Siglent has some catching up to do.
All SVAs and the nano V2 currently are hampered by the magnetics based coupler. It performs poorly at lower and upper frequency extremes. I'm experimenting with balun-less active reflectometer designs that can potentially give you decent directivity from DC to 6GHz. Siglent has some catching up to do.
Yes the factory cal (and ecal in the nano v2) hides the true directivity of the coupler. If the raw directivity is low, for example at very low frequencies where the balun is ineffective, the software has to subtract all the forward leakage and the result is more noise after calibration. The SVA series are architecturally very similar to the nano v2, which uses the same kind of coupler and the same method of obtaining the reference signal without an actual reference path (by using an RF switch before port 1 to short it out). I believe siglent has a custom ordered balun that can work up to 7.5GHz, but I'd be surprised if they can get 10dB raw directivity at 7GHz from that. I'd like to see the mentioned raw graphs during user cal.
I'm suspecting you can't turn off factory cal because the raw directivity of the coupler isn't very good and they don't want you to see that
I also see significant trace noise around 3GHz, it looks just like the nanovna V2. That is because it doesn't have a simultaneous reference receiver and can not cancel out synthesizer phase noise.
Don't bother comparing the original Nano to this, look at the V2 instead which has far better calibration standards and the VNA itself performs basically the same as the SVA.
All SVAs and the nano V2 currently are hampered by the magnetics based coupler. It performs poorly at lower and upper frequency extremes. I'm experimenting with balun-less active reflectometer designs that can potentially give you decent directivity from DC to 6GHz. Siglent has some catching up to do.
How to import cal data in s1p format to SVA1050X ?
Or i something disunderstand?
V2.2.1.2.7 2020/05/12
Notice:
This firmware must be upgraded from V2.1.1.1.12a or later. If your SVA1000X has an earlier version, please update to V2.1.1.1.12a first and then proceed to update to the latest version.
New Functionality:
Add Limit mask offset in SA mode
Frequency LOG scale in VNA mode
Add OPEN、SHOT、enhanced response in VNA mode
Add 85033D/E Cal kit in VNA mode
Save/recall .cal file in VNA mode
Port 1 power (TG) adjustable in VNA mode
Zero span in VNA mode
Improvements:
Smooth the glitch in Phase format in VNA mode
Solved Issues:
Fixed AM and FM symbol rate error, Lpf coefficient error, in AMA mode
Fixed Filter bandwidth error in DMA mode
Fixed Freq counter error in SA mode
Fixed Harmonic error in SA mode
Help Display error
V2.2.1.2.7 2020/05/12
Notice:
This firmware must be upgraded from V2.1.1.1.12a or later. If your SVA1000X has an earlier version, please update to V2.1.1.1.12a first and then proceed to update to the latest version.
New Functionality:
Add Limit mask offset in SA mode
Frequency LOG scale in VNA mode
Add OPEN、SHOT、enhanced response in VNA mode
Add 85033D/E Cal kit in VNA mode
Save/recall .cal file in VNA mode
Port 1 power (TG) adjustable in VNA mode
Zero span in VNA mode
Improvements:
Smooth the glitch in Phase format in VNA mode
Solved Issues:
Fixed AM and FM symbol rate error, Lpf coefficient error, in AMA mode
Fixed Filter bandwidth error in DMA mode
Fixed Freq counter error in SA mode
Fixed Harmonic error in SA mode
Help Display error
Disappeared...
http://s000.tinyupload.com/index.php?file_id=90679722209028843386
Do you think Siglent is planning a patch for the SSA to SVA hack?
Disappeared...
http://s000.tinyupload.com/index.php?file_id=90679722209028843386
Do you think Siglent is planning a patch for the SSA to SVA hack?
Hello,
I'm new on this thread as a user of my VNA from Siglent.
I just bought the SVA1032X and got strange behavior of it. The device shows some noisy signal but does not measure anything or generate a signal on tracking output...
Did anyone experience a similar problem with it? This is the fresh new device, with SW 2.2.1.2.5.
I thought there is a need for some initial password, but after a call to the seller, he confirmed not.
Thanks for any suggestions on that, before launching the official warranty return..
Thanks tautech for the prompt reply.
The point is that a tracking generator activates in a menu, but nothing is physically existing on the port 1 output. Also, the spectrum analyzer function is not operating - driving port 2 from the external signal source does not change observed background noise. Similarly like shorting ports together.
The Preset button, restart or factory reset from the system menu does not change device behavior.
Tomorrow I will send the unit for seller's inspection if nothing discovered during a day.
The first screen is exactly same as your after Preset.
The second is after TG activation with shorted ports - unfortunately no change in a trace.
I use original cables ordered together with an analyzer - they are fine, just tested on a parallel instrument.
Have no idea.
Notice: This firmware must be upgraded from V2.1.1.1.12a or later. If your SVA1000X has an earlier version, please update to V2.1.1.1.12a first and then proceed to update to the latest version.
New Functionality:
• Update EMI option to a new EMI measurement mode
• Added more VNA calibration kits with N/3.5mm type connectors to 4.5G/9.0GHz
• Added *.CSA file type to store instrument setup and calibration data in one file for easy recall and use of a saved state.
• Update user calibration data format.
CAUTION:
User calibration data taken with previous firmware revisions will no longer be compatible with the instrument after upgrading to V2.8. You will have to store new user calibration files if you update the instrument.
• VNA Port 1 output power and Port2 input Att adjustable
Improvements:
• Improve TG output harmonic performance
• Update Help file
Solved Issues:
• Fix some ADC overload warning
• Fix Ch Power calculation bug in small span