Products > Test Equipment
SSA3032X-R AVG100 Scectra of LiteVNA64
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KeBeNe:
I think it is a software error, both your devices show the same behavior, I suspect the FFT scan is segmented.
It would be very helpful if your used both the same settings, i.e. RBW, VBW, Span etc.
You can also switch the device to not use the FFT, maybe try that.

Maybe @tautech can say something about it
tautech:

--- Quote from: KeBeNe on October 18, 2023, 01:56:36 am ---Maybe @tautech can say something about it

--- End quote ---
Little sorry.
Source = SDG6022X @10 MHz 0dB
Results from SHA852A and SVA1032X attached.
kladit:
The noise distribution the analyzer shows is correct and has to do with the Rayleigh function.
(dl4raj you remembered the right thing)
I am anything else but not a mathematician, so I can not serve with a simple answer, but the internet is informational about.
google "rayleigh noise spectrum"analyzer "
An interesting article is "hp_sa_and_noise_5966-4008e_an_1303.pdf" and one of keysight, lost here in the shuffle
at the moment.

What still is not to explain is the difference of the the amount of noise shown
between our instruments. They should show not more than less  of a dB difference.
   
We should agree on setup for comparison. Same frequency, span, attenuation, bandwidth, signal level, cables etc.
RG58 is not  double shieded, and  MIL  is meaningless in this context.
You have not answered if we have the same firmware in our instruments.

Your noise  was much higher even at the high frequency side, the cause of that has to be investigated first.

I have sent you my phone number, look at your messages, so I think we can advance the progress of solving this mystery.
markus_jlrb:
Dears,

I have checked the FW Version -> SW1: 3.2.2.6.0R8, SW2: 20230621-1513 20221101-1700, HW: 01.01.04

In addition to my past measurements with the LiteVNA-64, I have now used my SDG6022X at 10MHz and 100MHz
to document my findings again at span of 50, 100, 200 and 500 kHz.

Please see the attached screen shots taken from the SSA.

Markus


[ Specified attachment is not available ]
markus_jlrb:
Sorry the 10MHz 50KHz pic got lost during atteching it.
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