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Author Topic: Show us your noise floor  (Read 1127 times)

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Offline Jay_Diddy_BTopic starter

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Show us your noise floor
« on: September 05, 2024, 08:13:17 pm »
Hi group,

The recent introduction of the Keysight HD3 series of oscilloscopes has prompted a discussion on noise floor.

Please share your oscilloscope's noise floor here.

To get this started:

Tektronix MSO46 4-BW-500

Sample mode, full bandwidth, 1mV/div



Hi-Res Mode 1mV/div



Hi-Res Mode 5mV/div



Regards,
Jay_Diddy_B



« Last Edit: September 05, 2024, 08:17:22 pm by Jay_Diddy_B »
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Offline Jay_Diddy_BTopic starter

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Re: Show us your noise floor
« Reply #1 on: September 05, 2024, 08:40:39 pm »
Hi, adding to the thread

Tektronix MSO24 2-BW-500

This scope does not have an internal 50 \$\Omega\$ termination. This is with input open.



And with the high-res mode turned on:



Regards,
Jay_Diddy_B


« Last Edit: September 05, 2024, 08:42:55 pm by Jay_Diddy_B »
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Offline Jay_Diddy_BTopic starter

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Re: Show us your noise floor
« Reply #2 on: September 05, 2024, 08:44:53 pm »
Hi,

Tektronix MDO4104-3  1 GHz scope



And with the high-res mode on:



Regards,
Jay_Diddy_B
« Last Edit: September 05, 2024, 08:46:45 pm by Jay_Diddy_B »
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Offline Jay_Diddy_BTopic starter

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Re: Show us your noise floor
« Reply #3 on: September 05, 2024, 09:04:52 pm »
Hi,

Agilent DSO-X 3034A (with BW50 500 MHz option)



And with the high resolution turned on:




I have run out of scopes. Please share yours  :D

Regards,

Jay_Diddy_B
« Last Edit: September 05, 2024, 09:07:50 pm by Jay_Diddy_B »
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Offline sonpul

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Re: Show us your noise floor
« Reply #4 on: September 05, 2024, 09:26:46 pm »
Siglent SDS1202X-E
« Last Edit: September 05, 2024, 09:43:22 pm by sonpul »
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Offline Aldo22

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Re: Show us your noise floor
« Reply #5 on: September 05, 2024, 10:00:46 pm »
Quote from: Jay_Diddy_B on September 05, 2024, 09:04:52 pm
I have run out of scopes. Please share yours  :D

The $150 Hantek DSO2000 is probably not comparable, but here it is anyway.

Normal Mode, 400kPts


HR Mode

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Online Fungus

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Re: Show us your noise floor
« Reply #6 on: September 05, 2024, 10:09:11 pm »
Rigol DHO804: RMS ~66uV
« Last Edit: September 05, 2024, 11:39:03 pm by Fungus »
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Offline KungFuJosh

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Re: Show us your noise floor
« Reply #7 on: September 05, 2024, 11:07:14 pm »
Here's my SDS2504X HD.
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Offline joeqsmith

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Re: Show us your noise floor
« Reply #8 on: September 07, 2024, 12:29:36 am »
SJL Gigawave 6400 prototype showing both normal and probability distribution modes.
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Offline hpw

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Re: Show us your noise floor
« Reply #9 on: September 07, 2024, 08:18:20 am »

Here some 8 / 12 / 14 bit simulations with 64K / 1M / 16M FFT & "von Hann FFT Window" and without any averaging.

So be carefully to compare FFT noise floor with various FFT size settings. Even used detectors algorithm.
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Offline Furna

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Re: Show us your noise floor
« Reply #10 on: September 15, 2024, 12:38:07 pm »

Siglent SDS824X HD

Noise 20M 5mV-1mV.png
BW 20MHz
PP215 set 10X: CH1 1M and CH2 50Ω external terminator feed through. Vertical at 5.00 mV (limit when 10X)
Elditest GE2501 set 1X: CH3 1M and CH4 50Ω external terminator feed through. Vertical at 1.00mV


Noise 200M 5mV-1mV.png
BW 200MHz
PP215 set 10X: CH1 1MΩ and CH2 50Ω external terminator feed through. Vertical at 5.00 mV (limit when 10X)
Elditest GE2501 set 1X: CH3 1MΩ and CH4 50Ω external terminator feed through. Vertical at 1.00mV
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Offline Furna

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Re: Show us your noise floor
« Reply #11 on: September 16, 2024, 07:01:57 pm »

Siglent SDS824X HD

Noise floor.png
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Offline trackersoft

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Re: Show us your noise floor
« Reply #12 on: September 18, 2024, 07:08:24 pm »
Tek 784A all inputs at 50 Ohm 1 mv
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