Products > Test Equipment
FeelTech/FeelElec FY8300S Quick Tear Down
nctnico:
--- Quote from: grizewald on January 16, 2020, 11:57:59 am ---
--- Quote from: nctnico on January 16, 2020, 06:49:03 am ---
--- Quote from: don.r on January 15, 2020, 05:17:50 pm ---Doesn't appear to be a huge improvement over the 6900 given the price difference. Mods will still have to be done to make it safe as well.
--- End quote ---
Well, there aren't any safety issues from a technical point of view. The mains wiring is rated for mains voltage use and the creepage / clearances are OK too.
--- End quote ---
Using a wire with low voltage DC insulation to link ground to protective earth while at the same time allowing that wire to come into contact with the switched mode power supply's HV components is a significant and genuine safety problem.
--- End quote ---
But it isn't. Look more carefully at teardown videos of other devices and you can see the wire used for the ground has a 300V rating.
--- Quote ---I can't imagine having directly soldered mains wiring with no strain relief being allowed either.
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It seems the wires are soldered through the holes of the inlet. AFAIK there is no requirement to have strain reliefs on internal wiring. I agree it would be nicer to have a piece of heatshrink over the pars with mains voltages but OTOH it makes it difficult to inspect the solder joints.
grizewald:
--- Quote from: nctnico on January 16, 2020, 01:51:24 pm ---But it isn't. Look more carefully at teardown videos of other devices and you can see the wire used for the ground has a 300V rating.
--- End quote ---
My mistake. Looking closely at the wire which goes to the earth, it does indeed have a 300V rating. But that's less than it should have to be safe against the rectified mains voltage which is present in parts of the switched mode supply.
I'll still be reworking mine to make the wiring acceptable to my criteria.
CDaniel:
And after teardown , can you check the jitter for square wave ? One of the issues with FY6600 ... if this is resolved than is not just an expensive toy and could worth the money
Power supply and other deficiences can be corrected , but sloppy firmware not .
ArthurDent:
--- Quote from: grizewald on January 15, 2020, 03:10:18 pm ---
Here's the main PCB:
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One thing I noticed was that the oscillator has been changed from the 50Mhz one used in the FY6X00 models to the common 10Mhz, making it much easier to modify it from using the crappy little oscillator to a much higher stability OCXO.
don.r:
Now THAT'S an improvement I can admire. :-+
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