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Author Topic: Rigol DSA875-TG 9kHz - 7.5GHz Spectrum Analyzer Review, Teardown & Experiments  (Read 5913 times)

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Online Hugoneus

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Watch the video here: [1 Hour & 13 Minutes]
youtu.be/0wVlH1lPZdE

More videos at The Signal Path:
http://www.TheSignalPath.com
Shahriar Shahramian
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Offline JoeN

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Rigol DSA875-TG 9kHz - 7.5GHz Spectrum Analyzer & Tracking Generator Review, Teardown & Experiments
50 views 9 minutes ago

Will be watching that for sure.  Right after The Walking Dead.  A man's gotta have his priorities...   :P
Have You Been Triggered Today?
 

Offline AF6LJ

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Good review, thanks :)
Sue AF6LJ
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Offline TheSteve

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Enjoyed the video - I wouldn't say it was really a teardown, lol.

The various measurements and setup were nice to see though and they transfer over to many other spectrum analyzers.
VE7FM
 

Offline German_EE

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Nice, but a shame that we didn't get to see the analyzer front end. Were you worried about upsetting the calibration?
Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.

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Online Hugoneus

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Nice, but a shame that we didn't get to see the analyzer front end. Were you worried about upsetting the calibration?

Hi, sorry about that. I have been really stressed for time with a million ideas for new videos! So I have to rush a few things here and there. I thought focusing on experiments in this review would be more valuable.
Shahriar Shahramian
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Online Hugoneus

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The various measurements and setup were nice to see though and they transfer over to many other spectrum analyzers.

Yes, these are all the basic measurements you would want to do. Too bad it doesn't have a digital down-conversion stage.
Shahriar Shahramian
The Signal Path Video Blog
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Online Hugoneus

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Nice, but a shame that we didn't get to see the analyzer front end. Were you worried about upsetting the calibration?

I don't think that it would have a strong impact on the calibration either way... Once I get some more time, I'll take it apart more.
Shahriar Shahramian
The Signal Path Video Blog
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Offline uski

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I wonder if a DSA832 can be upgraded into a DSA875... ^-^
 

Online Hugoneus

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I wonder if a DSA832 can be upgraded into a DSA875... ^-^

99.999% (with a margin of 0.001% error) not possible.  :scared:
Shahriar Shahramian
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Offline _Wim_

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Excellent video as always! Very good information. Keep em comming...
 

Offline KE5FX

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Kind of a bummer not to see a real "teardown" on this one (likewise the Signal Hound unit from your other video.)  :-\  Glad to hear you're planning a follow-up.

Also, was that IEC power connector just a piece of plastic with contacts embedded in it, or was there a proper line filter?  If the former, all that nice shielding beneath the back cover was a complete waste of time/money on Rigol's part.
« Last Edit: October 22, 2015, 09:46:01 PM by KE5FX »
 

Online Hugoneus

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Kind of a bummer not to see a real "teardown" on this one (likewise the Signal Hound unit from your other video.)  :-\  Glad to hear you're planning a follow-up.

Also, was that IEC power connector just a piece of plastic with contacts embedded in it, or was there a proper line filter?  If the former, all that nice shielding beneath the back cover was a complete waste of time/money on Rigol's part.

Unfortunately no filter as far as I can remember.
Shahriar Shahramian
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Offline Tobias89

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Hello,

has anybody had any luck with unlocking all options on DSA875?

I would appreciate any help!
 

Offline ted572

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Hello Tobias89:

Do you see this issue reported by sv1eia in Re: Spectrum Analyzer - Rigol DSA815, « Reply #915 on: September 23, 2017, 09:30:13 AM »  Please go to -> http://www.eevblog.com/forum/testgear/spectrum-analyzer-rigol-dsa815/msg1308261/#msg1308261  to see his Screen Shots, etc if you have the time and opportunity.  If not no problem of course, and thank you.

'sv1eia' says the following:  When using the DSA815-TG to get a spectrum output from a HF transmitter, seen a strange spurious signal in the area of 14.3 MHz.

Specifically, when a signal is fed to the instrument, in the area around 14.3 MHz eg 14.25 MHz or 14.35 MHz, apart from the original signal there is also displayed another signal (mixing product?), for that see attached images 501/2/3/5/6/7. When feeding the instrument with a signal at exactly 14.3 MHz, then the observed phase noise gets beyond the instrument's advertized limits, for that see the attached image 504.png

To verify the problem, I replaced the HF transmitter with a lab signal generator, the DG1022Z.
Seen the exact problem again.  The screenshots attached are from that setup, DG1022Z transmitting into DSA815-TG and the problem is still there so it was not the HF transmitter.


I'm curious as to if you see this with your DSA875-TG?  Other users with the DSA815 also see this spurious response and I wonder if it is also in the DSA875.  If you have the time I appreciate your checking it, and if you don't, then I understand.  In any case thank you and I understand either way, Ted
 

Online Hugoneus

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I'll check! Hopefully I will remember...
Shahriar Shahramian
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Offline Wall-E

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I'll check! Hopefully I will remember...

Edit - While your checking something (whatever),
Could you please also do more of a teardown as you previously mentioned you would try to do.  It would be nice to see more of what is in there under the those shielded compartments.  At least pictures, or a video of the top sides of the hidden boards.           Thank you for consideration, Stijn
« Last Edit: October 12, 2017, 06:58:42 AM by Wall-E »
 

Offline KE5FX

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I'll check! Hopefully I will remember...

Edit - While your checking something (whatever),
Could you please also do more of a teardown as you previously mentioned you would try to do.  It would be nice to see more of what is in there under the those shielded compartments.  At least pictures, or a video of the top sides of the hidden boards.           Thank you for consideration, Stijn

Seconded.  You don't have to go into a lengthy dissertation on the low-level details, but at least show closeups of the board so that components and subcircuits can be identified in still frames.   :-+  Recent teardowns from all of the major YouTube stars have fallen well short in this respect.
 

Online Hugoneus

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I'll check! Hopefully I will remember...

Edit - While your checking something (whatever),
Could you please also do more of a teardown as you previously mentioned you would try to do.  It would be nice to see more of what is in there under the those shielded compartments.  At least pictures, or a video of the top sides of the hidden boards.           Thank you for consideration, Stijn

Seconded.  You don't have to go into a lengthy dissertation on the low-level details, but at least show closeups of the board so that components and subcircuits can be identified in still frames.   :-+  Recent teardowns from all of the major YouTube stars have fallen well short in this respect.

My repairs all do have teardowns! :)
Shahriar Shahramian
The Signal Path Video Blog
www.TheSignalPath.com
 

Online Mechatrommer

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I'll check! Hopefully I will remember...

Edit - While your checking something (whatever),
Could you please also do more of a teardown as you previously mentioned you would try to do.  It would be nice to see more of what is in there under the those shielded compartments.  At least pictures, or a video of the top sides of the hidden boards.           Thank you for consideration, Stijn

Seconded.  You don't have to go into a lengthy dissertation on the low-level details, but at least show closeups of the board so that components and subcircuits can be identified in still frames.   :-+  Recent teardowns from all of the major YouTube stars have fallen well short in this respect.

My repairs all do have teardowns! :)

while your videos are always of 5 stars class in term of knowledge etc, while the thing is taken apart naked it should take minimum time just to setup macro camera to capture all important sections of the boards. when the thing is assembled, it will take much more time if you have to re-open and then no interest anymore... captured pictures can be used for:

1) post in your website, not just for education and help people learn and make it as reference while in repair or design mode
2) but also to increase traffic to your website. or forum..
3) you can use for yourself later as reference or materials to include in your future videos.
4) no need to tear apart again in case any discussion about the device rise again in the future. and many more...

you have multi thousands devices on your desk it should be no problem for you like getting one Canon EOS 1Dx and a macro/close-up lens and a good tripod for the job right?. besides, the 1Dx you can bring along when walking the town or park and then people will start staring, and you just say you are journalist or whatever doing documentary and survey on fame and famous magazine or science discovery or whatever, then it should be easier for you to score some chickens ;) now the later part is just a joke...
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Online technogeeky

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I'll check! Hopefully I will remember...

Edit - While your checking something (whatever),
Could you please also do more of a teardown as you previously mentioned you would try to do.  It would be nice to see more of what is in there under the those shielded compartments.  At least pictures, or a video of the top sides of the hidden boards.           Thank you for consideration, Stijn

Seconded.  You don't have to go into a lengthy dissertation on the low-level details, but at least show closeups of the board so that components and subcircuits can be identified in still frames.   :-+  Recent teardowns from all of the major YouTube stars have fallen well short in this respect.

My repairs all do have teardowns! :)

while your videos are always of 5 stars class in term of knowledge etc, while the thing is taken apart naked it should take minimum time just to setup macro camera to capture all important sections of the boards. when the thing is assembled, it will take much more time if you have to re-open and then no interest anymore... captured pictures can be used for:

1) post in your website, not just for education and help people learn and make it as reference while in repair or design mode
2) but also to increase traffic to your website. or forum..
3) you can use for yourself later as reference or materials to include in your future videos.
4) no need to tear apart again in case any discussion about the device rise again in the future. and many more...

you have multi thousands devices on your desk it should be no problem for you like getting one Canon EOS 1Dx and a macro/close-up lens and a good tripod for the job right?. besides, the 1Dx you can bring along when walking the town or park and then people will start staring, and you just say you are journalist or whatever doing documentary and survey on fame and famous magazine or science discovery or whatever, then it should be easier for you to score some chickens ;) now the later part is just a joke...

I agree with your sentiment (and I suspect Hugoneus does too), but he's a busy man and he's already using a lot of his free time for TSP. If this isn't a strong enough argument, then an easier argument are the combined facts that:

  • he often repairs things whose calibration can be disturbed (or ruined!) by opening internally shielded parts
  • he often doesn't need to open every shielded part in order to do the repair

I think it would be silly to request that he do things which could damage the calibration of his own equipment for the sake of our educational (or equipment repair) opportunities.

In any case, it is not our role to tell him what to do. One does not walk into one's classroom and start making demands of the teacher.
 

Online Hugoneus

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I certainly agree with the sentiment, but of course time is limited.
Shahriar Shahramian
The Signal Path Video Blog
www.TheSignalPath.com
 

Offline AF6LJ

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There is too much at risk, this stuff costs money..
Take it from someone who has spent her career repairing expencive gear, and taking chances at home on broken items and thinking of it as an investment on one's career.

Those days are past. :)

Sue AF6LJ
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Online Mechatrommer

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I certainly agree with the sentiment, but of course time is limited.
i dont get this, you can talk for hours in front of the video, but cant snap pictures just for a minute. another benefit is you can snap a picture before teardown and later if you cant assemble it back, you can refer back to the original assembly picture to know which screw goes to where, i always did this.. but well, this is not a demand, just a humble suggestion. its not wrong to not do it, ymmv.

There is too much at risk, this stuff costs money..
that thing is already broken dude. he can gain patreon supporters :P

but about the repair video, thats a big thumbs up, who knows i might someday buy a broken SA and when the prognosis shows similar symptom i might fixing something that is totally irrelevant, if without watching this video...
if something can select, how cant it be intelligent? if something is intelligent, how cant it exist?
 

Offline tmbinc

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I will second the suggestion to provide high quality teardown _pictures_ - Hugoneus, I _love_ TSP, mostly for the fact that it allows me to peek into devices that are too expensive for most other people to open up. And I'm very thankful for your work! I know TSP must be an even larger time sink than it is a money sink, so it feels really bad to give a suggestion that would require you to spend even more time on it.

For example in the MDO4000C review, you did a full teardown, but then the resolution of the video wasn't good enough to identify a few parts that I always wanted to know what they are ("unpopulated mystery device" in https://photos.google.com/share/AF1QipO476qh31x8zEEjAioZGXwLE8N_c5yuo6B3rg4k55-MQk-gu35gzyiasX5_aQCPfw/photo/AF1QipNmGJ5eG6rrdl6JyVaks7f8WoFbTegYycS1BEzu?key=OXR1c0VUdEdEOU45aG5QdmdId1hLejNCOWRqS3ln - based on the housing I suspect it to be a clock generator?).

Pretty likely a photo of the board in the same setup would have been sufficient (and would provide an excellence archive for repairs), as I failed really hard to image-process this from the video - the resolution just isn't there.

But then, if I had to chose between better teardown pictures at the cost of fewer TSP episodes (or Hugoneus becoming pissed at us because eevblog forum people behaving as ungrateful pricks :) ) - let's not focus on this too much.
 
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