28:11 pm »
Just a heads up for U1272A owners, I was out in the workshop earlier sorting out some tools and gadgets which I would generally take out to various larger sites and inside one of the large wheeled tool boxes was my other U1272A, anyhow I got it out and noticed that the serial number label is missing and I remembered quite a while back whilst working on a job finding a label at my feet but at the time didn't know what it had come off so it went in the bin.

Anyway, if people are going to discard the original box then they probably should record the serial number or take a photograph with the label intact either of the meter or the box which also displays the serial number.  It looks like I'm buggered on this one unless it's also labelled on the meters PCB which I haven't checked yet and I have no idea where the box for that one went, I spent most of the afternoon looking and found everything else I forgot I had except for the box  :( :'(     
If you have IR data cable, then you can check the serial number with FW update utility.

I have U1273A (the OLED version) and the serial number is displayed nicely on one of the setup pages. Perhaps it's hidden somewhere, under some obscure, broken English abbreviation on the LCD models as well?
 

Offline Berni

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #428 on: January 23, 2017, 03:49:31 pm »
I have U1273A (the OLED version) and the serial number is displayed nicely on one of the setup pages. Perhaps it's hidden somewhere, under some obscure, broken English abbreviation on the LCD models as well?

On the OLED U1273A you can hold the [Null/Scale] button while turning it on to display the firmware version and serial number.
 

Online TheSteve

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #429 on: January 25, 2017, 06:31:30 am »

@Keysight: What has been changed in 1.05 compared to 1.04?
Please update the download page and the Changelog at http://www.keysight.com/upload/cmc_upload/All/U1281_82_firmware_release_note.txt

Keysight has now updated the website to indicate 1.05 is the current version however you get a permission denied error if you try to download the update.
VE7FM
 

Offline Muttley Snickers

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #430 on: January 25, 2017, 08:52:47 am »
I have found that some of the Keysight support and manuals pages are a bit strange, for instance the other day I was looking to see if there were any new updates on both the U1272A and the U1282A meters and noticed that the full manual for the U1272A requires signing in but the U1282A doesn't and can be directly downloaded.

Also I've also been keeping an eye out for the U1282A 1.05 change log to see what they modified and couldn't find or remember what dodgy alias I used at the time to access their site so I was about to register again when I found the version 1.05 change log, even though I bagged them above they are still probably the best around for keeping the manuals and firmware updates readily available so a big thumbs up to Keysight for their great support and efforts.

 :-+

Keysight U1280 Series Firmware Page.
http://www.keysight.com/main/software.jspx?cc=US&lc=eng&nid=-33167.1144466&id=1765967&pageMode=CV


Firmware Revision Updates:- Keysight U1280 Series

Version 1.02
-   Initial release

Version 1.03 fixes several issues present in the previous release.
-   Change microcontroller sampling period from 25ms to 12.5ms.
-   Bug fix for CAP+NULL+AUTO wrong range.
-   Faster LED response for continuity.

Version 1.04 fixes several issues present in the previous release.
-   Change Ampere calibration limits from 70% to 80% to solve       
    production calibration fallout.
-   Improve Autozero limitation by recalculating Autozero and
    not loading Autozero default value when inputs are OL.
-   Reset OP1 & AD1 before reading Autozero.
-   Zero Timer change from 4.2 seconds to 6.2 seconds.

Version 1.05 includes the following fix.
-   Disables DC Filter during measurement at ACmV mode.
 

Offline Sbampato12

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #431 on: January 26, 2017, 10:51:49 am »
Nice, I do have the cable and didn't even think of that, a brilliant suggestion.   :-+

Many Thanks.   :) :-DMM :-DMM

One thing I always do is to put every new gear (from agilent or keysight) in their website. If you login on Keysight website, there is a 'my Keysight' page, where you could insert the model and serial number, and it help keep track of cal, warranty etc...
 

Offline Muttley Snickers

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #432 on: January 27, 2017, 01:52:48 am »
One thing I always do is to put every new gear (from agilent or keysight) in their website. If you login on Keysight website, there is a 'my Keysight' page, where you could insert the model and serial number, and it help keep track of cal, warranty etc...

Yes it sounds like a good plan but as I mentioned above where I couldn't remember what logon or email was used for the Keysight page so in  that regard I probably would have been buggered anyway. We do keep a running and updated list on a printed page for all our login and password details for a variety of sites including banking and other stuff but for some reason the Keysight logon details were not recorded in the last edit, everything else is there on the list such a Tektronix, Thurlby Thander and a host of others.

I wouldn't like the idea of having all my eggs in the one pot anyway and who would have thought that two years after the warranty had expired I would be searching for the serial number on a multimeter that had already paid for itself many times over. Funny thing is I have a Fluke 289 with a problem and have both the original documentation and serial number but because I bought it locally online and cannot verify or prove which distributor it was originally purchased through under Flukes terms and conditions no warranty applies, from my experience it really is chalk and cheese when it comes to comparing warranties and customer support, no doubt about it Keysight wins hands down.
 

Offline WVL_KsZeN

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #433 on: January 27, 2017, 02:28:09 pm »
No luck here.. I don't know what's up with the replacement.

According to Keysight DHL cannot find my address (which is correct) and also is not able to call me (on the phone number which is correct). This has been the case for 1.5 months now. I can't trust this 1272 anymore and just ordered a Fluke. I'm fed up with all of it.

Should have done so from the start. Am really annoyed and ready to throw the old 1272 in the bin..
 

Offline voltsandjolts

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #434 on: January 27, 2017, 03:48:37 pm »
Quote
ready to throw the old 1272 in the bin..

I'll have it if you don't want it  ;D
 

Offline bitseeker

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #435 on: January 27, 2017, 07:33:26 pm »
Quote
ready to throw the old 1272 in the bin..

I'll have it if you don't want it  ;D

In other words, you have the perfect bin to throw it into.  ;D
I TEA.
 

Offline Faith

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #436 on: January 28, 2017, 01:55:21 am »
No luck here.. I don't know what's up with the replacement.

According to Keysight DHL cannot find my address (which is correct) and also is not able to call me (on the phone number which is correct). This has been the case for 1.5 months now. I can't trust this 1272 anymore and just ordered a Fluke. I'm fed up with all of it.

Should have done so from the start. Am really annoyed and ready to throw the old 1272 in the bin..

This sounds more like a DHL issue than a Keysight issue. Have Keysight given you a tracking number of sorts?

If not you should be demanding them for one so that you can ask DHL what's going on.

Also; are they sending it via DHL Express or regular DHL mail? Because the later is hopelessly unreliable.

<3 ~Faith~
 

Offline WVL_KsZeN

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #437 on: January 28, 2017, 09:47:33 pm »
I have a tracking number. But it's not to my address..

Asked keysight, but no reply..
 

Offline Faith

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #438 on: January 29, 2017, 02:00:55 am »
Usually a tracking number is good enough to sort things out with DHL. Give them a call and ask what they can do for you.

Is your name and telephone number correct? Because either one is usually sufficient to convince them to reroute the package to an alternate location.

It's very rare that DHL will not allow you to do that. DHL actually has a lists of online merchants where they prohibit this so that it's harder for someone to make a fraudulent order and then change the delivery address. But this is really limited to big and popular merchants.

Alternatively if there's a DHL office nearby you can also offer to collect the parcel on your own.

Give that a try if Keysight is unresponsive.

Please also note that it's currently Chinese New Year. And while Keysight is based in Malaysia the state that they are located in (Penang) has a very heavy Chinese population. I've been there many times, love that place. It's to be expected that replies will be a little bit on the slow end for now.

So see what you can do on your own with DHL for the time being.

I'm sure it'll be worth it!~
<3 ~Faith~
 

Offline trevwhite

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #439 on: January 30, 2017, 11:19:50 am »
Anyone had chance to compare the redesigned U1272A with the original? Very interested to know what they changed.
 

Offline 2nOrderEDO

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #440 on: January 31, 2017, 11:20:47 pm »
¿Is Keysight replacing out-of-warranty U127x multimeters then?

I have two of them and I am planing on exchange one for the revised version and the other one for the U1282A.
 

Offline Tom45

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #441 on: February 01, 2017, 01:44:13 am »
¿Is Keysight replacing out-of-warranty U127x multimeters then?

I have two of them and I am planing on exchange one for the revised version and the other one for the U1282A.

Yes, out of warranty is not a problem. My U1272a was an Agilent, not a Keysight. As posted recently, I got a replacement with the EMC fixes.
 
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Offline hayatepilot

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #442 on: February 01, 2017, 06:43:06 am »
Could someone post a high resolution picture of the pcb of the revised U1272A?
I'm really curious what they changed.  8)

Greetings
 

Offline bitseeker

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #443 on: February 01, 2017, 08:29:35 pm »
It looks like the U1252B may also have an issue. Just got an email from Keysight with a link to the following service note:

http://literature.cdn.keysight.com/litweb/pdf/U1252B-08.pdf
I TEA.
 
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Offline richnormand

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #444 on: February 01, 2017, 10:29:16 pm »
Just checked the Keysight website in Montreal and they do have a service note about the U1252B....
Contacted them by email. Let's see what the response is.

Thanks for the heads-up bitseeker.

Wonder if it is related to the U1272A or a completely different issue.

Edit: Feb 06.
Just got a RMA from Keysight today to send the unit.
No fuss, no issues.
« Last Edit: February 07, 2017, 02:41:53 am by richnormand »
 

Offline bitseeker

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #445 on: February 01, 2017, 11:44:17 pm »
From the service note, it sounds similar, but at a much higher frequency (80-120 MHz) than what affected the U1270 series and potentially triggering an error message. When Dave's video, episode 933, came out, I only tested my U1252B at 10 MHz and there was no issue. I never tried it at 10x that frequency.

I talked with an engineer at Keysight, but the service note is so new, he didn't have specifics on the issue nor the fix. He said I just have to send my meter in and they'll take care of it.
« Last Edit: February 01, 2017, 11:47:31 pm by bitseeker »
I TEA.
 

Offline 2nOrderEDO

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #446 on: February 02, 2017, 08:19:59 pm »
¿Is Keysight replacing out-of-warranty U127x multimeters then?

I have two of them and I am planing on exchange one for the revised version and the other one for the U1282A.

Yes, out of warranty is not a problem. My U1272a was an Agilent, not a Keysight. As posted recently, I got a replacement with the EMC fixes.

Just for the record:

Hi
 
Thank you for your response and for choosing the option to receive a higher performance U1280 handheld digital multi-meter and redesigned U1270 series handheld digital multimeter. We will process your request base on the information you provided as listed below.
 
Your Name:                XXXXXX
Your mailing address: XXXXXXX
Your phone number:   +XXXXXXXXX
Product Model:           U1272A x 2
Serial Number:            MYXXXXXX & MYXXXXXX
 
A Keysight representative will contact you for the delivery arrangement in two weeks. The delivery time may vary depending on the destination country. Please contact hh_promo@keysight.com if you have any questions.
 
 
Thanks and regards,
 
XXXXXXXXXX
Business Process Coordinator
Keysight Technologies

I was thinking on buying the Rohde & Schwarz HMO12xx oscilloscope, but after this excellent service from Keysight I am starting to reconsider my brand choice. Such customer care is top notch.
 

Offline Tom45

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #447 on: February 03, 2017, 05:10:00 am »
Could someone post a high resolution picture of the pcb of the revised U1272A?
I'm really curious what they changed.  8)

Greetings

Here you go:

Rev 6: https://s15.postimg.cc/kp16tfnkb/220_A1205_stitch.jpg

Rev 5: https://s15.postimg.cc/6vcu4dfjf/220_A1197_stitch.jpg

Due to the size, I'm just posting links.

Note that both boards say Agilent. But the Rev 5 vs. 6 gives it away. I have higher res. versions but even PostImage wasn't happy about  the size.

Happy sleuthing!

« Last Edit: September 03, 2018, 09:02:55 pm by Tom45 »
 
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Offline bernroth

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #448 on: February 03, 2017, 06:12:23 am »
BD4 and BD5 are 0 Ohm resistors on Rev 6 whereas on Rev 5 thes look like caps or inductors - interesting.
Looks like a hand solder job.

These are located right of the 11A fuse.
 

Offline bernroth

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Re: EEVblog #933 - Keysight U1272A EMC Issue
« Reply #449 on: February 03, 2017, 06:25:25 am »
And yes, two 0 Ohm resistors seem to fix the issue  :)

BD4 and BD5 are each 1.5µH (measured @ 100kHz) 0805 inductors.
I took one of the broken units, replaced these inductors by a wire and tested them with the signal-generator.

Side-by-side comparison: the one with the wire shows no problems, the other original U1272A (rev 5) the strange values.

@Tom45: Thank you very much for your hi-res pictures!
« Last Edit: February 03, 2017, 08:18:56 am by bernroth »
 
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