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- Опубликовано: 19 июл 2024
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Thanks for doing this video. I'll be waiting for the update, as I just purchased that same generator. It will be interesting to see your changes for a PSU. I replaced that same return wire, but mine wasn't as big as yours. I installed a fan from a zener float, the extra caps seemed to help clean the circuit. It was also missing a heatsink. As always, great video! :-)
I've been watching various reviews on these cheaper Function Generators and SDG has been very helpful in choosing one for me in 2023. I'm a hobbyist and purchased the East Tester ET3360C 60Mhz unit. It was delivered this morning (10 day delivery) and I have to admit I'm very happy with my purchase. The unit has a very small screen but is easy to read. This particular unit will do modulation for radio tuning but I will mainly be using it to drive TTL clock frequency. There is a drop off I'm aplitude after 30Mhz Sine but that is to be expected. I'm very happy with my East Tester ET3360C.
This comes out just as I ordered the 6800, nice :)
Hello Steve! This is the best overview of the generator FY6900 on RUclips. Thanks. You like it from me.
Steve, I have the 6900 and my oscilloscope showed substantial switching noise. I installed a torroid in the 5 volt line with capacitance after to 0 volts. The noise was very low after and my ham radio no longer saw the noise.
Gerry Rousseau
Thanks Steve!
Thanks verry much Steve. I ordered this generator as it's surely good enough for me, beside
i was thinking of building one myselve basicly using the same (Cyclone-4 ans ARM controller) solution.
Than this one came along... saves me some time.
Thanks for the info,, I remember the mods you did to your old one and I had followed your lead! I would gladly pay 10 to 15 more for a liner power supply although building one is not a problem but still it would be nice if it would come with one from the start. Thanks again!!
Seems like good value for money. Certainly it can serve well for an enthusiast or hobbyist, not for industrial use and I don't think it is intended to. I would appreciate a follow up in-depth review.
I purchased the FY6600 last year and rebuilt the PSU. It came with a 2 prong power socket which I replaced with a 3 prong. Furthermore the output caps on the PSU were only 16V rated and the rails were measuring 15V. I decided at that point to replace the PSU completely.
Same. I got the 3200 and built a regulated linear psu for it.
3200 what?
Thanks for the review Steve and it seems not a bad little unit for the price. Still a shame though when test equipment is light with virtually
nothing inside. I suppose as long as it works though..
Cheers
John
I believe standards call for ground wire to be the same gauge or thicker than mains. That way in case of “catastrophic failure” it would be able to carry all of incoming mains current to the earth and not blow up like the fuse. Here the ribbon cable looks about 22 gauge when mains looks at least twice thicker.
It's a shame they 'have gone for the same crap supply, like you I made a linear P/S for the last model, I will be interested in what you come up with, nice video
Will be looking forward to your next video on this, have just purchased this model and would very much like to make the suggested modifications. Would be nice to do the output of a transformer into buck converter modules but will probably knock up something akin to your FY3224S regulator circuit if that's what you end up doing, at this point i'm just gonna sheeple it and do what you do lol The only thing i'll do different if you go down the regulator route is JLPCB it for a more neater result... I just have a fetish for Red PCB's :-)
Try to not direct BNC cable connect between the FY6900 and a 'scope, say to observe or test the FY6900 wave forms, timing and other features. Ringing will likely occur , occluding and changing wave-forms, etc. Instead, utilize the properly compensated 'scope probe(s), and one will receive and observe a great deal improved wave-forms.
As a power electronics enthusiast, that power supply make me sick. Even the 5$ ones at AliExpress are good enough. How much could they be saving with that thing? I bet less than a bloody dolar...
Seems like they were taking their design style from Rigol scopes when you look at them side by side. Thanks for your review.
The 5V+12v,-12v are pretty common voltages, you can easily build a small lnear PSU and fit it in there with LM78xx regs.
Nice video. So have the potentially dangerous floating voltages been fixed? Will I need to put in a linear supply? Is that what you had to do? I have 39 volts rms coming off the BNC grounds and the very arbitrary signal is disturbing looking spikey garbage - and this is with the power off and the unit connected to mains. Would you know if I'm missing something?
How about some basic signal quality tests?
Wait, is that a 10 megahertz XO sitting on the board next to the FPGA? That would make an external reference input mod very tempting.
if using the small screen is a pain then use the software to control it, you can even create your own waveform shapes too.
Hi Steve, I couldn't deal with the encoder knob. So I 3D printed a new one. I dl the openscad code from thingiverse and modified the code to what I wanted. It's SO much easier now to adjust the generator. I did print it upside down so the shaft hole was facing up for better results.
Lucky you, having 3d printer... I would need to make it from wood....
nice review ! if one were to power it via the 5v in on the rear what would be a suitable input current from the PS used ? wondering is a 2.4 a cell phone charger would be acceptable or even what to choose for current from a bench P.S. unit. I'd be using it only for sine wave 20 - 20,000 khz for audio amp testing purposes... at that frequency the square wave may even look proper but all i need is sine really.
Will this unit do audio modulaiton for audio signal testing?
Thanks for the video.
Can this out put modulated waveforms? Thanks
Thought: Wouldn't it be better to add a series inductor to the (signal-ground to mains-earth) connection?
It would ensure a DC potential between the signal ground and mains earth close to 0V, while letting the EMI suppression safety capacitor carry any high frequency noise
I have been off the air for 35+ years, just started up again and need a few pieces for the bench, not mush reparting anymore, but something to have in case. I was looking at the K moon FY6800 DDS Signal Generator/Counter, For something that may be turned on once a month if that what do you think?
Hello. ....Are you able to do a small video on using the sig gen on say receiver front end allignment etc .....not much on youtube about it ...
Channel 2 just snailed away in the end
Anthropomorphous Dodecahedron I saw it on the screen and wondered, then read your comment just a few seconds later and had to laugh .. 😂
I wish this was available 3 years ago.
The Roll off is smooth from zero to 60Mhz seen logarithmically, it become noticeable in particular above a couple of Mhz and decreases rapidly towards 60Mhz(-12dB down), good quality signal generators would probably use switchable gain amplifiers or amplifies that can handle higher frequencies. Nice toy!, but its no way a serious bit of test equipment.
Can this generator be used as a Dr. Hulda Clark machine will it function the same.
How do I open the case of the FY6900 without damaging the plastic.
On my FY6900 (100MHz version), when I cable one of the signal generator channels over to the integral frequency counter (not shown in this video), it reliably shows the same duty cycle numbers. But when measuring either of the internally generated sine waves, the counter shows a duty cycle if 59.6% or something like that. I have noticed the same thing in some other videos of this model, all of them slower speed versions. I wonder if it is a bug....it does not seem to be due to the sine waves having a DC offset or anything like that........
Nice video. Does it also show half amplitude when connected to a 50 ohms termination like the previous model?
Yes.
@@sdgelectronics is that not correct? It seems to be correct since that would be an impedance match
How does compare to other entry level generators?
The FY6900 has several models that range from 20MHz to 60MHz. Can the 20MHz version be modified to 30MHz or more? Maybe by reprogramming the Altera Cyclone devise?
Thanks for doing this excellent review. I purchased the same 60MHz unit about 3 months ago and have been reasonably happy with using it to drive a set of synchronized PWM waveforms. One question I have is that you were a little bit cryptic when you spoke of how the power supply was non-ideal because its design wasn't compatible with the need to ground the BNC shields. I think it would be interesting and educational to explore this further if you have time and include high level schematics of the way it's currently being done in this unit, and the better way.
I will probably design a new PCB for the Power Supply and cover all of this in a future video :) Thanks.
wonder if they have solved the random bricking of the old 6800. no support means i wont be buying another
Does it allow smooth adjustment of amplitude, frequency and so on? Mine appears to disturb the output for a while whenever I do any adjustment to the waveform parameters.
Hi, I have a FeelTech FY3200S and it does the same. I would like to buy another signal generator that does not make glitches when adjusting the frequency or amplitude. Which signal generator do you have? and did you get an answer to your question?
@@gertgude-hansen2562 Only your answer. Mine is FY8300 10MHz. This glitch is very annoying and makes this generator useless in my experiments with switching power converters processing power while the generator was supposed to smoothly change the reference signals amplitude/freq.
Gee that ribbon soldering was nasty. It seems like just a very minor couple of fixes and it would be a good unit
Does this have decent sweep feature?
Sorry for the stupid question, I am still learning, why the BNC splitter on the oscilloscope and am I mistaken or is it male to 2x female? Thank you very much indeed for the video, I found it very informative, at lease the bits I understood.
Hi. Thanks for the review. It does not make any sense that the 60 MHz version is rated ONLY to 5 Vpp output. If you see the specs table (at minute 01:30) you will notice that those 5 Vpp are for outputs greater than 20 MHz (take a look at the row immediately above of the one you highlighted in yellow) and the outputs at 24 Vpp are available for frequencies lower than 5 Mhz. It looks to me that this is for all models. I guess those 4 amplitude ranges in the table do not belong to each products model (2nd row), but they do belong to the row with the frequency ranges just above the yellow row. Actually you never adjusted the amplitudes in your video above 5V. Tricky chinese specs table!!!. Thanks.
Hi Rodolfo, yes I think you may be correct. Either the GBW of the amplifiers is not high enough or they cannot dissipate enough power. Indeed it does let you set the voltage higher at low frequencies.
Is there anyway to overcome this limitation? like putting the output in series with an external power supply?
@@Adrian_Finn Just use a amplifier, right?
Picked up one of these recently. Was going to build your PSU for it but my FY6900 comes with the v2.1 pcb which only needs a 5v supply.I’m going to try replacing it with a Meanwell 5v SMPS.
Hi. I can't find any other information about this v2.1 revision of the board. Can you elaborate? or post a picture so we can see the changes?
Cheers.
What FW version comes up on your boot screen?
My question re FW was to Stuart...
@@markderlo212 v1.4
Will it work with spooky 2 xm genrator for that info I can pay you.
Jak się spisuje topnik RF800 ? :)
Any plans for a more in-depth assessment. It would be nice know if this model can maintain its stated output levels over its frequency range unlike it's predecessor? Karl
Let me know what specific tests you'd like and I can do them. Thanks
@@sdgelectronics signal purity, output level range and accuracy. General hands on experience of the user interface would be good. I have the earlier model with the 16/2 LCD which is only just a usable instrument. Karl.
@@sdgelectronics software connectivity, firmware updates?
Versions have nothing to do with voltages. Higher frequency ranges limit the max voltage. All FY6900 can do 24Vpp!
Thx for the info
Hi. I'm new to this electronics, I have the fy6800 model and when I set the amplitude to say 5volts my scope is actually showing 5.20 volts. what is the reason for this please.
Welcome to China.
@@RESISTAGE LOL!!! That's EXCELLENT MAN!! LOL!!!!!
bought this, and waiting for the update video....
I'll be getting to work on the new PSU soon. I need to finish the lighting project first :)
@@sdgelectronics Excellent.
thanks for the video. for me 5v output is not enough, so I will certainly go for a 30MHz version instead that offers 20V output. also this poer supply seems very crappy. the former 6800 had a better one !
I think I was mistaken, the output voltage capability is the same, but drops when set to higher frequencies
@@sdgelectronics do you agree with him about the power supply being worst? Thanks
I got a KKMoon branded version of the FY6800 60MHz from Amazon a couple of weeks ago for just £66.49 - absolute bargain. I prefer the FY6800 case to the newer FY6900 - cleaner lines and easier to see markings on the rear panel. It's great value for money considering all it's features and accuracy. Don't forget it's also a frequency meter and counter, and up to 8 units can be sync'ed together. I agree on your comment about the encoder knob. Although it pulls off easily and I can make a bigger one with my 3D printer.
hope yours wont brick it self like all the others
@@MrOrangeman18 - Noooo, I haven't heard about that - do you have any more info?
@@SimonCoates just google it. theres lots on the eev blog forum
@@MrOrangeman18 - wasn't it the FY6600 that had issues?
Simon Coates yea that’s the one.
Can you name in written that chip at 7:13? Plz
So beside the lead from the mains which I agree the cable is too tiny, the rest is overkill for a generator that already meets the needs of hobbyists. I'm not sure what you think these units are supposed to have at price point of $100. Realistically you are getting a lot of function for that money compared to the big boys. Frankly I see no issue with its current power supply whatsoever and any variation would be negligible at best. It's not overheating by any means and that's why there isn't a stock fan.
The output drivers get excessively hot when driving a 50 ohm load which is the main reason for cooling.
The main issue with the power supply is it is not suitable for use in this country and would fail the requirements for the usual UL, CE, TUV certifications. The leakage current is also sufficiently high that it can present a risk to any electronics connected to it.
I added rubber feet on the bottom, now it does not slide around so easily.
lots of issues with this device. Default voltage offsets, distortions when you go above 10V, there are many reported issues
Don't like that power supply at all, shame as the rest of the device is pretty good. I have
a FY 3200 S, and the power supply blew up on me big time. (explosive short on the mains rectifier / capacitor area of the board), not happy!!
Brasil TKou
Hmmm, I'm curious why this blue is line moving away ruclips.net/video/FaNvHQW_CsQ/видео.html Isn't it drive from one frequency source? Or? ... it's strength really.
I added a slight frequency offset on one channel to highlight one specific issue people were having on the predecessor.
It helps if I comment and watch the ads
The color of the protection gear is the same as the body color. Also the back panel misses labels and voltage plate. It looks like an unfinished product.
Labels are stamped into the plastic
Thanks for the review. I have been looking at this product.They sell four versions of it. Seems to me that the only diffrents beetween the 20Mhz version (cheapest) and the 60 Mhz version (most expensive) is the max output freqency of the sinewave ( 60 Mhz instead of 20 Mhz). All other waveforms have the same top frequency output (except square wave is only 15 Mhz on the cheapest 20M type, but 20 Mhz on the other three more expansive types).
What is interesting is that all four version have the same sampling rate of 250 MSa/s. I also do not see any other difference on the spec on the banggood website. As a layman it looks to me that the going over 20 Mhz is of no use with this samling rate. What you are possibly paying for on the more expensive versions ( 30M,50M and 60M) is just unlocking in the firmware, disorted waveforms, that the equipment has no way of displaying correctly. There is only a 14$ price diffrence on the 20M and 60M version. But what are you getting for that money ?
Maybe I am missing something on the spec. Please comment if you think I am wrong on this
It would also have been nice to see what the waveforms look on the max frequency.
Previous model FY6600 the square wave is nearly a sinusoidal at the limit. Sine wave is only slightly distorted at limit. Previous version were also simply firmware limited in freq range.
The output voltage is higher for the lower frequency versions.
≤10MHz: 1mVpp~20Vpp
10MHz to 20MHz: 1mVpp~10Vpp
20MHz and above 1mVpp~5Vpp
@@SimonCoatesI
I am confused. I am not an expert, but Is it not a benefit to be able to get a higher output voltages. Something you would pay more for, not the other way around. Is it possible that the max output voltage decreses with higher freqency on the same version (model type). For example on theFY6800-60M type, the max sinewave voltage on 5Mhz would be 20 vpp, but only 5 Vpp on 25 Mhz frequency. That is how I understand the spec on banggood. But again I am just a layman and would be happy if I am corrected on this.
@@davidandersson4246 - sorry for any confusion. The 60Mhz version will output the higher voltages at lower frequencies - with the amplitude lowered in software at the higher frequencies to limit the power.
User Guide here: en.feeltech.net/index.php?case=archive&act=show&aid=62
Model ......FY6800-20M FY6800-30M FY6800-50M FY6800-60M
Sine 0~20MHz ..... 0~30MHz ..... 0~50MHz ..... 0~60MHz
Square 0~15MHz ..... 0~25MHz ..... 0~25MHz ..... 0~25MHz
Ramp, Triangle 0~10MHz ..... 0~10MHz ..... 0~10MHz ..... 0~10MHz
Pulse 0~10MHz ..... 0~10MHz ..... 0~10MHz ..... 0~10MHz
TTL/CMOS 0~10MHz ..... 0~10MHz ..... 0~10MHz ..... 0~10MHz
Arbitrary Waveform 0~10MHz ....0~10MHz ..... 0~10MHz ..... 0~10MHz
You are correct in thinking there's not much between all versions. I was lucky and got a KKMoon branded FY6800-60M at £66.49 next day delivery.
Why do they insist on using those SMPS supplies in a device that shouldn't have noise coming from the supply???!!! Linear or forget it - deal killer from me.
These are good devices, but the power supplies are terrible, which is a shame.
You are from poland?
No, the UK 👌
@@sdgelectronics j saw polish "topnik rf800" on bench :)
@@Kazik70 I'm a big fan of the TermoPasty brand.
Идеята на това захранване е че хвърля хармоници вероятно до Бога...
Колко щяха да оскъпят изделието ако бяха сложили трансформаторно захранване? Сигурно милярди.
Захранването не е екранирано,спестили филтри,въобще гадна работа...
It is in The name, hrc fuse. But you cant have it all