I did a few tests with my new Hantek. Of course the model is no longer brand new, but perhaps there have been improvements compared to previous versions?
There were complaints about the noise level.
I can't find anything special about mine.
At 5mV/div I see almost no noise and at 2mv/div I can see that it is alive.
For me it is not a "show-stopper". (See attached image noise5mV.png, noise2mV.png)
The cheap device doesn't fail even at frequencies that are much higher than the bandwidth.
It jitters and fluctuates and the amplitude drops, but it doesn't show any "fantasy frequencies".
See 200Mhz, 250Mhz from TinySA. (attached image 200Mhz.png, 250Mhz.png)
That's impressive!
I also found most of the measurements OK for an oscilloscope.
I have the following results with the tools at my disposal.
1kHz Square Wave:
5V -> 4.96Vpp
2V -> 2.08Vpp
1V -> 1.04Vpp
500mV -> 504mVpp
100mV -> 104mVpp
50mV -> 52mVpp
40mV -> 39mVpp
10mV -> 10mVpp
5mV -> 4.96mVpp (See attached Image 5mV.png, that's with 50Ohm Load Resistor, so half of it)
Signal from Si5351A with descending frequencies. Because the amplitude is not adjustable, I used a 20dB attenuator.
162MHz -> 610mVpp
100MHz -> 620mVpp
80MHz 560mVpp
50MHz -> 570mVpp
30MHz -> 540mVpp
10MHz -> 538mVpp
1MHz -> 516mVpp
The signal of course goes from square wave to sine wave above 50Mhz, but the measurements don't seem shockingly deviating to me.
What I really don't understand is the amplitude measurement with heavy ripple/overshoot.
Actually the Si5351A should output 3.3 volts amplitude.
The measurement with the Hantek shows a heavy overshoot (See attached image VAmp.png)
I don't think that's a problem per-se, but the amplitude (Vamp) should be much lower than the Vpp?
Visually it's correct too, but the specified measurement value (Vamp) isn't correct?
If you subtract 1.2 volts, it would be better, right?
Strangely enough, my even cheaper Zeeweii seems closer to reality. The attached Image shows exactly the same input signal.
(See zeeweii.png)
Is it a (another) bug?