It's a very nice bit of gear and comes with calibration loads.
I've failed to get it going reliably on my primary machines, MacOS X and Linux so for now I'm using it on a Window virtual machine.
After calibration I connected up my 40 and 80m dipole antenna (both in parallel) and it gave me this wonderful SWR plot in about a second:
It also produces a Smith chart but I don't know how to interpret it.
It's astonishing that a home constructor can own test equipment like this.
I have much to learn.
Update: Now working under Ubuntu
The software for linux is a java application vna/J
The trick is to use the serial library installed like this: apt-get install librxtx-java
Here's the calibration dialog:
Update: Now working under MacOS X
I grabbed a copy of the rxtx library from here that works 64bit and copied it to /Library/Java/Extensions/ but as soon as the software tries to use the serial port, like during the calibration run, I'd get "VNADriverSerialPro::init() gnu.io.PortInUseException: Unknown Application".
The trick, thanks to this page, is:
sh-3.2# mkdir /var/lock
sh-3.2# chmod 777 /var/lock
Now everything's fine.