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| New Hantek DSO2X1X models? |
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| phmarek:
--- Quote ---I can't subjectively notice any speed penalty with SCPI (Attached image shows downloaded wave data). --- End quote --- Well, did you ever try getting a 2 channel 4Msamples dump? As SCPI runs in ~4kB blocks it's about 2000 round trips - you might see a measurable difference then. (And that download speed is why I started my patch, see https://github.com/phmarek/hantek-dso2000-quick-fetch.) |
| Aldo22:
--- Quote from: phmarek on March 10, 2024, 02:32:54 pm ---Well, did you ever try getting a 2 channel 4Msamples dump? As SCPI runs in ~4kB blocks it's about 2000 round trips - you might see a measurable difference then. --- End quote --- Yes, thank you, you're certainly right. Like the official Hantek Windows software, I only download 4kpt data to get a somewhat up-to-date image. Everything else is too slow anyway, with or without the USB-Isolator. I'm interested in remote control of the device because I prefer to enter values with the keyboard and mouse rather than turning dubious rotary encoders. I need the image to set triggers, positions and cursors. It doesn't have to be particularly detailed (deep memory). Btw. since the update 2024.02.02_fpga_3208 I haven't had a single crash and I use it several times a day. It's really stable now. |
| Aldo22:
I am answering my own question (again ;) ). Apparently there is a big difference with the RF frequency response depending on "which side" of the relay you are on (200mV/div vs. 500mV/div) I made the measurement above with 200mV/div, this new one below with 500mV/div. At 500mV/div the frequency response is within 3dB up to 150Mhz. I didn't find the phenomenon mentioned here, but it is discussed on 4pda. So with 200mV/div the amplitudes are usable up to about 60/70MHz afaics. Of course, this is not a reliable measurement, I don't have the tools for that. But as an impression it will probably be correct. |
| DavidAlfa:
The bandwidth is normally specificied for a -3dB amplitude range. |
| Aldo22:
--- Quote from: DavidAlfa on March 15, 2024, 05:13:55 pm ---The bandwidth is normally specificied for a -3dB amplitude range. --- End quote --- Yes, maybe the topic is a bit fragmented now. I originally measured an amplitude increase of +10dB from 1MHz to 150MHz at 200mV/div. That had puzzled me. It is not very good and there are comments on this problem on 4pda. At 500mV/div and above the frequency response looks good up to 150MHz (see new measurement one message above yours), i.e. within (-)3dB (Externally amplified signal). |
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