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Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see!
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IanJ:
Great thread.......now my HDG2002B thinks it's a HDG2102C......well untested as yet, but I can go up to 100MHz on the menu instead of 5MHz.

Must admit, I'm new to linux command line but a wee bit of googling and I found how to use the vi command and the jobs a good un'.

Ian.
Control:Eng:
Time for a small conclusion:

Status Quo:

Unmodified HDG2002B

After playing 2 hours with it I can say that the waveforms seem to be good and within the specification (at least regarding rise time and overshoot).

Until now, I didn't manage to create a waveform within the internal Editor of the device. I already got 3 bluescreens and many times it didn't react to inputs...A software update could be useful :)

Nevertheless, you get much for your money...250MSa/s, 16 Bit and a big memory.
idpromnut:

--- Quote from: leppie on May 16, 2014, 05:17:38 pm ---
--- Quote from: idpromnut on May 16, 2014, 04:52:08 pm ---So after updating my HDG2002, I ran a few tests on the various function types at the maximum settings. I will provide a better writeup later, but essentially the triangle, square and pulse modes degrade rapidly in both signal shape and strength as the frequency increases past 10MHz. The sine output is great up to about 95MHz.

--- End quote ---

What amplitude did you use? I recall seeing it says only 2Vpp for maximum (not sure what waveform that was though).

--- End quote ---

1Vpp to stay well within their specs.
nctnico:

--- Quote from: idpromnut on May 16, 2014, 04:52:08 pm ---So after updating my HDG2002, I ran a few tests on the various function types at the maximum settings. I will provide a better writeup later, but essentially the triangle, square and pulse modes degrade rapidly in both signal shape and strength as the frequency increases past 10MHz. The sine output is great up to about 95MHz.

--- End quote ---

The output filter probably has a sharp roll-off. With a bandwidth of 100MHz a square wave of 30MHz won't look much like a square wave since only the 60MHzand 90MHz harmonics get through the filter. Still 100MHz bandwidth is pretty useful.
Mark_O:

--- Quote from: nctnico on May 16, 2014, 11:23:51 pm ---The output filter probably has a sharp roll-off.
--- End quote ---

Nico, what would make you think so?


--- Quote ---With a bandwidth of 100MHz a square wave of 30MHz won't look much like a square wave since only the 60MHzand 90MHz harmonics get through the filter.

--- End quote ---

True, IF it had only a 100 MHz BW.  However, if you look at the specs you'll see it claims it can do 40 MHz square waves, and 30 MHz pulses, and that's simply not possible with a 100 MHz BW.

Hmm, those are the new limits, according to the OP, but Hanteks specs are quite different, even for the 100 MHz size models... basically an anemic 4 or 5 MHz for everything except sine and arb. 

But that doesn't make any sense, because arb is rated to 30 MHz, with a 6ns rise-time.  And the duty cycle of square waves is rated at 40-60% at "10-40 MHz", and 50% beyond 40 MHz?  And Pulse periods are rated down to 33.3 ns (i.e., 30 MHz).  So I'd say the "4-5 MHz" part of the spec chart is incorrect, and the OP has got it right.

To achieve those results would mean the output filter would be out somewhere around 400 MHz, not 100 MHz.
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