Show us your noise floor

[Jay_Diddy_B]

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

[Jay_Diddy_B]

Hi, adding to the thread

Tektronix MSO24 2-BW-500

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



And with the high-res mode turned on:



Regards,
Jay_Diddy_B

[Jay_Diddy_B]

Hi,

Tektronix MDO4104-3  1 GHz scope



And with the high-res mode on:



Regards,
Jay_Diddy_B

[Jay_Diddy_B]

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 

Regards,

Jay_Diddy_B

[sonpul]

Siglent SDS1202X-E

[Aldo22]

I have run out of scopes. Please share yours 

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

Normal Mode, 400kPts


HR Mode

[Fungus]

Rigol DHO804: RMS ~66uV

[KungFuJosh]

Here's my SDS2504X HD.

[joeqsmith]

SJL Gigawave 6400 prototype showing both normal and probability distribution modes.

[hpw]

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.

[Furna]

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

[Furna]

Siglent SDS824X HD

Noise floor.png

[trackersoft]

Tek 784A all inputs at 50 Ohm 1 mv