Author Topic: Keysight 3000T scope 1 GHz(or more) hardware upgrade mod (Read 35088 times)

adranp · « **Reply #50 on:** July 02, 2017, 08:53:35 am »

:mrpackethead

K1 is unpopulated in models lower than 1Ghz.

Look carefully in the picture for K2 and K3 designators. K3 is unpopulated in lower than 1Ghz models and K2 is populated. There's the same relay at K502 position which is going to stay there (in all models).

Also wanted to add that probably I'll be the next person doing this mod (some of my parts are here already and some will arrive next week)..

Steve did a wonderful job putting this mod in a form that's quite easy to understand.. He explained a lot of things he encountered..

As he said already, please be advised this mod is not very simple. The number of parts to be added/swapped/removed is quite a task. Without proper soldering skills and tools this is going to be a nightmare.
Before doing this mod I highly advise any of you to look at the other forum thread and understand the mod for 350/500Mhz and then come here and look at what should be done for 1Ghz.
There are a lot of steps which could damage the PCB, so be advised on that.

mrpackethead · « **Reply #51 on:** July 02, 2017, 08:57:48 am »

Got it! there are still 2 of the Relays on the board. K2 is removed and K3 installed. theres a relay that doesnt get moved at all.. I did'nt see K2 is in the text on the unpopulated pads.

I suspect that some preheating will make it easier to get the thing off.. ALso reduces the risk of damaging the board. Hate to lift a track.. You might also be able to use some low melt solder in there...

mrpackethead · « **Reply #52 on:** July 02, 2017, 09:04:17 am »

Quote from: adranp on July 02, 2017, 08:53:35 am

Steve did a wonderful job putting this mod in a form that's quite easy to understand.. He explained a lot of things he encountered..
Quote

In deed he has. I'd just failed to read the pictures properly.

Quote
As he said already, please be advised this mod is not very simple. The number of parts to be added/swapped/removed is quite a task. Without proper soldering skills and tools this is going to be a nightmare.
I'm pretty confident that i can do this, and i have a well equipped lab with good rework tools and inspection. Its a case of being careful and through, and making sure that you can absolutely understand all teh steps *BEFORE* you start. I'm away for another week, but i'm going to start ordering the parts, so i can get onto doing mine when i get back.

Quote
There are a lot of steps which could damage the PCB, so be advised on that.

Yes.. I need to have a look at the PCB and see if i can get it in the big preheater. Its just so much safter to get the pcb up to about 150C, and then start with the hot-air..

adranp · « **Reply #53 on:** July 02, 2017, 09:13:16 am »

Hotair is required just for the relay removal at K2.
On the back of the board you have the BNC connectors which might give you some trouble putting the board on preheater.

A tool which would make your life much easier would be a soldering tweezer.

TheSteve · « **Reply #54 on:** July 02, 2017, 04:30:15 pm »

Quote from: mrpackethead on July 02, 2017, 08:29:37 am

Did you preheat the board?

As adranp mentioned I did not preheat the board at all. If I was doing it again I might gently warm the entire board with a heatgun. I had planned to sacrifice the relays all along though. The space is very tight so you can't direct the hotair right at the legs of the relays, it basically gets directed right on the top of them. The relay you need to keep and not damage is only a few millimeters away(less then a quarter inch).
Lifting traces shouldn't be an issue unless you're way to aggressive trying to remove the relays. The PCB is of high quality and you should be very gentle when removing the relays.

nctnico · « **Reply #55 on:** July 02, 2017, 04:32:33 pm »

You could use polyimide tape to shield parts of the board from the heatgun. Recently I did rework on a delicate board as well and the polyimid tape worked like a charm.

TheSteve · « **Reply #56 on:** July 02, 2017, 04:51:58 pm »

Quote from: nctnico on July 02, 2017, 04:32:33 pm

You could use polyimide tape to shield parts of the board from the heatgun. Recently I did rework on a delicate board as well and the polyimid tape worked like a charm.

This was absolutely done - and metal shields too. Without it the other relays would be cooked too.

mrpackethead · « **Reply #57 on:** July 02, 2017, 07:52:54 pm »

Makes me think that i should buy some extra relays, just in case.

Gandalf_Sr · « **Reply #58 on:** July 03, 2017, 02:14:04 am »

Damn Steve - DAMN!

TheSteve · « **Reply #59 on:** July 05, 2017, 04:04:19 am »

Hmm, anyone have a DSOX4154 and want to take some pictures?

mrpackethead · « **Reply #60 on:** July 05, 2017, 05:49:23 am »

1Ghz is plenty for me. but i can see the challenge. how much attenutation are you seeing there.. i saw 120mV PP, but not sure how what you were inputing.

TheSteve · « **Reply #61 on:** July 05, 2017, 05:58:30 am »

I was inputting 1 Vpp at 1.5 and 2 GHz. The attenuation is completely expected of course as the input filter maxes out at 1 GHz and the antialias/low pass filter is also tuned to 1 GHz. Both would need to be altered to have a true 1.5 GHz of bandwidth. I was impressed with the triggering though, even at 2 GHz it was solid.

mrpackethead · « **Reply #62 on:** July 08, 2017, 12:48:44 pm »

Im having trouble getting the atenuators.. ANy suggestions of where to get them.

mrpackethead · « **Reply #63 on:** July 13, 2017, 02:33:55 am »

Sorry for the bump, but i'm really struggling to be able to locate those attentuators? Any one can you make a suggestion.. Maybe i'm looking in the wrong place.

TheSteve · « **Reply #64 on:** July 13, 2017, 02:42:06 am »

A few weeks back avnet had stock and you could buy them in single quantities, now it appears they have none and you need to buy 25 of them. I haven't looked at official distributors outside of US/Canada myself. You can also get quotes via seekic. I got mine from here: xingsheng.member.seekic.com

KE5FX · « **Reply #65 on:** July 13, 2017, 04:05:54 am »

Sounds like Keysight has been buying up all the attenuators.

Jwalling · « **Reply #66 on:** July 13, 2017, 09:25:52 am »

Quote from: mrpackethead on July 13, 2017, 02:33:55 am

Sorry for the bump, but i'm really struggling to be able to locate those attentuators? Any one can you make a suggestion.. Maybe i'm looking in the wrong place.

http://www.oemstrade.com/search/A150-20-12

Online components (if these are legit...)

adranp · « **Reply #67 on:** July 13, 2017, 10:17:24 am »

I can confirm my relays are also from xingsheng.. They just arrived 2 days ago.. Seem legit and also new.. Take great care on seekic as there are a lot of sellers who sell used parts..

adranp · « **Reply #68 on:** July 16, 2017, 04:17:22 pm »

Just a quick update. I have successfully upgraded my scope to 1GHz.

One important thing to add is that there is 100% chance to remove safely and reuse the K2 relays using preheating plate and hot air + kapton tape and metal shields. I've preheated the pcb at around 90 degrees Celsius (measured near the relay) and then removal was without any issues.
No discolouration or melting on the removed relays.

I'll post detailed info in a few days.

Zucca · « **Reply #69 on:** July 20, 2017, 08:39:34 am »

Quote from: adranp on July 16, 2017, 04:17:22 pm

I'll post detailed info in a few days.

Please!!!!!

adranp · « **Reply #70 on:** July 20, 2017, 08:41:07 am »

Please bear with me a little more.. The mod is working perfectly but we're trying to give you a nice bonus raising the bar to 1.5 Ghz

Zucca · « **Reply #71 on:** July 20, 2017, 08:58:52 am »

ok, now I can't sleep anymore. Thank you.

TheSteve · « **Reply #72 on:** July 20, 2017, 04:10:50 pm »

Hah - I dream of more bandwidth every night! Anyway, we're working on it and the dream is 1.5 GHz.

Netroman · « **Reply #73 on:** May 19, 2018, 05:07:11 am »

@TheSteve: Thanks 1000 times for the superiour description and hard work to make this mod possible - also thanks to all the supporters of Steve.

I have completed the mod on my MSOX3024T - now with 1 GHz. I used a special rework station to be able to solder the 0603 and 0402 parts (JBC Nase) - no chance with my old Ersa, even with the smallest tips.
There was a lot of soldering, but at the end successfull

The only problem I have now, is, that the user calibration (I use 4 equal length cables from Telegärtner) fails after about 1/2 min.
Though measured Signals look equal on all 4 channels - just slightly difference in measured voltages, which does not matter much for me (but maybe for cal?).
Maybe it's possible to figure out, which channel causes the problem - for now, I have no clue. I wonder, if the Serialport gives some hints, where the calibration fails.

Nevertheless I'm very happy with my 'brandnew' 1 GHz scope

TheSteve · « **Reply #74 on:** May 20, 2018, 12:14:05 am »

Netroman - I'd say there is an issue with an attenuator stage or the drive signals for an attenuator stage based the PM's you've sent and the data you provided.


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Author Topic: Keysight 3000T scope 1 GHz(or more) hardware upgrade mod (Read 35088 times)

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