Siglent SDS1202X-E compensation issue (and other manufacturers ?)

[Diabolo]

Hello,

@Eurofox
We should give / share the link Siglent to get these 2 capacitors to give us the opportunity to fix the problem.
-----
The member who said that 3.9pf capacitors were easily found at the local republisher, he does not know what he says!
Even our Russian friends talk about it!
Siglent must be able to deliver these 2 capacitors, it will cost him less than to take the SDS 1202X-E "defective"!
Why Siglent does not put on the Web a Siglent site to him (where on aliexpress, Banggood, alibaba, etc. ..) where to get these famous capacitors 3.9pf NPO / CGO 500V at low price?

For now, at Mouser.com you have to pay $ 26 to get these 2 capacitors!

Russian site:
http://m.radiokot.ru/forum/viewtopic.php?p=3217036

Regards,
Diabolo

[eurofox]

I just got an email from Siglent, I never contact them but they got my email address from my supplier.

I got confirmation that they will send the capacitors when they are available next month.

They fully maintain the warranty.

  for Siglent.

[Diabolo]

Hello,

I tried my luck by mailing to my reseller and sending an email to the Shenzhen factory in China.
I'm waiting to see their answer.

Diabolo

[001]

3.9 pF is not a rocket sience
When I was yong and no any webshops i made my own small values capacitors from twisted wire and glue

[Diabolo]

Hello

I contacted Siglent and I must receive in December the 2 condesateurs 3.9pf COG / NPO 500V SMD1206.
Siglent replied as soon as he received my email.
I see again my judgment and I recognize that Siglent is listening to its customers and their problem.
I misjudged Siglent and I apologize to them.
As soon as I have soldered the capacitors I will have a perfect SDS1202X-E and will consider buying their SSA3021X spectrum analyzer.

Regards,
Diabolo

[Digby]

The real question is how long will it be before all units available have the new board?

[Ghislain]

^^ Tautech answered that in post #138 :

@ tautech , do you know from what serial number off. ?
Units with BB in the build code that is part of the full SN# are from HW revision to remedy the input compensation issue. At this time there has been ~3 weeks production since changes were made.

[Digby]

I meant, how long until you can be SURE that any SDS1202X-E you buy WILL BE a BB model.  According to Siglent, they will not be getting a  (their first?) shipment in until February. So, it will be a while. I was told they could get me one by December, but they can't. I went ahead and bought a Rigol 1054 instead. (at a fantastic price)  The folks at Siglent were very kind to offer me a new one, but it would take longer than I want to wait.

[tautech]

I should have some new units late next week fresh from the factory and of course I'll be checking that they're late SN# units. I don't get my orders by the shipping container load so they come pretty quick airfreight.

The new SDS1104X-E 4 channel models will be with them. 

[Welectron]

We will have updated SDS1202X-E available mid of next week.

[evgen.05]

hello! Who knows where can i buy this capacitors in Russia? Maybe from ali or ebay.

[Mr. Scram]

hello! Who knows where can i buy this capacitors in Russia? Maybe from ali or ebay.

Ask Siglent, they will provide them.

[evgen.05]

Ask Siglent, they will provide them.

Thanks, I'll try

[rf-loop]

hello! Who knows where can i buy this capacitors in Russia? Maybe from ali or ebay.

Ask Siglent, they will provide them.

Yes. They NEED be C0G (NP0) and least 500V.  Do you trust ebay sellers they know what are they selling.

From Siglent you get trusted quality ceramic capacitors for this.

There is so many sellers in ebay and ali who do not know anything about what they are selling. And if you buy small amount, they do not have any trusted label what they are.  Imagined case in ebay: "Oops, one 0 missing...so sorry.... is this one 0 important for you" (50V vs 500V) . Many times components are not what they tell or least it can not trust.  If you buy yourself, it is best to stay with big brands with good reputation, example Vishay etc from trusted source.

So if you can wait bit, perhaps it is wise to wait Siglent.
I do not know what time Siglent EU office have these components for send to customers. I believe quite soon.

[borjam]

From Siglent you get trusted quality ceramic capacitors for this.

There is so many sellers in ebay and ali who do not know anything about what they are selling. And if you buy small amount, they do not have any trusted label what they are.  Imagined case in ebay: "Oops, one 0 missing...so sorry.... is this one 0 important for you" (50V vs 500V) . Many times components are not what they tell or least it can not trust.  If you buy yourself, it is best to stay with big brands with good reputation, example Vishay etc from trusted source.

So if you can wait bit, perhaps it is wise to wait Siglent.
I do not know what time Siglent EU office have these components for send to customers. I believe quite soon.

I was told by Batronix to wait, as Siglent is supposed to send them replacement mainboards.

I rather prefer my fix to be done by Siglent without losing warranty. After all it's a design/manufacturer error.

But so far everything points at Siglent honoring warranty, which is good of course. Not upset about the time, I understand that there are logistics to take care of.

[tautech]

I've reworked a couple of units lately, installing the caps Siglent has sent me.

Allow at least an hour to dismantle, remove the mainboard, do the rework soldering, connect for adjustments, adjust, replace front end shield covers, full reassembly and self cal.
It is NOT a five minute job.

Trimmers will likely need a couple of tweaks for each of the recommended 1.2 and 12V 10 KHz square waves to successfully trim the input compensation correctly.

Rework tips.
A 3mm chisel tip is what I've used but smaller would/could be better. There's not a lot of room on the shield side of the caps so a hoof type tip could make things tight. Sus out the best tip you have for the job before starting.

Pads have solder already on them.....leave it there.
Add liquid flux to the pads, place cap with tweezers and then pin it in place with a small screwdriver, then touch iron on one end.
More flux, then add a very little solder to the iron tip and touch the other pad.
Rotate the mainboard for best comfort as you go.
The thermal mass of pads closest to the shielding is highest so dwell a little longer to ensure a nice joint.
Clean the rework with IPA taking care not to drown the trimmers in it.

Actual rework soldering takes only a few minutes, five minutes tops.
 
If you're not confident with SMD work, think twice before proceeding !!!

[evgen.05]

Ask Siglent, they will provide them.

Hmm, Siglent doesn't response on my questions. Maybe anyone know e-mail with support?

[skander36]

info-eu@siglent.com

[tautech]

Ask Siglent, they will provide them.

Hmm, Siglent doesn't response on my questions. Maybe anyone know e-mail with support?

Contact the Hamburg branch, they best suit your location and timezone.
http://www.siglenteu.com/lxwms.aspx?id=1110

[evgen.05]

Ohh, great. Siglent doesn't sent the capacitors in Russia or Ukraine. Just in Europe, USA or Australia.
Maybe someone in EU can help with whis? I'll pay for that. SDS 1202x-e is the last thing that i bought from Siglent.

[skander36]

I'll think this will do the job .
http://ru.farnell.com/avx/sqcb7m3r9batme-500/cap-rf-hi-q-3-9pf-500v-1210/dp/1301966

[evgen.05]

I'll think this will do the job .
http://ru.farnell.com/avx/sqcb7m3r9batme-500/cap-rf-hi-q-3-9pf-500v-1210/dp/1301966

2 capacitors with delivery will be 25 euro.

[rf-loop]

I'll think this will do the job .
http://ru.farnell.com/avx/sqcb7m3r9batme-500/cap-rf-hi-q-3-9pf-500v-1210/dp/1301966

SQCB7M
Is it so that M is not NP0
I think A is NPO (COG)

[mr.fabe]

@ tautech , do you know from what serial number off. ?

Units with BB in the build code that is part of the full SN# are from HW revision to remedy the input compensation issue. At this time there has been ~3 weeks production since changes were made.

Hello,

I understand that this affects units with BB in the serial number.  I'm not too clear if the previous units are affected as well.  I have a unit with HW Rev 00-01 (purchased Aug 2017) with serial # SDS1EBAX1Rxxxx and wondered if the issue affects me as well.

Thank you

Sent from my XT1575 using Tapatalk

[tautech]

@ tautech , do you know from what serial number off. ?

Units with BB in the build code that is part of the full SN# are from HW revision to remedy the input compensation issue. At this time there has been ~3 weeks production since changes were made.

Hello,

I understand that this affects units with BB in the serial number.  I'm not too clear if the previous units are affected as well.  I have a unit with HW Rev 00-01 (purchased Aug 2017) with serial # SDS1EBAX1Rxxxx and wondered if the issue affects me as well.

Thank you

According to my documentation, yes. It is more noticeable in some units than others.

Carefully compensate the probes at 1V/div the switch to 2V/div and you can see how much the issue will affect your usage. Then decide if you can live with it or not. Contact your supplier or Siglent US in Ohio for a remedy if needed.