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Hantek 2000 series - 2C42/2C72/2D42/2D72

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NRoach44:
I'm in the same boat as Smajdalf - I just got one from a local(!) store that sells them and it looks like I got a 2020/21 revision board.

All of the components needed for the mod are already there - the DAC, op-amp and supporting passives.

I wonder if it's just a case of checking what resistance R65 is.

rhb:
I just got a 2D42.  I have one of Leo Bodnar's <40 ps rise time pulsers and it shows a good step with a <5 ns rise time.  So it really *is* a 70 MHz DSO :-)

The FW is rather underwhelming, but  it should serve OK.

Mine also arrived with a dead battery.  We'll see if it takes a charge and holds it.

Reg

rhb:
Quick followup.

I've been messing about with an 8560A as a receiver and a tinySA and Leo's pulser as sources.

The basic HW is fantastic.  The FW, mehh.  For analog circuit work it's usable to 200 MHz.  It's severely aliased above 62.5 MHz, so make sure you understand that.  But it does a good job.  It will let you trace an LO circuit looking for a failed part.

I'm now attempting to estimate phase noise of the Hantek AWG clock using the 8560A.

Just finished averaging 100 traces.  At 10 Hz RBW the phase noise is -55dBc.

For my purposes, a portable HF capable test bench, the 2D42 is excellent and only needs a jailbreak.

Have Fun!
Reg

gf:
It is nice gadget, and somehow I still like it (particular due to partability and battery operation), but calling it "excellent" is IMO exaggerated.
Features are just elementary, but yes, it does display waveforms sufficiently for a number of simple use cases.
Frontend bandwidth is ideed more than sufficient. Below is a list of things I do not like so much:

* UI experience is rather inconvenient. I'd also favor a touchscreen. Operating a NanoVNA or TinySA is much more pleasant.
* Data transfer to the PC app, and consequently the screen update in the PC app, is horribly slow.
* Frontent is a pretty noisy, in all V/div ranges. No wonder, though, given that all input ranges are attenuated to 10mV/div first, and then get re-amplifed.
* A range smaller than 10mV/div were nice, too. But I'm unsure whether it would make sense, given the noisiness.
* There is almost no memory depth.
* The lack of memory also prevents a trace averaging feature in order to reduce noise.
* Input capacitance changes, depending on the input attenuator relay position (1:1 vs 50:1). This impacts adjustment of 10:1 probes. But the same seems to apply to various other low-cost scopes, too.
* There is a significant feed-through from the AWG under load (i.e. when a load is connected to the AWG) to the scope frontend. Maximum feed-through happens at ~5kHz. 1)
I did track the path, and obviously it happens via the negative power supply rail. The rail is shared between AWG and scope frontend, and the PSRR of the frontend is obviously not very good - just roughly 10dB, IIRC.
* In two-channel mode, the two channels are not sampled simultaneously, but with a time offset of 1/2 ADC clock cycle (which depends on selected time base). 2)
I.e. if you feed the same signal into both channels, you oberve a phase difference, which is not present at the inputs. Also well visible in x-y mode, when an expected straight line turns into an ellipse.
* The AWG cannot reach the full specified output voltage swing w/o clipping (at least under load). Root cause is that the negative supply voltage for the output opamp is too low (and the opamp is not rail-to-rail either).
* When I got mine, the AWG did produce significant spikes in the waveform. This was IMO a timing error in the FPGA (DAC's setup times from data to clock edge not met).
A FPGA update from hantek fixed it mostly, but I still see sporadic fringes in the waveform -- it still does not look as clean as from other AWGs.
* The AWG does of course not have any analog attenuators, so the output amplitude is only controlled digitally (-> the lower the amplitude, the lower the relative resolution).
1) See first attached image. AWG generates a 5.5kHz signal, and drives a 50 Ohm load. Scope inputs are shorted with 50 Ohm terminators (in order not to pick-up noise).
    Still the scope channels display the fed-through signal fom the AWG (with an aplitude equivalent to a 500mVpp input signal, at 500mV/div) :(

2) The next three images demonstrate the 1/2 ADC clock cycle time offset between the two channels.

rhb:
Most of the shortcomings are the horrible software.  There is no way to adjust the trigger level!

I've ordered the Owon version of this and shall keep the better of the two.

Still for a scope to troubleshoot a radio it will serve just fine which is what I want it for as part of a portable RF bench with nanoVNA, tinySA, LCR/transistor tester, diode noise source, etc.

It's obviously not a replacement for a Rigol DS1000.  Just a lot smaller.

Have Fun!
Reg

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