开云体育

I connected a piece of coax to the nano and, at the far end, connected first a resistor, then a capacitor, then an inductor. I read the nano screen in all three cases and the value indicated was within about one percent of what my lab quality gear measured. It's an amazing device, really. As I raise the frequency, the reading changes (always putting the marker at the cable end). So it's good to see, for example, how an ordinary resistor behaves at rf. I should try a resistor and reactance in series and see how it separates them. I will try a resonant circuit as well so I can read the resonant frequency and maybe Q. It might work to check crystals as well. As you know, the frequency accuracy is better than 1 ppm.

The range over which it's accurate isn't too great but for most measurements it's entirely adequate. The signal level is around -10 dBm, about 1/10 milliwatt, not enough to damage parts.

I have already measured cable length but that's a lot of trouble; cable attenuation is very easy to read. Next I will see how it measures characteristic impedance of coax. As an antenna analyzer it's very good but it has many more uses than that.

I might see if I can calibrate it as an rf voltmeter.

I have already gotten my money's worth out of it.

It might work to check crystals as well.

Check under test jigs in /g/nanovna-users/wiki/Application-Notes

I built a fixture to make it easy to test through-hole and SMT parts



You can use the ZIF socket with resistance as calibration standards and it
works well up into the UHF.

Dan

On Mon, Nov 25, 2019 at 8:08 PM Bob Albert via Groups.Io <bob91343=
[email protected]> wrote:

I connected a piece of coax to the nano and, at the far end, connected
first a resistor, then a capacitor, then an inductor. I read the nano
screen in all three cases and the value indicated was within about one
percent of what my lab quality gear measured. It's an amazing device,
really. As I raise the frequency, the reading changes (always putting the
marker at the cable end). So it's good to see, for example, how an
ordinary resistor behaves at rf. I should try a resistor and reactance in
series and see how it separates them. I will try a resonant circuit as
well so I can read the resonant frequency and maybe Q. It might work to
check crystals as well. As you know, the frequency accuracy is better than
1 ppm.

The range over which it's accurate isn't too great but for most
measurements it's entirely adequate. The signal level is around -10 dBm,
about 1/10 milliwatt, not enough to damage parts.

I have already measured cable length but that's a lot of trouble; cable
attenuation is very easy to read. Next I will see how it measures
characteristic impedance of coax. As an antenna analyzer it's very good
but it has many more uses than that.

I might see if I can calibrate it as an rf voltmeter.

I have already gotten my money's worth out of it.