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JunTek PSG9080 Programmable Signal Generator (80 MHz - 300 MSa/s - 14-bit)

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0culus:

--- Quote from: TurboTom on September 17, 2020, 08:59:12 am ---Thanks @radiolistener for the teardown and the tests. Considering the price, this "Junktek" thing is really disappointing. Cheap as cheap can...

No dedicated sample memory, R-2R discrete D/A converter, (probably) marginal reconstruction filtering and no shielding at all. The power supply , especially the transformer, doesn't look too trustworthy regarding creepage distances, and performance-wise, -40dBc for the second harmonic is really less than stellar!

This generator may be okay-ish for hobby applications, but if I had to spend 170+ EUR plus possibly import VAT/taxes, I'ld rather spend 60 EUR more (all taxes included) and get Rigol's DG811 and hack it. Despite the size and the toy-like appearance, this will get you a much more mature instrument which can be considered to be the entry into the professional segment. Have a look here for a set of teardown photos of my DG811. It becomes directly obvious that this generator plays in a different league.

If you don't want to spend that kind of money, the Feeltech generators are available for about half the money that the Junktek will set you back, and are pretty well characterized on this forum and, as the common opinion goes, are pretty useful as an entry level hobby AWG (with a mod applied or two...).

--- End quote ---

Just looked at some US sellers of this fine instrument...over $200??? This thing is really a piece of junk. Might be worth $50. My recommendation to anyone looking at these is save your money and get an actual good quality signal generator from a reputable brand.

JOHN LEE:
Regarding the function of SYNC, The manufacturer gave me a detailed explanation and took a picture today. I shared it with you. The SYNC function means the phase synchronization of the output signals of multiple machines. For example, when two machines are set to synchronize, when wiring The first machine is connected to SYNC-OUT, and the second machine is connected to SYNC-IN, then 4 signals can be output in phase.

TheDefpom:

--- Quote from: 0culus on September 19, 2020, 05:16:07 am ---
Just looked at some US sellers of this fine instrument...over $200??? This thing is really a piece of junk. Might be worth $50. My recommendation to anyone looking at these is save your money and get an actual good quality signal generator from a reputable brand.

--- End quote ---

What are you basing this revelation on? have you even used one, or seen one in person ?

I have used one, and I like it, it is a LOT better than some of the others I have tried, and for the money I actually think it is pretty good, it isn't just a function generator, or an ARB, but a SIGNAL GENERATOR.

Not everyone can afford a Keysight, or Rohde & Schwarz etc. that is why there are difference classes of instrument to suit different budgets, for the price class this is in it is excellent.

electronx:
I used low-budget quality china products. I have one review here and it continues. https://www.eevblog.com/forum/testgear/tonghui-th1953-5-5-digit-benchtop-multimeter-hands-on-review/

I think tonghui is planning to launch a signal generator soon and I think it will launch a quality product for a low budget. and I will most likely buy it. It feels like it won't break even if I hit it with a hammer.
Obviously juntek  signal generator did not meet my expectations. Feelec -juntek and low-budget instruments like this are better than nothing. But when I contact the companies ,I see that they are only focused on making money. There is the idea that "if we make 100 dollars from everyone we'll get rich." Fpga s are expensive and I think that's the most money on this device. I think they make more than $ 100 for each product. Of course not everyone can buy rohde schwarz and keysight, but as I said there are much better china products.

electronx:




voltage is very fluctuating. And when set to 15 volts, it appears 14.14 volts. The margin of error claimed by the manufacturer is 0.01 volts.
there is actually 6.08% margin of error. I measured without load, I can't imagine when I add load. :palm:
Of course, it is not good to calculate the percentage error for a value. However, even if I measure a lot and make average errors, the device does not meet the catalog values. It is clear that it cannot see 15 volts

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