Not a bad review, Yes a few quirks but at least it seems better than the name on it. Thanks Scott.

Always appreciate your insightful reviews. A couple suggestions to make them even better, try some fft measurements on your scope to characterize the harmonics. Also, if you do your x-y against a good reference generator, you can get an idea on jitter and drift. Just some thoughts…

@TheDefpom

Жыл бұрын

Thanks for the suggestions, I will try to remember them for next time.

Informative as usual👍

Is there an isolation rating on the power supply? Having a floating output could be useful, but I would not trust the power supply. With a floating external 5v supply in and bluetooth control the floating output could be very useful.

Thanks, for showing

Most unfortunate product name branding, perhaps the meaning was lost in translation, cheers.

I'm liking the external VCO and modulation inputs ... wish those external features were on my Siglent SDG2042X (hacked to SDG2122X!) that cost 3 times the price of the JDS8080.

Does this model have a trigger output for the start of its sweep function? The JDS6600 was EXTREMELY annoying in that it had the sweep facility, but there was no way to trigger a scope display to observe frequency responses! Anybody know a mod to fix this? [and the loose ground on this example is a real NO-NO, Junctek :( ]

@TheDefpom

Жыл бұрын

It is supposed to be a trigger in/out, maybe I should try it.

@JanCiger

Жыл бұрын

AFAIK, there is a trigger/sync signal on the TTL pin header in the back. It is all undocumented, so yay ... These generators are on the market in multiple variants for several years now, Junctek (formely Juntek) and Feeltech apparently poached each other's design sometime in the past and then there are lot of rebadgers. But all of these are the same design - a small FPGA driving an R/2R DAC (older models had literally a resistor ladder soldered there) that drives a cheap video opamp for the output. The signal level is very approximate, there is plenty of distortion due to the crappy DAC and filters, there is plenty of jitter in the signal due to the way they do the synthesis ... The only difference is that the newer models have slightly nicer UI with the color TFT display instead of the 2 line character LCD. There was even a model that has a firmware that literally bricked itself after a while - and the manufacturer refused to recall or fix it. The power supply problems (lack of earth, noise, poor quality capacitors, etc.) are also a never ending story with these devices, best not use the built-in supplies. There is plenty of information about these generators on the EEVBlog forum.

@hectorpascal

Жыл бұрын

@@JanCiger Many thanks Jan, I'll probe the TTL connector again! I didn't see a trigger before, but of course it may be firmware version dependent. One of the "amusing" things about the early units was that the resolution of the user-settable amplitude shown on the screen, FAR exceeded the accuracy of the base output level! And of course the "amplitude" value isn't really amplitude at all (i.e. A as in v(t)=Asin(wt)) Their "Amplitude" is actually the unterminated Vpp! But I guess the older versions were far better than nothing for hobbyists, considering their price. My lasting impression was that they were designed by DIGITAL engineers with little experience of ANALOG measurements! They have probably now got much better!

Great video Def. BTW, it's always baffled me the names some of these companies come up with. At least it's not Junktech. Maybe they were out of Ks...

@TheDefpom

Жыл бұрын

Yeah the name could be better, it is also interesting that they are also called Juntek, maybe there is something being messed up when converting from Chinese to English.

@fullwaverecked

Жыл бұрын

@@TheDefpom Yeah. Maybe we need to ask Paul? Cheers!

@hectorpascal

Жыл бұрын

Yes, I was surprised it was changed! "Jun" is a perfectly normal Chinese/Japanese/Korean given name, and adding the "c" simply gives some people a lot of scope for politically inspired mischief!

@fullwaverecked

Жыл бұрын

@@hectorpascal Yes, I agree. Better to go with JunSee... You see? Cheers! 😸😎😏🤟✌️

@fullwaverecked

Жыл бұрын

@@hectorpascal I spent 12 years in Japan, so... You know what I mean.

Before I get too far into the video, I have to say, a company that names themselves, *"JUNCTEK"* to me, doesn't build a lot of confidence in their products. I mean, if they are admitting, UP FRONT, that their products are JUNC (even if a different spelling) I for one would just not touch any of their stuff. Even to save a few bucks. I'll stick to name brands that have proven themselves. I noticed that the "links" to download their software doesn't use a domain name NOR is it secured!!! They are using an IP Address!! That does NOT instill much confidence at all! For one thing, if their ISP ever dumps them or they leave for another ISP, they can lose that IP address. They should have it registered in DNS. It's VERY EASY to do and literally takes 5 minutes. SKETCHY!!!

@TheDefpom

Жыл бұрын

Yes they do things in a bit of an odd way.

@andymouse

Жыл бұрын

" I mean, if they are admitting, UP FRONT, that their products are JUNC" No their not, it could be the owners bloody wife's name for all you know.

You can propably turn off the biper from ne of the option in fortware.

If I bought one I would want to attach earth closer to the BNC inputs. The earthing arrangements for Chinese equipment is an after thought not for safety!

@TheDefpom

Жыл бұрын

I don’t mind the separate earth terminal as such, yes it should have been done better though.

For fox' sake! Why would they call their company Junctek? 😅

@BlondieSL

Жыл бұрын

Just being honest, I guess. LOL 😅😂🤣 I sure wouldn't buy any of their "products". The build looks cheap too.

@fluffyfloof9267

Жыл бұрын

@@BlondieSL LOL, that's not quite it, i think. IMHO, they're just not aware of the similar pronunciation of words with completely different meaning. Technically, it could just be an engineer called Jun Cloud, or something - totally oblivious to the "junk". …they should've consulted an English speaker …or at least a PR/Marketing pro. 😅 yikes

@BlondieSL

Жыл бұрын

@@fluffyfloof9267 Lucky that his name isn't Dick Cox 😅😂🤣👏👍

Good idea getting rid of the floating output. I think I will modify all my PSU's and DMM's so the negatives are all forced to earth too.

I paid $113 USD delivered from China. I think it was a good deal.

Which is the recommended cheap signal generator for an absolute beginner?

@thomasw6169

Жыл бұрын

NE555 😀

....unfortunate company name.

Did anyone else notice at timecode 16:24, the options was Weavform instead of Waveform....typo... :)

@NebulaM57

Жыл бұрын

Just a quick update, I ended up purchasing the PSG9080 (Goupchn). So far it's been working great for me. However, I did notice I have the same mis-spelling of Waveform in the same place..Weavform. haha Must be same firmware (2.01).

Unfortunate choice of name brand for an electronic instrument...obviously not native English speakers.

Junkteck.....must be like "fragile" it's french....better than killmaster I guess

I'm pretty sure that the power supply, and the device as a whole, is classified as class ii isolated, so the casing earth terminal is purely functional I.e. no safety implications. That said, pretty poor workmanship, especially for a review unit. Makes one wonder what us average punters would get...

@yurkshirelad

Жыл бұрын

I doubt the review copy is any different from what you or I would buy.

junk tek

More Chinesium .......No thanks

How can this be a review? when you ain't reviewing anything.... is it even accurate?.. what kind of phase noise does it have,.. if there are tolerances.. does it deliver according to that?.. to sum up is it s good waveform generator ? does it perform as a 40 dollar unit, just with a heavy mockup? this is an unboxing and you turn it on, and turn some dials and take the casing off.. review? really.. I know it likely ain't you that decided that "Review" label, as all these smaller channels that were greased with this unit.. ALL got the exact same headline "Review" so likely some sugardaddy in China that decide in what level your bottom shall sit and the headline you need to be paraded with, but come on, Defpom.. your better then this.. check the unit... you ain't fresh of the boat in this field...

WILL YOU SPEAK SLOWLIER, PLEASE? (words per minute)

@TheDefpom

Жыл бұрын

How about now?

@vl5006

6 ай бұрын

The man is fine with ~30K channel audience for his 1.5K videos. Don't tell him what to do, don't be that toxic.

Now that you have the crappy Jun"C"tek JDS8080 you really do not need your JSG9080, so send it to me! :):):)

@TheDefpom

Жыл бұрын

Hmmm. No. LOL

Shout out to @AERVBlog