1GHz scope

Thread Starter

tindel

Joined Sep 16, 2012
769
So I won the lottery and won a small contract to do some power supply design using GaN transistors, and now I need a real scope.

At previous employers, I've used Tektronix scopes for this type of development, but considering the insane price of the probes (IsoVu Isolated Probes | Tektronix), and somewhat small budget of the contract, I have to consider other methods for testing (math functions, single probe testing, etc.)

Requirements:
Minimum: 1GHz, Power Analysis features, Bode Plots (and function generator), Segmented Memory, reasonable Sample Depth (doesn't need to be too big though - this spec is a little overrated IMHO with segmented memory)
Nice to haves: MDO - I2C, CAN, High Speed Parallel Bus
Price point: Somewhat open, but I have a budget in mind.

I'm mostly looking at Keysight, Tektronix, R&S, and Lecroy. I've used Keysight and Tek scopes a lot, and am pretty familiar with their user interfaces and pros and cons. I've never used R&S and Lecroy though - so was curious to get input from others based on their experience. I've also thought about buying used - any experience here? Have folks had success negotiating lower prices or additional gear when you're spending this kind of money on a scope?

Really not interested in third-tier manufactures (Rigol, Siglent, etc), and will not consider them. I'm just not interested in hacking, buggy firmware, etc. I need professional gear.
 

rsjsouza

Joined Apr 21, 2014
291
In power supply design you may not need deep memory, thus a Keysight DSOX3104T or DSOX4104A could work (I tend to prefer the DSOX4000 series just because of the form factor of the display) - the used option mentioned by @nsaspook is quite interesting. You can also take a look at Keysight's official eBay store.

Back in 2019 I had a chance to play with the new Tektronix models MDO3 and MSO4 but I found them terribly slow. Some other folks reported the situation did not improve much better even after a few firmware updates.

A few years ago I had the opportunity to play with a R&S (RTA4000) and both its functionality and interface were quite good, but they are very expensive.

Good luck in your quest.
 

Wendy

Joined Mar 24, 2008
22,328
Becausr the TS specifically asked you not to refer to Siglent and you did it anyhow. Next step is a thread ban, which leaves you unable to interact with this specific thread.
 

tautech

Joined Oct 8, 2019
196
Becausr the TS specifically asked you not to refer to Siglent and you did it anyhow. Next step is a thread ban, which leaves you unable to interact with this specific thread.
Hmm, maybe you did not fully read my reply before deleting it in haste ?
I informed the OP many LeCroy models are in fact Siglent rebrands and suggested a model that was best bang for buck in this class of DSO.
What the OP chooses in the end is their business as we can only inform them of what's in the marketplace for them to consider.

As you own a Siglent yourself you could well have stated the OP's view they are full of bugs is misguided but instead you delete an informative post.
 

Thread Starter

tindel

Joined Sep 16, 2012
769

Thread Starter

tindel

Joined Sep 16, 2012
769
In power supply design you may not need deep memory, thus a Keysight DSOX3104T or DSOX4104A could work (I tend to prefer the DSOX4000 series just because of the form factor of the display) - the used option mentioned by @nsaspook is quite interesting. You can also take a look at Keysight's official eBay store.

Back in 2019 I had a chance to play with the new Tektronix models MDO3 and MSO4 but I found them terribly slow. Some other folks reported the situation did not improve much better even after a few firmware updates.

A few years ago I had the opportunity to play with a R&S (RTA4000) and both its functionality and interface were quite good, but they are very expensive.

Good luck in your quest.
As you and nsaspook suggest, I have been watching the used market off and on for several years (dreaming mostly). I've been eyeing the MSO3104A for a long time. 4000 series hasn't gotten me too excited since the screen resolution isn't increased at all, but I could see how the larger form factor is beneficial. I've considered the 6000 series, but it's a bit out of my price range I think - but there's a used one that I could probably swing.

Do you have any pros/cons of the R&S4000? I did see that they had a special that had a fully loaded 4000 series for $10k. R&S Oscilloscopes Promotion | Full Bench. High Value. | Rohde & Schwarz (rohde-schwarz.com) Hard to beat a new scope and 3 year warranty with 1GHz BW for that price. Banner specs are a bit better than the Keysight too.
 

rsjsouza

Joined Apr 21, 2014
291
4000 series hasn't gotten me too excited since the screen resolution isn't increased at all, but I could see how the larger form factor is beneficial.
This is just my personal opinion, but I like when the graticule is comprised of squares, not elongated rectangles. Both the 4000 and the 3000 share the same screen resolution, but the 3000 has a 16:9 aspect ratio, which turns the graticules rectangular. The 4000 has a 4:3 aspect ratio just like the older TVs.

Do you have any pros/cons of the R&S4000? I did see that they had a special that had a fully loaded 4000 series for $10k. R&S Oscilloscopes Promotion | Full Bench. High Value. | Rohde & Schwarz (rohde-schwarz.com) Hard to beat a new scope and 3 year warranty with 1GHz BW for that price. Banner specs are a bit better than the Keysight too.
Unfortunately I was not able to do actual work with it, thus any comments from the are pure impressions and quick attempts to do things while I had time in front of it. I can tell it has a very nice screen, is very responsive, you can split the waveforms in small windows around the screen (although you can't necessarily resize them) and the low speed serial decoder that I looked seemed to work well (SPI). It also looks quite well built. Unfortunately that is all I can tell from what I remember.
 
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