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
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod