Author Topic: Question: which cheap function generator should I get?  (Read 1151 times)

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Offline Fireflaker

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Question: which cheap function generator should I get?
« on: September 24, 2020, 11:49:55 pm »
FY6900 or ATTEN ATF20B DDS for the exact same amount of money(110USD)?
Attached are the links to the datasheet for each.
http://en.feeltech.net/index.php?case=archive&act=show&aid=65
https://www.diverseelectronics.com/upload/documents/ATF20B.pdf

The 60MHz 250Msa one should technically be better according to the spec, but it looks so much more cheaply made than the 20Mhz alternative. The 20Mhz also goes for a higher price when new. Is there some features the cheap 60Mhz one is missing? such as adjusting output impedance. Or should I trust it?

Many thanks!
 

Online ledtester

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Offline rsjsouza

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Re: Question: which cheap function generator should I get?
« Reply #2 on: September 25, 2020, 01:31:46 am »
I don't know how the Atten, but the version of a few years ago has a limitation on the triangle and square wave. A review and teardown are shown below:

https://www.eevblog.com/forum/testgear/atten-atf20b-teardown/

I have a Feeltech FY6600 of 30MHz that has a few issues but it works well.
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Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 
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Online alextwin007

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Re: Question: which cheap function generator should I get?
« Reply #3 on: September 25, 2020, 04:50:58 pm »
I second ledtester, I have the UNI-T UTG962E and I'm very happy with it.  Although it is a bit more expensive and I haven't had the other ones your considering to compare it to.
Having a test equipment addiction is difficult when you don't have a lot of room.  The solution, only collect small adorable test equipment.

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Offline Fireflaker

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Re: Question: which cheap function generator should I get?
« Reply #4 on: September 26, 2020, 08:11:24 am »
Thank you very much for your reply!!
 

Online Labrat101

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Re: Question: which cheap function generator should I get?
« Reply #5 on: September 26, 2020, 09:14:33 pm »
 I would recommend the UNI-T UTG962 or 32

 I have just ditched my FY series as its buggy bad power supply etc and Jitter and
 a load of other thing in including FAKE chips  . Even after modding it with an OCXO,
 upgrade Power supply .   etc.etc   |O   :horse:  :-BROKE

  the UTG 900 series just work great out the box .  :-+
 They have a lot of professional functions that you wont get on any of the FY crap.
 The only down side I can possible find is that the Minimum rise & Fall time on the
 square wave is 15ns . (really no big deal)
All the wave forms are steady & clean .  No Jitter .  :-+
 Recommend you read the manual from uni-trend.com .

 I have had my UTG962 only a few days and ran almost every test I can think of .
 and its a well built. Clear screen , and small foot print .

Will out rank any of the
 FY68 / 69 etc.  That are the worst money wasters on the market .
 Plus there safety standards are Zero to None 

 Have Fun
 :popcorn:
 
« Last Edit: September 26, 2020, 09:59:37 pm by Labrat101 »
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Online precaud

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Re: Question: which cheap function generator should I get?
« Reply #6 on: September 27, 2020, 02:22:29 pm »
Depends on what you need it for. My primary tools are network and impedance analyzers so the function generator doesn't get used much.

I picked up a BNIB 60MHz FY6900 in the BuySell forum for about half price, from someone who thought it was a POS, to use while I repair the HP generator I prefer. I fixed the earth wire issue and restored the ground wire they removed, and it works fine for my needs. I wedge it in place on the shelf so it doesn't move around when connecting cables or using the controls. I don't like the user interface of any of the new-gen arbs, but it's not a deal-breaker for occasional use.
« Last Edit: September 27, 2020, 03:51:39 pm by precaud »
 

Offline Archades

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Re: Question: which cheap function generator should I get?
« Reply #7 on: September 28, 2020, 05:07:42 am »
Would you get the UNI-T UTG962 (edited to make people know 962 is 60mhz) 60mhz version vs the JDS6600? Also would you choose that same one vs the 2 or 3 FY 6600, 6800, 6900 gens?

Been reading a fair few posts and trying to find a $200AUD or less AWG to learn with...soo many opinions. Was gonna get hte JDS6600 but I'm hearing there is better for the money?

I have a Siglent sds1104x-e and I'm still learning, $200 is kinda my max as it's more a desire than a true need at the moment. Not ready to splash the extra for the Siglent SDG2042X type stuff lol. Still in shock over buying the scope but so far it looks really really really nice. Would like a gen that I will be happy with as a beginner/moderate and does the job enough to learn. I've read quite a lot of posts and can't really get an updated 2020 consensus on what people are buying either, I'm guessing the OP is just as confused as I am.
« Last Edit: September 28, 2020, 06:01:09 am by Archades »
 

Online Mechatrommer

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Re: Question: which cheap function generator should I get?
« Reply #8 on: September 28, 2020, 05:25:35 am »
Would you get the UNI-T UTG932 60mhz version vs the JDS6600? Also would you choose that same one vs the 2 or 3 FY 6600, 6800, 6900 gens?
UTG932 is 30MHz version... for small addition of money, 60MHz version is UTG962, dont make noobs mistake that you and us will later regret. and if you've read enough, you should clearly know by now which one needs extensive modification which one just works right out of the box and better buttons/GUI interface. cheers. ;)
It's extremely difficult to start life.. one features of nature.. physical laws are mathematical theory of great beauty... You may wonder Why? our knowledge shows that nature is so constructed. We simply have to accept it. One could describe the situation by saying that... (Paul Dirac)
 

Offline Archades

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Re: Question: which cheap function generator should I get?
« Reply #9 on: September 28, 2020, 06:17:10 am »
Whoops, that's what I get for posting whilst having gallbladder attacks haha.

Just for clarity, the UTG962 is the one to get that beats the others? Pain meds are making the brain a bit slow haha. I've seen the fy series have issues with internal power, the JDS some have said the signal output is bad, so far I can't find anything bad about UTG962 except it was out of stock and hard to find info on?

Just read through your thread, lots of good info, thanks. Looks like the UTG962 is the best bang for buck for noobs? 
 

Online tautech

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Re: Question: which cheap function generator should I get?
« Reply #10 on: September 28, 2020, 07:07:04 am »
I have a Siglent sds1104x-e and I'm still learning, $200 is kinda my max as it's more a desire than a true need at the moment.
To enable some more capability of your scope consider the SAG1021I 25 MHz AWG.
These connect to the scopes USB and you drive it from within the scopes UI.

It will give you all you need for functionality to explore the capability of the X-E plus provide a PlugnPlay signal source for the Bode plot feature.

Trio appear to be outta stock of these though:
https://www.triotest.com.au/electronic-and-rf/waveform-generator/accessories/siglent-sag1021i-hardware-25mhz-function-arbitrary-wavef-orm-generator
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Offline paulbt

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Re: Question: which cheap function generator should I get?
« Reply #11 on: September 28, 2020, 07:48:16 am »
@Fireflaker

Hello!
A few months ago I was searching for a basic function generator and I end up buying this the GW Instek AFG 2005 from TME. It can only go up to 5MHz, but my main requirements were to have the option to select between High-Z and 50Ω load and to have a "Sync" output. The build quality inside I have no clue how good it is, but on the outside it feels very robust, simple menu, rough power button, nice keypad, the rotary knob has a nice feedback and the bnc connectors are strongly attached to the front panel.
Hope it helps...
"Simplicity is the ultimate sophistication."  Leonardo Da Vinci
 

Offline Archades

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Re: Question: which cheap function generator should I get?
« Reply #12 on: September 28, 2020, 07:51:34 am »
What's the diff between the SAG1021I and SAG1021?
 

Online Mechatrommer

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Re: Question: which cheap function generator should I get?
« Reply #13 on: September 28, 2020, 07:58:36 am »
Just read through your thread, lots of good info, thanks. Looks like the UTG962 is the best bang for buck for noobs? 
i wont say UTG962 beats the other or such... different people with different need and interest, modding PSU and FG output is not a big deal to me, i built my own diy FG and front amplifier output before. the one thing that put me off when looking at FY thing is it doesnt have dedicated numeric buttons, that will make me difficult to jump between frequencies quickly. and by coincidence i have a small space allocated underneath my DSO for my previous diy FG that normal sized FG/AWG wont fit, let alone the boat anchor grade RF-Gen from HP/R&S/Anritsu (i wish to have them but i dont have much space) so UTG's dimension is my 2nd bonus. and 3rd bonus is i always wondered how to make dual rails PSU from single Vdc, esp the commonly used 5V USB level, now i know by dismantling and rev.eng UTG AWG and implemented it in my projects. so with those facts, i'm willing to pay twice the price of FY, ymmv.

@Fireflaker

Hello!
A few months ago I was searching for a basic function generator and I end up buying this the GW Instek AFG 2005 from TME. It can only go up to 5MHz, but my main requirements were to have the option to select between High-Z and 50Ω load and to have a "Sync" output. The build quality inside I have no clue how good it is, but on the outside it feels very robust, simple menu, rough power button, nice keypad, the rotary knob has a nice feedback and the bnc connectors are strongly attached to the front panel.
Hope it helps...
the Hi-Z vs 50 ohm load menu setting is just to tell the FG what load its looking, it cant tell (sense) automatically, i'm not sure about high end model, with automatic sensing, there should not be a menu for that, it will just show you the right output level and load seen. for entry level FG, the output is always 50 ohm impedance with same signal, putting 50 ohm load to it will halve the signal level, and this will be shown correctly if you choose the right load in menu setting. UTG962 has this menu setting as well, like other normal entry level FG, i suspect FY series should have too.
It's extremely difficult to start life.. one features of nature.. physical laws are mathematical theory of great beauty... You may wonder Why? our knowledge shows that nature is so constructed. We simply have to accept it. One could describe the situation by saying that... (Paul Dirac)
 
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Offline Archades

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Re: Question: which cheap function generator should I get?
« Reply #14 on: September 28, 2020, 08:02:15 am »
Does the SAG1021L hardware actually come with the software code to run it, or do you have to spend the $292 + pay a few hundred more to run it?
 

Online Mechatrommer

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Re: Question: which cheap function generator should I get?
« Reply #15 on: September 28, 2020, 08:56:23 am »
be aware that while it sounds good being able to interface with your dso brand...
1) if the DSO go, the FG will go as well
2) at 20MHz max, it doesnt work/match well enough imho... esp when dso can go to 100MHz
3) not being able to stand alone (no LCD) will make some situations worse

you can bode plot (magnitude) with different FG brand.. i just posted it somewhere, UTG962 sweep to get DUT respond to 60MHz...

from https://www.eevblog.com/forum/testgear/juntek-psg9080-programmable-signal-generator-(80-mhz-300-msas-14-bit)/msg3252672/#msg3252672


if you want really bode plot with phase (impedance analysis) you can hand calculate/eyeball or some semi automated programming (DSO + FG + PC SW) but i'm not aware a individual hobbiest has made a PC software for Siglent DSO.
It's extremely difficult to start life.. one features of nature.. physical laws are mathematical theory of great beauty... You may wonder Why? our knowledge shows that nature is so constructed. We simply have to accept it. One could describe the situation by saying that... (Paul Dirac)
 

Online Labrat101

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Re: Question: which cheap function generator should I get?
« Reply #16 on: September 28, 2020, 11:05:33 am »
The UNI-T UTG 932 or 962
 Both work out the Box and have a full warrantee form Uni trend  .

OEM  link from https://www.aliexpress.com/item/4000373256414.html?spm=a2g0s.9042311.0.0.2b034c4dZU1VGJ 

Personalty I'm not easily impressed  But this UTG962 is really impressive and the spec's are correct.
 Value for money .Yes .

 FY 68 / has FAKE & dodge chips so upgrading does not  Help .. Been there done that .
 FY69 is the same animal in a different box with a software update to compensate for the Bugs and
 poor PCB design etc etc.

There are over a 1000 pages on this forum on the FY66/ ++  which was the first version .
which does respond to Upgrades . maybe the main Cyclone is better and not a Fake .
 I bought the FY68  about a year back . The power supply literary  went up in smoke after 2 hours
of Run time . Feeltech never replied to my emails . The supplier gave me a 30% refund and said
 find some one to fix it  :-DD  ..
So if you want to put your well earned money on a No guarantee that it will even work when you receive it .
 Go for it  .
The other similar looking AWG 's are properly rebrands as the menus and the insides look very similar.
 (Clones of Clones)

 If you are learning over time you will want to upgrade say your DSO as your knowledge grows
 So if you learn on equipment that is good . and may last you 5 to 7 years .
 You don't always need the very best scope on the market If your working in low frequents
ranges say up to 5Mhz .
Remember one rule of thumb you need a scope at least  x10  bandwidth of frequency required .
 
 Good tools will give good results . 
  Buy from Brand Names of Know established companies .
    We all love a bargain but if the Data spec's looks better than High end Equipment
     Its a P.O.S

BTW update . UNI Trend has patent A square wave design that's on there new model
 that goes to 70Mhz Square  That would out rank a lot of competitors .
 I read there write up on this looks impressive . I not sure when the release date is.
  I guess it will be good $$ as well .
« Last Edit: September 28, 2020, 01:27:03 pm by Labrat101 »
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Online tautech

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Re: Question: which cheap function generator should I get?
« Reply #17 on: September 28, 2020, 07:51:41 pm »
What's the diff between the SAG1021I and SAG1021?
SAG1021I is the new isolated output version and SAG1021 has been discontinued.

Does the SAG1021L hardware actually come with the software code to run it, or do you have to spend the $292 + pay a few hundred more to run it?
Depends on just how resellers price it.
Technically the AWG capability for X-E scopes is in 2 parts, the HW and SW each with their own prices however you get 30 trial uses before you need to buy permanent licensing.
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