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

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Andreax1985:
I just got a FY6800 60Mhz and I observe, right off the bat, that:

i) Maximum output amplitude of 20V pk-pk for the sine wave is attained only up to around 3Mhz. After that, maximum amplitude is gradually attenuated (12V pk-pk at 10Mhz, 5V pk-pk at 20Mhz, 2V pk-pk at 30Mhz). It seems way out of specs (20V pk-pk up to 10Mhz, 10V pk-pk up to 20Mhz and 5 Vpk-pk after 20Mhz).

ii) At lower amplitides there is a noticeable offset: for example at 1Mhz, 100mV pk-pk I measure a 20mV vertical offset.

Is all this to be expected or did I get a lemon?

CDaniel:
Amplitude attenuation is not normal , but 20Vpp is only available below 20MHz , after that 5Vpp is the maximum allowed .
Maybe you did some simple mistakes in your measurement , like using 20MHz bandwidth limit in your oscillocope ...

The offset can be an issue ... it is possible to be adjusted and calibrated from the pots inside if you read this thread , but is somewhat laborious.

Andreax1985:

--- Quote from: CDaniel on February 10, 2019, 05:46:23 pm ---Amplitude attenuation is not normal , but 20Vpp is available only below 20MHz , after that 5Vpp is the maximum allowed .
Maybe you did some simple mistakes in your measurement , like using 20MHz bandwidth limit in your oscillocope ...

The offset can be an issue ... it is possible to be adjusted and calibrated from the pots inside if you read this thread , but is somewhat laborious.

--- End quote ---

I guess I'd better return the damn thing...man...everytime I try to save some money I end up with some crap giving me endless headaches and making me regret not having spent more

Andreax1985:
 Could the problem lie in the fact that my scope doesn't have 50ohm termination, and I'm using the regular 1Mohm input?

Noy:
No, with 50Ohm its only 10Vpp. With high impedance 20Vpp...

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