DSO4072c AFG AM modulation frequencies

FSC · Post time 2020-4-27 21:05:09

Hi,
I tried to set up an AM on my DSO4072C.
- I pressed the GEN/DSO-Button
- I set Wave with F1/F2-key to AM/FM
- I set Type to AM
- I set Freq to 1000Hz
- I set F0 to 10.00kHz
The rest is a default. In the display the proper signal is displayed. But when I mesuare the signal it does not look right. It semms that modulation frequency and carrier frequency are swapped (this is prooved by the FFT.
When I then set Frequency to 10kHz and F0 to 1kHz the signal looks correct but that is different to the documentation and to the common understanding that F0 is the carrier frequency.
Is it possible, that there is a bug?
Also it is not clear to me when the data is aclnowledged by the scope. sometime you have to change to another field and sometimes a cahnge of value is applied directly. Alos it is not clear to me when the number pad appeares and when the field is only highlighted to be modified by the V0 turn button.

FW is the latest from the homepage:
- [sw] 3.50.0(191123.0)
- [hw] 1020xffffa000

Thanks an best regards
Florian

FSC · Post time 2020-11-4 16:50:54

Hi pavlenkoa,
no I still have also the same issue and as I am a developer of embedded software and implement DSP software for measuring devices, I don't think it should be that hard to fix THAT problem!
The problem is that the calculation of the FM/AM waveform is in my opinion- just not done in the correct way. F0 should indicate a carrier which is then modified by the modulation frequency. Not that hard... There are a lot of formulas on the net how to do it.
And also a lot of other hickups like the failing limitation of the values when turning the dials and erratic behavior of the increments when changing values.
And also the problem with the trigger position is in my opinion not fixed...

I did not have time to work a lot with the device in the last months and also got a personal reply about the questions I asked directly to the support in the spring. But I will try to follow up on that a little.

The problem is that this is very tiring and I don't see it as my duty to identify their bugs in a product I paid money for. And if they can't fix it I am open for a new device they can sent me and I will gladly use that as a beta tester and help them make it better but not when paying money for it!

cu
FSC

pavlenkoa · Post time 2020-9-5 00:18:04

Good day! I'm afraid to seem too persistent, but I want to ask: will anyone make a workable generator in DSO4102c? Is the topic of a non-working generator, for the purchase of which many paid, no longer interests anyone?

pavlenkoa · Post time 2020-8-2 19:19:59

I installed the latest firmware. The problem is not solved!!!!!!!!!!! I'm tired of sending you screenshots! Are your engineers having trouble identifying and fixing the problem on their own? Check out what we have been doing here since winter! I am sending a description of the same error - you write to me to download the latest firmware, I download it and see that the problem is not solved. I am sending screenshots again. It will go on forever. I want to hear the answer from your management - will a problem be solved that is not a problem for other manufacturers at all? Or is it beyond the power of your engineers? Write about it on the first page of your site! "WE CAN'T RELEASE PRODUCTS WORKING CORRECTLY!"

wangshuang · Post time 2020-7-22 18:14:46

pavlenkoa replied at 2020-7-21 20:58
Good afternoon, a long time has passed and the problem has not been resolved. The update from 06/1 ...

Hantek has released the latest firmware.
http://hantek.com.cn/products/detail/4163

pavlenkoa · Post time 2020-7-21 20:58:41

wangshuang replied at 2020-7-6 09:57
Sorry. A new version will be released next week.

Good afternoon, a long time has passed and the problem has not been resolved. The update from 06/11/20 did not touch on this topic - everything remained the same. DS4102c

wangshuang · Post time 2020-7-6 09:57:14

pavlenkoa replied at 2020-7-5 15:08
Hello! There is no answer for a very long time. A month has passed. The oscilloscope generator in mo ...

Sorry. A new version will be released next week.

pavlenkoa · Post time 2020-7-5 15:08:49

Hello! There is no answer for a very long time. A month has passed. The oscilloscope generator in modulation mode cannot be used. Please speed up the development of the software.

wangshuang · Post time 2020-6-12 10:01:30

Sorry for the late reply, the product engineer is already revising, and then release a new version, I will inform you in time.

pavlenkoa · Post time 2020-6-9 18:29:27

Edited by pavlenkoa at 2020-6-9 18:35

Why is there no answer?
I want to use your device, but I can’t. It does not work as stated in the specifications! Please correct your flaws. Why am I forced to ask for this? Aren't you ashamed of your professionalism?

Imagine that you bought a car that turns anywhere, just not right! In addition, his speedometer is made purple, and on it are pink numbers that you can only see if you stop! What would you say about the manufacturers of this device? But they can’t, but you can produce such devices ?! I’m already thinking about buying an additional external generator, since my work must be done, and your car, even after repair (updating), has not learned how to drive to the right. And judging by the speed of your response to comments, he will never go.