Products > Test Equipment
FeelTech/FeelElec FY8300S Quick Tear Down
nctnico:
Those square waves look OK. What happens if you use pulse generation mode (if available)?
CDaniel:
Square wave looks ok , but turn slowly the frequency to see if some "odd" values have jitter
If is jitter free inded it is abig step forward
rf-loop:
--- Quote from: FeelElec on January 17, 2020, 09:17:15 am ---Dear customer, we are very apologize for the trouble and thanks for your suggestion. We could accept your suggestion and replace the screws. If there is any problem with the product, please feel free to contact us.
Email: service@feelelec.com
FeelElec
--- End quote ---
It is bit confusing. There reads FeelTech FY8300S
You are FeelElec and talk like you are from this company who make these.
FeelTech in China in Henan Province do not know this FY8300S at all in their own web sides ( http://en.feeltech.net/ ) (sidenote, fun that company do not use even https ). There can not find at all find this 8300S model. I wonder how many copycats there (here) in China is for these... taobao etc is full of these or lookslikes fhat print front panel labels as Feeltech or Feelelec because we live in a culture of imitation.
ETA: But downloads section there can find FY8300S manual and other materials.
So who/what is FeelElec and what is FeelTech who is original (or are they same) manufacturer for example FY6900 and then their webside in 6900 front panel read FeelElec. What is this "guess who..." game for.
How about your products CCC. You do not care C E or UL or TUV or what ever but looks like you do not care even CCC. Who we hang after first bad happen with these electrical shits even if low voltage electronics parts are not so bad in price.
China Compulsory Certification (CCC). The CCC certificate was introduced in 2002 and applies to imported goods as well as to Chinese products. Why this information is missing everywhere where FeelTech or FeelElec who ever these are are giving informations about their products. Is it so that you think about these things...so what...who cares. Later you may find that also in China you can not anymore do how ever just because sky is high and caesar is far away.
Is it so that that your products do not meet even domestic standards what is today nearly like mandatory in China afaik and you need do sales so that no one is responsible, just like P2P makets. How you round over China Customs (yes I know it is still today quite easy but later more and more difficult after (noname) is fully integrated inside.
Some nice similarities with European Union C E...
"Failure to comply with CCC regulations will lead to goods being detained at the border or returned to the sender. Likewise, improper use of CCC licenses or printing a CCC-mark on products without certification will also result in fines and penalties."
And
"The two most important elements of China Compulsory Certification (CCC) certification are product testing (products that are to be certified are sent to test laboratories in China) and factory audits (inspection of the product manufacturers by Chinese auditors). Once a certification is granted, it is valid for several years but must be maintained through annual follow-up audits."
Now, please show these products CCC and documents about audit. And so that all your products are traceable to it. I think it is simple because of course you have these.
also it is good take seriously one previous message: //Posted by: rhb, on: January 16, 2020, 11:39:50 am//
rf-loop:
--- Quote from: grizewald on January 18, 2020, 12:48:29 am ---My mistake.
Here's a 9.32566MHz square wave. Triggering on the leading edge with persistence set to 10 seconds.
I'd be getting a thick trailing edge if there was jitter wouldn't i?
--- End quote ---
This do not look bad at all.
Normal way to measure jitter is measure pulse to pulse, (period to period) jitter. It can do with scope what have low trigger jitter. Trig to rising edge but watch next rising edge. Also good to check example jitter inside period, example trig to rising edge and watch falling edge.
In data sheets jitter is typically pulse to pulse or period to period jitter. Mostly these are today told using jitter rms. But true circuit is many times critical for peak to peak jitter. Of course manufacturers like write rms jitter because this number is more nice looking. It is very near zero rms jitter if generator generate million pulse 50ns period pulses with zero jitter and then one period is 70ns. Nice but our some test setup may fail totally even when our generator have very low, nearly zero p-p time jitter rms number. p-p jitter is very important in many cases. Long persistence with good trigger setup tell it after wanted time period. I have long time cricised companies, independent of brand class about these informations. System math produced time jitter need tell peak to peak specially because it is not at all random distribution and system designer naturally know it exactly and then can tell rms for sales advertisements if like.
nctnico:
Well... I don't think you have to expect stellar jitter performance from such a low cost generator so I really wouldn't bother measuring it extremely precise. The square waves are likely made using a sine wave to square wave converter (comparator) which may have issues at really low frequencies because the rise/fall times of the sine wave becomes to slow.
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