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Upgrading the Hantek DSO4072C and DS4104C oscilloscopes bandwidth up to 250MHz

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Muellmann:
I got the LT1721CGN + SN74AHC1G08DBVR and soldered my Pulse Generator Board. I some did measurements with an Agilent DSO-X 3024A (200MHz bandwidth) and my hacked DSO4084C (250MHz bandwidth). I measured with the same 300MHz 1:10 Agilent probe. I compensated it individually to each scope before doing the measurement.

Sad to say the pulse generator is not as good as LT promised. They told it should have 560ps rise time but I can measure only about 2ns. No surprise, the datasheet of the AHC08 (the output stage) says risetime with 15pF load: min 1ns, max 7ns. The measured 2ns seems to be a good value with my ugly wireing.

Both oszilloscopes showed nearly the same shape with the same rise time, for 2ns only about 170MHz bandwidth is neccessary to measure. So far, so good.
To fully check for the bandwidth limit I still need a better generator. Maybe I can get a 250,000000 MHZ TCXO Oscillator chip to do more measurements...

DEBO:
Hi, the DSO4072C model has been superseded with the DSO4072S. I went to buy one from Aliexpress and found this in the description "Note:  Older model is DSO4072C now update to DSO4072S , the function is the same . what we sent is DSO4072S new version" .

Has anyone received the new model yet?  Is it still hackable?

Microcheap:
I think they are exactly the same, the "S" version could have been rebadged by some distributor for the Chinese market only. If you check Hantek's website there's no mention about this "s" model.

https://www.eediscuss.com/forum.php?mod=viewthread&tid=14958

kuken:
I bought a damaged Voltcraft DSO-1084E oscilloscope, it was hanging on the boot screen. I was able to fix it and then I found this topic and decided to run the built-in generator and extend the frequency to 250MHz. I modified my oscilloscope according to the description in PDF, very good description. Not calibrating yet generator, then started it to check if it generates anything, connected CH1 to out gen and in the whole range up to 25MHz the generator works, but not exactly, the amplitude is too low and the frequency jumps slightly. I decided calibrate it. However, when trying to calibrate, DDS calibrate amp filed. I bought the parts on Aliexpress. What could be wrong, any suggestions?  ???

After push calibrate button, UART shows:


--- Quote ---[root@Hantek ~]#anolis_widget_rect:394 widget!=NULL&&rect!=NULL failed.
util_thread_pause:thread 0x9fd0f0 is paused
util_thread_pause:thread 0x9ec690 is paused
acq_dot_nm_of_timerange =4000,time_range=3200000000,dso_acq.dot_factor =1,sample_rate =1250000.000000
dso_acq_control:1:2056, 2056,0
dso_acq_control:2:2056, 2056
dso_acq_control:3:205600, 207200
dso_acq_control:4:after= 205600, before= 207200
acq_dot_nm_of_timerange =4000,time_range=3200000000,dso_acq.dot_factor =1,sample_rate =1250000.000000
dso_acq_control:1:2056, 2056,0
dso_acq_control:2:2056, 2056
dso_acq_control:3:205600, 207200
dso_acq_control:4:after= 205600, before= 207200
measure_helper_set_one_chn_all_only:0
dds_calibrate_uniformlize_offset:0x100011
dds_calibrate_uniformlize_offset:0.000000, 3.500000, -3.500000, 0.000000, 1.000000, 0.285714, 0.000000
dds_calibrate_uniformlize_amp:0x100011
dds_calibrate_uniformlize_amp:7.000000, 1.500000
**********amp_value = 0.214286,amp = 438,cal_value =1.000000
util_thread_resume:thread 0x9ec690 is resumed
util_thread_resume:thread 0x9fd0f0 is resumed
util_thread_pause:thread 0x9fd0f0 is paused
util_thread_resume:thread 0x9fd0f0 is resumed
update_trigtime:0.000000, 0.0s
anolis_picture_copy_to_data_rgb565:672 oy < dh failed.
dds_calibrate_uniformlize_offset:0x100011
dds_calibrate_uniformlize_offset:0.000000, 3.500000, -3.500000, 0.000000, 1.000000, 0.285714, 0.000000
dds_calibrate_uniformlize_amp:0x100011
dds_calibrate_uniformlize_amp:7.000000, 1.500000
**********amp_value = 0.214286,amp = 438,cal_value =1.000000
dds_calibrate_uniformlize_offset:0x100011
dds_calibrate_uniformlize_offset:0.000000, 3.500000, -3.500000, 0.000000, 1.000000, 0.285714, 0.000000
**********amp_value = 0.000000,amp = 0,cal_value =1.000000
dds_calibrate_uniformlize_offset:0x100011
dds_calibrate_uniformlize_offset:1.000000, 3.500000, -3.500000, 3.500000, 1.000000, 0.285714, 0.000000
**********amp_value = 0.000000,amp = 0,cal_value =1.000000
max =1.082851

--- End quote ---

Muellmann:
today I was able to do more tests with a very old UHF wobble generator (1969). I was able to measure a 200MHz sinus at about 1V amplitude. This looks good but I didn't confirm with a calibrated equipment. I will come back...

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