Products > Test Equipment
Siglent SSA 3021X plus high phase noise
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?
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