Its clear there are EMI and RFI issues galore in digital audio stuff. What I think will be my next real tool will be a spectrum analyzer. Once those arrive I'll try to show what can be done with a VNA.

I would get one of these to explore but I already have this: Product Details | Keysight and just spent $80 on a pair of 75 Ohm to 50 Ohm minimum loss matching pads to make the 75 Ohm unit more useful. With a VNA you can check frequency response, phase shift, create bode plots, measure losses in cables, crosstalk and shielding (limited by the systems dynamic range), measure resistors and reactive components, crystals, tuned circuits etc. That should be fine for most audio related applications. The one linked goes from 50 KHz to 300 MHz. First keep in sight the input and output level limits and the useable frequency range. Thanks for any insights on this you may have ?īefore maybe venturing into buying one it could be interesting to hear what the really practical uses may be for such a device. be used for precision phase noise measurements, or. but I am wondering what else they may be used for? May they e.g. 3) - YouTubeĪpparently they can be used to make precision measurements of inductors and capacitances - and another diyaudio member mentioned that they might also be used for amplifier loop gain measurements. NanoVNA - Measuring Inductors and Capacitors (Vers. #359 How to properly use a NanoVNA V2 Vector Network Analyzer & Smith Chart (Tutorial) - YouTube These nanoVNAs are available in different models ranging from (as far as I can see) 10 kHz up to 3 GHz bandwidth and somewhat different specs.Ī couple of videos on how to use them can be found here: New 2.8 inch LCD Display NanoVNA VNA HF VHF UHF UV Vector Network Analyzer Antenna Analyzer + Battery| | - AliExpress

One of the replies came from 1audio who suggested a nanoVNA Vector Network Analyzer which may cost as little as ~30 Euros (or maybe even less): A couple of weeks ago I was looking for a way to make precision measurements of inductances and in this context posted a question about this in an inductance meter thread here on diyaudio.

Nanovna plus4