Products > Test Equipment

Siglent SSA 3021X plus high phase noise

(1/3) > >>

angelcruiz:
Hello,

I've got an SSA 3031X which, according to its datasheet and confirmed by several tests that I've found in this blog and somewhere else, should have a phase noise of around 98 dBc/Hz @ 10 KHz offset (specified with 1GHz input signal).

The problem is I can't get better than 85 dBc/Hz as seen in the attached picture.

The tests conditions are:

Unit: SSA 3021X Plus
SW ID: 3.2.2.5.1R1
Source: Siglent SDG 2042X
Input signal: 0 dBm, 10MHz
Span: 50 KHz
RBW: 100 Hz
VBW: 1Hz
15 Averages

Despite the datasheet test conditions being with a 1GHz input signal, several posts in this blog confirm the stated phase noise using input signals of 10 or 20 MHz.

I don't know whether the fact that my unit has been hacked has somehow messed up the internal PLL parameters that shape its phase noise, I have a defective unit or there's something else I'm doing wrong. Still, I've tested with multiple configurations (RBW and VBW of 1Hz, 20, 30 and 100 MHz input signals, etc) and I always measure no less than 85 dBc/Hz phase noise.

Do you have any clue?
Thanks in advance,

Angel.

Orange:
I just checked on my SSA3032X (non plus)

I get about 100dBc/Hz at 10MHz  @10kHz offset, BW 100Hz
Signal source is a SDG1062 at 10MHz, 0dBm

Mind you that this is not a plus model.

Seems that you have an issue with the SA or maybe the generator is at fault

Orange:
On more thing if you use the SDG2042X with external 10MHz clock it might also increase the noise, the PLL in the generator has a known problem.

tautech:
Try installing the latest FW:
https://int.siglent.com/upload_file/zip/firmware/Spectrum_analyzer/SSA3000X%20Plus_V3.2.2.6.0R7_EN.zip

angelcruiz:
Sorry, to be specific, the installed FW was SVA1000X_V3.2.2.5.1R1.

I've upgraded to SVA1000X_V3.2.2.6.0R7 and the results are still the same.

I've attached a noise floor test with RBW of 30KHz (50 Ohm termination input) since it seems to be also high for about 5 to 10 dB.

Could it be that the SVA calibrations are bad for an SSA or something like that?

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod