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| Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China |
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| egonotto:
Hello, the data sheet of DHO1000 says "Internal Capacity 8 GB" but in the "Storage setting menu" I only have just over 4000 MB. The bandwidth of my DHO1074 is about 85 MHz. With the 200 MHz license I also get about 200 MHz. The noise in the 1 mV/div range in 20 MHz mode is also about 10 % worse with the 200 MHz license. Even worse, the noise in the 1 mV/div range without bandwidth limitation is dramatically worse with the 200 MHz license. In channel 4 the noise triples. Best regards egonotto |
| Martin72:
--- Quote ---The bandwidth of my DHO1074 is about 85 MHz. With the 200 MHz license I also get about 200 MHz. --- End quote --- Interesting, maybe they use sharper filters. Because DHO804 (70Mhz) got appx 125Mhz bandwith, with hacking to 100Mhz I´ve measured appx 200Mhz. |
| thm_w:
--- Quote from: egonotto on December 14, 2023, 12:14:04 am ---Hello, the data sheet of DHO1000 says "Internal Capacity 8 GB" but in the "Storage setting menu" I only have just over 4000 MB. The bandwidth of my DHO1074 is about 85 MHz. With the 200 MHz license I also get about 200 MHz. The noise in the 1 mV/div range in 20 MHz mode is also about 10 % worse with the 200 MHz license. Even worse, the noise in the 1 mV/div range without bandwidth limitation is dramatically worse with the 200 MHz license. In channel 4 the noise triples. --- End quote --- The storage makes sense as that is free storage, android OS + the app, etc will take up 4GB easily, so probably they meant 8GB internal memory total in the datasheet. Something is off with your BW though as I measured ~400MHz -3dB above. - What is your signal source? Are you using 50R terminator? How many channels are active, do you have a trigger on the main channel that is active and not another channel? Run an FFT and look at the wfm. The noise will go way up yeah, as I mention above they need to implement a reasonable filter. I don't know if their AFE has selectable hardware filtering or not. If the noise is getting worse even with BW limit on that is odd though 10% is not huge. Here is a FFT compare of 2GS vs 1GS: I didn't measure pre/post hack but for CH1 I get 22uV (20MHz), 53uV (Max BW) on 1mV/div. |
| egonotto:
Hello, thank you for your answer. I used a T-piece with a 50 Ohm termination. The generator is a SDG6022X which had a different motherboard after a repair, with a SDG6052 license. I repeated the measurement with only channel 3 active and a sine wave with 4 Vpp. At 1 KHz I measured 2 Vpp. At 85 MHz I measured 1.4 Vpp. At 100 MHz I measured 1.25 Vpp. At 120 MHz I measured 1.03 Vpp. This time I checked the voltage with an RTA4000 with 1 GHz bandwidth. RTA4000 always measured about 2 Vpp. I'll get to the noise thing later, but the "I didn't measure pre/post hack but for CH1 I get 22uV (20MHz), 53uV (Max BW) on 1V/div." is probably at 1 mV/div? Best regards egonotto |
| core:
--- Quote from: egonotto on December 14, 2023, 12:14:04 am --- The noise in the 1 mV/div range in 20 MHz mode is also about 10 % worse with the 200 MHz license. Even worse, the noise in the 1 mV/div range without bandwidth limitation is dramatically worse with the 200 MHz license. In channel 4 the noise triples. Best regards egonotto --- End quote --- You can check my measurements here, it seems to be OK : https://www.eevblog.com/forum/testgear/rigol-hdo1000-and-hdo4000-12bit-oscilloscopes-launched-in-china/msg5207760/#msg5207760 I will try to replicate yours, just tell me the configuration. I have an SDG2042X unleashed. |
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