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

[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

[gf]

Trigger level can be adjusted with the up/down buttons, after pressing the "Trig" button in order to enter the trigger menu.

[philippe_44]

I have a 2D72 and it's a convenient tool but I really don't like the display, it's too small. I opened it and realized that it's a 2.8" mainly due to what seems to me like a bad PCB design with a highly recessed USB-C connector. Still, I was able to design a new front cover and fit a 3.2" display as there is a fully compatible IL9341 one. The original scope is untouched, existing parts are reused with no modification, I'd say the hardest part is to cut the plexiglass cover , all the rest should snap-in just right

You can find details here https://www.thingiverse.com/thing:4920864

[rhb]

FWIW I got an Owon HDS272S.  Night and day better.

I'm returning the Hantek though not yet sure how.

I also got a Fnirsi 1013D tablet DSO,  So far it appears to be a nice solid 30 MHz DSO which simply needs good software.  I bought it in hopes I can find time to make some small contribution to cracking it open.

No one knows how a tablet DSO should work.  The 1013D is a good test bed.

Have Fun!
Reg

[philippe_44]

FWIW I got an Owon HDS272S.  Night and day better.

I'm returning the Hantek though not yet sure how.

I also got a Fnirsi 1013D tablet DSO,  So far it appears to be a nice solid 30 MHz DSO which simply needs good software.  I bought it in hopes I can find time to make some small contribution to cracking it open.

No one knows how a tablet DSO should work.  The 1013D is a good test bed.

Have Fun!
Reg

I've tried the Owon as well - I agree it's better from most point of view and that's also what pushed me to at least change the screen as the HDS272 is 3.5 and that's much more comfortable.

[Madri]

Hello, please, I have damaged the 2c42 tester by measuring in alternating voltage when I had it in ohms. I have changed the resistors R14 and R15 that were burned but it remains the same. I have measured voltages in the area that I indicate in the photo and where there should be 5 volts there are 4.94 volts which seems to be fine but where there is -5 volts I have measured -3.4 volts. And the third measurement is 3.3 volts and the measurement it gave is 2.9 volts. I have also noticed that there is an integrated LTRA that heats up more than normal next to these measurements but I cannot find a datasheet.
I put photos

[tautech]

Hola por favor he averiado el tester 2c42 midiendo en tension alterna cuando lo tenia en ohmios. He cambiado las resistencias R14 y R15 que estaban quemadas pero sigue igual. He medido tensiones en la zona que indico en la foto y donde debería de haber 5 voltios hay 4,94 votios que parece estar bien pero donde hay -5 voltios he medido -3,4 voltios. Y la tercera medida es de 3,3 voltios y la medida que daba es de 2,9 voltios. También me he dado cuenta que hay un integrado LTRA que se calienta mas de lo normal al lado de estas medidas pero no encuentro datasheet.
Pongo fotos

Welcome to the forum.

English only please.

[Madri]

OK thank you

[.rpv]

Hello, please, I have damaged the 2c42 tester by measuring in alternating voltage when I had it in ohms. I have changed the resistors R14 and R15 that were burned but it remains the same. I have measured voltages in the area that I indicate in the photo and where there should be 5 volts there are 4.94 volts which seems to be fine but where there is -5 volts I have measured -3.4 volts. And the third measurement is 3.3 volts and the measurement it gave is 2.9 volts. I have also noticed that there is an integrated LTRA that heats up more than normal next to these measurements but I cannot find a datasheet.
I put photos

Hi.

LTRA seems to be LT1931:

https://www.analog.com/media/en/technical-documentation/data-sheets/1931fa.pdf

But for what you said, this IC seems to be working just being overloaded, something else could be damaged an taking a lot more current that the IC can provide (or its components). R14/R15 are just to close to U4, your meter is it working and just giving bad readings?, if isn't responding at all U4 probably it's gone.

[Madri]

 5B515909-DC57-468C-8138-9F634247FABC.jpeg

Hello, please, I have damaged the 2c42 tester by measuring in alternating voltage when I had it in ohms. I have changed the resistors R14 and R15 that were burned but it remains the same. I have measured voltages in the area that I indicate in the photo and where there should be 5 volts there are 4.94 volts which seems to be fine but where there is -5 volts I have measured -3.4 volts. And the third measurement is 3.3 volts and the measurement it gave is 2.9 volts. I have also noticed that there is an integrated LTRA that heats up more than normal next to these measurements but I cannot find a datasheet.
I put photos

Hi.

LTRA seems to be LT1931:

https://www.analog.com/media/en/technical-documentation/data-sheets/1931fa.pdf

But for what you said, this IC seems to be working just being overloaded, something else could be damaged an taking a lot more current that the IC can provide (or its components). R14/R15 are just to close to U4, your meter is it working and just giving bad readings?, if isn't responding at all U4 probably it's gone.

Thanks for answering if the tester works but only the oscilloscope. The optocouplers I have changed them all. U4 I can't find it to buy it. You could replace it with this ?  https://es.aliexpress.com/item/10000295208094.html

[.rpv]

Didn't seem to be the same part.

You can test if U4 it's really bad, remove it from the board and test the voltages again, but yeah, it really seems that U4 it's gone.



Some one post a forum where it seems that you can get support from hantek:

https://www.eediscuss.com/forum.php?mod=forumdisplay&fid=44&page=1

[Microcheap]

The LTRA is indeed a LT1931 and your voltages are fine. Hantek is using lower voltages to apparently save some battery. That was discussed earlier in this thread.

Check all resistor and diodes around U4 and see if they are all fine but it's likely that U4 is gone.


The DMM chipset is the CS7721CN from Semico and I don't think you can find it to buy in small volume (I couldn't find). You can try to contact Hantek but if they can't help you, I still have here some chips they sent me some time ago. I have no idea how much it would cost to ship it to Spain but it shouldn't be that expensive.

[masta_k74]

I don't know if this is relevant to anyone here, but there is now relatively good firmware for the 2D72 from Joy-It. German, English and French can be selected as languages. I have not found anything negative about it so far.
For me, it works much better then the original Firmware from Hantek.
You can find it on this page, bottom right: https://joy-it.net/en/products/JT-DMSO2D72

[jorgemef]

Are those TFT screens available somewhere? My 2C42 developed a vertical line just 2 months after purchasing it. Got very little use in fact.
Model of LCD is FPC-TFT028F014.V0. Cannot find it on Aliexpress or so.

[Microcheap]

Yes, those are standard 2.8" TFT display with a 40pin flat cable. I think the controller is ILI9341 compatible.

I have a tray of them left here:



I'm not 100% sure, but I think the second option from this seller could fit: https://www.aliexpress.com/item/32862869103.html

[jorgemef]

Hantek through Aliexpress support sent me a new screen as was under warranty. I replaced it and is working like a charm now. 

[Paroidia]

So I have have found that my 2C72 will not reliably report the value of capacitors higher than 20µF. With 22µF caps I get inconsistent results, some report the value, some give a "0L" It seems to work fine with caps 20µF or smaller. Larger caps either give "0L" or wildly inaccurate results e.g a 47µF reporting 80µF and then the same value and manufacture cap on another board (Samsung Electro Mechanics SMT cap) reporting "0L" Interestingly 20µF is exactly the same limit as this device, also from Hantek.

http://www.hantek.com/products/detail/16180

 Is this just my particular 2C72? Everything else works fine except for this and it's not really a deal breaker. Mostly I would use the MM part for measuring DC voltage but I don't want a defective unit either.

 EDIT: Never mind it works, I am used to my Agilent meter reading caps more or less accurately on a PBC. I forgot you are supposed to remove a cap from the board before testing it.