Products > Test Equipment
Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China
thm_w:
--- Quote from: egonotto on December 14, 2023, 02:43:12 am ---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?
--- End quote ---
oops, yeah 1mV/div.
--- Quote from: egonotto on December 14, 2023, 02:43:12 am ---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.
--- End quote ---
Interesting, well that gen is more than good enough so maybe mine is an issue. Still, can you do the FFT of a 50R short on channel 1 as I showed above and post here? 2Gs/s, span 0 to 1GHz.
You can try lower voltage ranges, but the difference in BW should not be huge between them.
egonotto:
Hello,
I haven't really understood how to use FFT with the DHO1074 yet. The 200 MHz license is activated.
Here are a few noise measurements.
Now to the frequency response (50 Ohm):
With 500 mVpp I determined about 240 MHz.
1 kHz 264 mVpp
2 MHz 234 mVpp
100 MHz 220 mVpp
200 MHz 208 mVpp
240 MHz 184 mVpp
250 MHz 176 mVpp
300 MHz 164 mVpp
400 MHz 108 mVpp
Best regards
egonotto
Martin72:
How good it would be if Rigol included the average mode.
You would have to write a petition...
egonotto:
Hello,
you mean average for FFT?
How is the noise of the Siglent SDS2104X HD in the range of 1mV/div and 1 V/div at 1 ms/div and about 50 MS so that we can compare it with the Rigol?
Rigol 20 MHz with 50 Ohm termination:
1 mV/div: noise is about 23 uVrms
1 V/div: noise is about 9 mVrms
Rigol 200 MHz 50 Ohm termination:
1 mV/div: noise is about 103 uVrms
1 V/div: noise is about 11 mVrms
Best regards
egonotto
PS: But sometimes you get different values, for whatever reason.
As the pictures show.
2N3055:
--- Quote from: egonotto on December 15, 2023, 03:12:04 pm ---Hello,
you mean average for FFT?
How is the noise of the Siglent SDS2104X HD in the range of 1mV/div and 1 V/div at 1 ms/div and about 50 MS so that we can compare it with the Rigol?
Rigol 20 MHz with 50 Ohm termination:
1 mV/div: noise is about 23 uVrms
1 V/div: noise is about 9 mVrms
Rigol 200 MHz 50 Ohm termination:
1 mV/div: noise is about 103 uVrms
1 V/div: noise is about 11 mVrms
Best regards
egonotto
PS: But sometimes you get different values, for whatever reason.
As the pictures show.
--- End quote ---
8µ RMS and 300µV P-P at 1mV/div is not right.....
Something very wrong there.
As requested, from SDS200X HD (1ms/div, 2GS/s, 20MPts, 50 Ω):
20MHz BW
1mv/div - 23 µV ACRMS
1V/div - 4 mV ACRMS
200MHz BW
1mv/div - 48 µV ACRMS
1V/div - 5,2 mV ACRMS
FULL BW (cca 550 MHz)
1mv/div - 74 µV ACRMS
1V/div - 5,4 mV ACRMS
Like I said before, 2000XHD is better. Also, you can clearly see how at 1mV/div noise of preamp before AA filter is dominant, and at 1V/div ADC noise is...
But DHO1000 does decent job nevertheless, hardware vise. It is not best in class scope, but affordable one, and for the price range not bad at all.
But software really needs work... :palm:
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