Products > Test Equipment
Siglent SVA1015X and SVA1032X 1.5, 3.2GHz Spectrum & Vector Network Analyzers
IM3:
--- Quote from: dmytre on December 20, 2024, 02:41:16 pm ---
--- Quote from: IM3 on December 19, 2024, 06:25:29 pm ---Try checking if you have the correct levels in spectrum analyzer mode. It's possible that the input is blown.
--- End quote ---
The SA mode seems to be OK. And tracking generator is also OK. The output power corresponds to the set value.
This positive S11 could be calibrated but the dynamic range degrades.
I have attached the measurement in VNA mode of 8 dB and 20 dB attenuator. S11 ~ -40 dB could not be measured and -16 dB is more noisy than it was before this HW error.
Has anybody seen similar issue?
--- End quote ---
I repeated your measurement as you described it and got roughly the same result.
I don’t think there’s anything defective, but you may be making a measurement error. The span of 3 GHz is quite large. Also, the measurement with a 20 dB attenuator can give strange results because the reflection should then be 40 dB. If not everything is set up correctly, you won’t achieve that.
Do this:
Make sure your stimulus level is -10 dBm. It might have been set much lower in your initial measurement and lowers dynamic range.
Reduce the span for now because it’s quite large.
Set a start frequency at for example 250 MHz.
Set a stop frequency at for example 500 MHz.
Perform a 1-port calibration with a good LOS (Load-Open-Short).
After that, don’t use your attenuators first for a control measurement but use the Load from your LOS. You should then be able to achieve at least 50 dB Return Loss.
If you achieve this, I don't think there’s anything wrong with your VNA.
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