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| Siglent SSA 3021X plus high phase noise |
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| 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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