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Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see!
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Daruosha:
I’m not sure if anyone is interested in this AWG, however let’s try my chances and see if someone would help me:

I bought HDG2012B model and using a “upk” file which I have found in this thread, changed the model name to HDG2102C (didn’t try the serial connection) and the frequency limit had raised up tp 100MHz, afterward using another excel VBA script (provided in this thread again), calibrated the AWG against my DS1054z (up-hacked) and Rigol DM3058E.  Once the calibration finished , I connected the output 1 of the AWG to the scope  (50-ohm terminated) and tried to check the sin output at  100MHz. It looks distorted and jittery. Since I purchased a Rigol DG4102, I never bothered to fix the issue or even cross check with other similar units. Now I need a second AWG in my lab, so I wondered it worth a shot to have a second look and try to fix the issue. I’ll post a few screenshot.

My PCB version is 1006 and I’m running the latest firmware published by Hantek.

Anyone have any ideas? Is my device defected or the new PCB versions don’t meet 100MHz spec in lower models? The output seems clean enough upto 50MHz. I can post some screenshot of the output on my spectrum analyzer if you need more details. but more or less it’s similar to the FFT screenshot from DS1054z (100MHz center frequency with 50MHz/div, other screenshots seems self-explantory enough i guess) .
fremen67:

--- Quote from: Daruosha on April 06, 2018, 06:44:18 pm ---I’m not sure if anyone is interested in this AWG, however let’s try my chances and see if someone would help me:

I bought HDG2012B model and using a “upk” file which I have found in this thread, changed the model name to HDG2102C (didn’t try the serial connection) and the frequency limit had raised up tp 100MHz, afterward using another excel VBA script (provided in this thread again), calibrated the AWG against my DS1054z (up-hacked) and Rigol DM3058E.  Once the calibration finished , I connected the output 1 of the AWG to the scope  (50-ohm terminated) and tried to check the sin output at  100MHz. It looks distorted and jittery. Since I purchased a Rigol DG4102, I never bothered to fix the issue or even cross check with other similar units. Now I need a second AWG in my lab, so I wondered it worth a shot to have a second look and try to fix the issue. I’ll post a few screenshot.

My PCB version is 1006 and I’m running the latest firmware published by Hantek.

Anyone have any ideas? Is my device defected or the new PCB versions don’t meet 100MHz spec in lower models? The output seems clean enough upto 50MHz. I can post some screenshot of the output on my spectrum analyzer if you need more details. but more or less it’s similar to the FFT screenshot from DS1054z (100MHz center frequency with 50MHz/div, other screenshots seems self-explantory enough i guess) .

--- End quote ---
The sampling rate of this model is 250MSample/s, that is an average of 2.5 samples @ 100Mhz so it can' be stable.
It is reasonnable to go up to 62.5 Mhz where you would have 4 samples/cycle. After that, this is useless.

So the good news is that your model works fine  :)
Daruosha:
I assume the good news would be that there's a problem so I can fix it. How can Hantek sell a 100MHz arb gen with crappy looking sin output? if you take a look at the FFT screen shot, there are rather strong 25MHz combined into the 100MHz output. At the fist i though there's a problem at the output filtering stage, but if everybody has the same problem, what's the point of up-hacking an arb-gen to produce useless outputs?
Berni:
There is a reason why this signal generator is so cheap.

It happens on all frequencies that are not a integer multiple of 250MHz due to how DDS synthesis works. If you want a ARB generator that can produce clean sine waves to 100MHz be prepared to pay 4x the price of this. The more expensive gear usually has a higher sample rate and the proper ones can adjust the sample rate with high resolution to always match a integer multiple of the output to eliminate this distortion.

I bought a Tektronix AWG2041 to get good high speed generation.
fremen67:

--- Quote from: Daruosha on April 07, 2018, 01:01:23 pm ---How can Hantek sell a 100MHz arb gen with crappy looking sin output? if you take a look at the FFT screen shot, there are rather strong 25MHz combined into the 100MHz output.

--- End quote ---
Explain to Hantek that you are not happy because you bought a 12MHz AWG that can't work at 100MHz.
The only fact I can see is the quality of the software. Otherwise you get what you paid for.


--- Quote from: Daruosha on April 07, 2018, 01:01:23 pm ---what's the point of up-hacking an arb-gen to produce useless outputs?

--- End quote ---
I think there is room between 12MHz and 100MHz.
The problem is related to the technology it is using.. and at 250Msamples/s there are no miracles. If you need steady 100MHz output, buy something else.
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