Products > Test Equipment
FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
StillTrying:
--- Quote from: Jacon on June 08, 2019, 07:55:36 am ---Seems to be new, slightly updated version (new case with back cooler):
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00'010.000'000'000KHz
It looks like the 10kHz is very accurate, +/- 0.1ppb. :)
Cliff Matthews:
--- Quote from: Johnny B Good on June 10, 2019, 02:53:15 pm ---
--- Quote from: beanflying on June 09, 2019, 11:15:14 am ---You are assuming the big fat Earth pin is connected inside the box :-DD :horse:
--- End quote ---
Has anyone managed to get hold of an FY6900 to check this out yet?
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AFAIK, they're still only pre-booking orders.
bdunham7:
--- Quote from: GerryR on June 10, 2019, 02:59:27 pm ---Hello, new here to this forum. I had just purchased an FY6800-60M and ended up returning it. The DC offset was over 35mV when set to 0. There was a lot of jitter in frequencies above 20 MHz or so. Amplitudes were way off into a 50 ohm load; there was considerable distortion in the output into a 10 k load. Square waves started to look more and more like sine waves as frequencies got past 15 MHz. Etc. Etc. Etc. I haven't read all the posts in this thread yet, so I don't know if any of these problems have been experienced by others, but I am curious to know what others have found in actual use, i.e. tied to a real circuit and not just an o'scope. Any input will be appreciated.
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I think your issues are a combination of mediocre quality and unreasonable expectations on your part! I don't know about the DC offset thing, my FY6600 is about 500uV offset so 35mV seems like a lot. The amplitude into 50 ohms will be lower than the front panel setting by about 1/2. I can't address the HF jitter, mine is the 15MHz version. The device has an output bandwidth of about 75MHz and at 250MSa/s, 100MHz would be the absolute ceiling anyway--therefore a 15MHz sine wave is only going to have the 3rd and 5th harmonics and that will look pretty rounded. I realize that the settings allow you to select "square wave" up to 25MHz, but realistically 10MHz is about all these will put out that even resembles a square. This is not a defect, simply a characteristic of a device with bandwidth limitations.
Yes, we've all had these issues and more. However, I doubt you can find a better product at this price point.
GerryR:
bdunham7, thanks for your input. I'm coming from a background where I have been using very high quality equipment, HP, Fluke Keithley, etc. so having to do a lot of fiddling to use an instrument is rather frustrating for me. I don't think I was expecting too much after reading the specs of the instrument, but when you go back to the specs, you see that they left out some important info, like the output load for the specs given. There is no "jitter" (edge, period) spec at all. My fault for not looking a little deeper before purchasing. I do agree that it is a lot of generator for the money, if you don't mind the fiddling, and from what I've seen, they would be better off just selling them as 20 MHz function generators with "some useful outputs to 60 MHz.
Johnny B Good:
--- Quote from: Jacon on June 09, 2019, 07:41:35 am ---
--- Quote from: wasyoungonce on June 09, 2019, 05:24:56 am ---Thanks tried to get manual but it’s not uploaded yet
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This link:
http://myosuploads3.banggood.com/products/20190606/20190606070659FY6900SeriesUsersManualV1.0.doc
worked perfectly for me, yesterday & today.
It's a MS Word docu, titled:
FY6900 Series Fully Numerical Control
Dual Channel Function/Arbitrary Waveform Generator
User’s Manual
Rev1.0 May,2019
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Thanks for posting the link. I've just downloaded and added it to my FY6600 folder for reference and having read through it I'm not particularly impressed. That increase to a 24Vpp only covers the frequency range DC to 5MHz. It would seem to be a "One Upmanship" exercise against the big players who are quite happy to regard the 20Vpp limit as the accepted "Industry Standard" (if you need more voltage amplitude, just add a linear amp).
However, I did notice a downgrade of the 20Vpp limit over the range of 0 to 20MHz that applied with the FY6600 (and the FY6800 istr) to just 10Vpp from 10 to 20MHz. The FY6900 now adds the range 5 to 10MHz where the 24Vpp is reduced to 20Vpp before reducing the pp limit to 10V from 10 to 20MHz. It's quite obvious that this is their way to eliminate the gross distortion of their vast stock of THS3002i ICs they're still trying to use up. >:( Since these limits are burnt into their proprietary firmware, this means you're going to see even less benefit out of an opamp upgrade to a pair of THS 3001/3095/3491s than was the case with the FY6600 and FY6800 models. >:(
I also noticed in their specifications a claim of less than 5 watts consumption which, imho, is an outright lie. I rather doubt they've managed to reduce the power consumption from the more typical 7 or 8 watts with the silicon upgrade required to achieve this reduction. Although a much improved smpsu board might gain some reduction, it's hard to see how they could trim off two watts worth on a 10W rated smpsu with the typical 80% efficiency rating for full load without raising the efficiency to 99%! ::) This all seems extremely unlikely when you consider that their implementation of the power saving standby mode still consumes some 5 to 6 watts (a saving, afaicr, of only 1 watt or so at best).
TBH, I think the FY6800 is the best OOTB product between the 6600 and this 6900 abomination. If they were to open source the firmware (unlikely in the extreme imo) or a keen enthusiast writes a replacement firmware (also unlikely but a more realistic scenario), this still leaves it lagging behind the performance of a fully modified FY6600/6800 even after it too has been fully modified.
If I ever fancied getting my hands on another Chinese Cheepy, I'd choose the FY6800 since it's essentially an FY6600 with better front panel controls and the bulk of the earthed mains socket upgrade already completed (just needs some remedial work with a 10KR 'static drain' resistor and the damage to the ribbon cable making good).
To my mind, after reading through the manual, this new FY6900 just looks like a downgraded version of its predecessors.
JBG
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