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FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator

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GerryR:
Personally, I didn't think that the 6800 that I had purchased wasn't worth much past 20-to-25 MHz (As mentioned above, I ended up returning it.).  I found a descent BK Precision 4045B (20 MHz unit) on ebay for a few dollars more than the 6800.  It doesn't have all features claimed by the 6800, but what it does have works!  I must admit that I am a little bit funny about my test equipment; if something doesn't perform to the mfg's spec, I lose confidence in the whole instrument.  It's OK to make a hobby project out of an instrument, but .....
I had an HP34401A multimeter that I paid $1100.00 for about 18 years ago.  While working on a project, I found that it couldn't measure the DC offset of a sine wave.  My cheapo hand-held meters could make the measurement, but this fancy piece of gear couldn't!  The people at HP (now Keysight) said it was a "quirk" that I ran into, and I should just trade it in on something newer.  Lost all trust in the meter...Up for sale!

bdunham7:

--- Quote from: Andbro on June 12, 2019, 11:39:06 am ---Hi,

If the 6600 to 6900 are not good. Do you have any suggestions???

Thanks

--- End quote ---

I think the best choices are:

A.  Buy a 6600 and use it in the grounded configuration and don't expect more than 10Vp-p output.

B.  Buy a 6600 and modify it if you absolutely need floating configuration.

C.  Spend a LOT more money and maybe get something that really isn't any better.

These are not precision function or pulse generators or low distortion audio signal generators, they are versatile and useful Arbitrary Waveform Generators.  They are very handy for a wide variety of things.  There may be a few bugs, quirks, anomalies or shortcomings, but I've seen equipment that costs 1000X as much have just as many issues.

bdunham7:

--- Quote from: GerryR on June 12, 2019, 05:55:15 pm ---Personally, I didn't think that the 6800 that I had purchased wasn't worth much past 20-to-25 MHz (As mentioned above, I ended up returning it.).  I found a descent BK Precision 4045B (20 MHz unit) on ebay for a few dollars more than the 6800.  It doesn't have all features claimed by the 6800, but what it does have works!  I must admit that I am a little bit funny about my test equipment; if something doesn't perform to the mfg's spec, I lose confidence in the whole instrument.  It's OK to make a hobby project out of an instrument, but .....
I had an HP34401A multimeter that I paid $1100.00 for about 18 years ago.  While working on a project, I found that it couldn't measure the DC offset of a sine wave.  My cheapo hand-held meters could make the measurement, but this fancy piece of gear couldn't!  The people at HP (now Keysight) said it was a "quirk" that I ran into, and I should just trade it in on something newer.  Lost all trust in the meter...Up for sale!

--- End quote ---

I saw the 4045Bs on eBay, that is a lot off the new price for a 'current' unit.  But how does the square wave actually look??  They list a 20ns rise time, which is more than 3x worse than the FY6600.

GerryR:

--- Quote from: bdunham7 on June 12, 2019, 06:55:09 pm ---
I saw the 4045Bs on eBay, that is a lot off the new price for a 'current' unit.  But how does the square wave actually look??  They list a 20ns rise time, which is more than 3x worse than the FY6600.

--- End quote ---

My Rigol DS1102D shows the rise and fall times to be about 13 ns;  Square wave looks good to about 15MHz and gets very "siney" after that, though rise and fall times remain around 13 ns out to 20 MHz.  The 6800 square wave got  looking like a sine wave around 15 MHz, as well.  Everything I've checked on the 4045B, so far, is dead on.  Good price from one seller on ebay ($124.95 shipped) and the unit I received looks new.

bdunham7:

--- Quote from: GerryR on June 12, 2019, 08:26:29 pm ---
My Rigol DS1102D shows the rise and fall times to be about 13 ns;  Square wave looks good to about 15MHz and gets very "siney" after that, though rise and fall times remain around 13 ns out to 20 MHz.  The 6800 square wave got  looking like a sine wave around 15 MHz, as well.  Everything I've checked on the 4045B, so far, is dead on.  Good price from one seller on ebay ($124.95 shipped) and the unit I received looks new.

--- End quote ---

My FY6600 gives me 8 ns or so and still looks pretty square.  Perhaps your FY6800 underperformed--or how did you connect it?  I have a 50cm RG316/BNC cable direct from AWG to DSO.

However, there is a jitter issue with high frequency square waves with a period that is not a multiple of 4 ns!  See second photo.  I think this is just an unavoidable result of a 250 MSa/s DDS.  If you need a precise, low jitter square wave, this limitation would be significant.

Does the BK unit appear to not have this issue?  It only has 50 MSa/s, so if it can produce a reasonable 9.999999 MHz square wave, then is must not be using the DDS for the basic sine/square/triangle/ramp functions.   

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