Hi,
I hope you don't mind
if I repeat here a question I made several days ago on a new thread "Siglent SVA1032X VNA mode: BW and sweep time are grayed" that probably went unnoticed by owners of the analyzer.
I am doing some measurements with an upgraded SSA3012X Plus in VNA mode.
When trying to measure the impedance of a 14 MHz XTAL on port 1 around resonance, I have found a very anomalous response
(see figure), although the instrument was correctly calibrated. The real series resonance is at a much lower resistance (a few ohms) and there is a parallel resonance around 15 kHz above the other: even a NanoVNA can show it.
My hypothesis is that the sweep time of the SVA is too fast, but I can't change it, because the relevant setting is always grayed. I have tried with
the BW setting (a lower value would force a slower sweep), but it
is also grayed and fixed at 10 kHz!I have tried other measurement setups (e.g. full-span, preset, S21 instead of S11, cycle power, ...), but in VNA mode BW and sweep time are always grayed, both from the VNA stimulus page and pressing the BW/sweep buttons (see figures).
The manual refers to those commands as normally usable, only saying that the default BW is 10 kHz.
I have normally used BW and sweep time settings on other VNAs (hp and Copper Mountain tech) for this purpose, when measuring devices like resonators or long lines.
Thank you very much for your help,
Roberto