Products > Test Equipment
Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China
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ebastler:

--- Quote from: ZhuraYuk on December 06, 2023, 06:36:29 pm ---Looks like the noise floor is different depending on the model. I have 23uVrms in mine DHO1072 vs 17uVrms in your DHO1074. Or mine is faulty.

--- End quote ---

Sampling rate was not the same though. You had just one channel active at 2 GSa/s, while core ran two of them at 1 GSa/s. Maybe that explains some of the difference?
ZhuraYuk:

--- Quote from: ZhuraYuk on December 06, 2023, 01:17:56 pm ---Just got mine 1072 from rigol.com.pl
Hardware 9
Firmware 2.04


Options unlocked, Upgraded to 2.12
Noise 200Mhz inputs shorted, DC 1ms/div 2GSa/s 100Mpts 1mV/div:
575uVpp  105uV ACRMS  normal mode
375uVpp  58uV ACRMS  14-bit mode
296uVpp  26uV ACRMS  16 bit mode

Noise 20Mhz inputs shorted, DC 1ms/div 2GSa/s 100Mpts  1mV/div:
262uVpp  23uV ACRMS  normal mode
238uVpp  21uV ACRMS  14-bit mode
222uVpp  19uV ACRMS  16 bit mode


Dave's setting from the video
Noise 200Mhz inputs shorted, DC 1ms/div 50MSa/s 1Mpts 1mV/div:
661uVpp  69uV ACRMS  normal mode
252uVpp  28uV ACRMS  14-bit mode (50Mhz BW)
192uVpp  22uV ACRMS  16 bit mode (25Mhz BW)


Noise 20Mhz inputs shorted, DC 1ms/div 50MSa/s 1Mpts 1mV/div:
237uVpp  24uV ACRMS  normal mode
108uVpp  12uV ACRMS  14-bit mode (1.25Mhz BW)
90uVpp  10uV ACRMS  16 bit mode (625kHz BW)

The scope is not grounded,  after I connected the ground the noise values not changed.

--- End quote ---

Thanks for pointing out core I edited original post with correct BW
ZhuraYuk:

--- Quote from: ebastler on December 06, 2023, 06:42:26 pm ---
--- Quote from: ZhuraYuk on December 06, 2023, 06:36:29 pm ---Looks like the noise floor is different depending on the model. I have 23uVrms in mine DHO1072 vs 17uVrms in your DHO1074. Or mine is faulty.

--- End quote ---

Sampling rate was not the same though. You had just one channel active at 2 GSa/s, while core ran two of them at 1 GSa/s. Maybe that explains some of the difference?

--- End quote ---

I did exactly the same setup as on his screenshots later, with sample rate and everything identical. Still 23uV ACRMS noise floor.
core:
Regarding the fans noise, it's not silent at all.

I have MSO5000, and I've been considered it noisy until now, but compared with DHO it's almost silent.
The level is higher, but also the spectrum freq is higher.

I've found an open source noise level apps, named Spectroid and I've made some measurements at about 1m in front of them.
I have attached some pictures, also one for reference, only a computer running in the room.
Also the available options.
Yeah, I will play around with Spectroid, to see if it can be used as a comparative tool.
core:

--- Quote from: ZhuraYuk on December 06, 2023, 07:01:13 pm ---
--- Quote from: ebastler on December 06, 2023, 06:42:26 pm ---
--- Quote from: ZhuraYuk on December 06, 2023, 06:36:29 pm ---Looks like the noise floor is different depending on the model. I have 23uVrms in mine DHO1072 vs 17uVrms in your DHO1074. Or mine is faulty.

--- End quote ---

Sampling rate was not the same though. You had just one channel active at 2 GSa/s, while core ran two of them at 1 GSa/s. Maybe that explains some of the difference?

--- End quote ---

I did exactly the same setup as on his screenshots later, with sample rate and everything identical. Still 23uV ACRMS noise floor.

--- End quote ---

Strage, we have to see an DHO1072 inside and compare with 1074 regarding the input stages.
If are the same, it can be a matter of luck regarding the cips installed.

Both channels have the same level of 23uV noise ?
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