On Sun, 13 Oct 2019 at 11:06, <trevor.blake1@...> wrote:
The main feature of a Vector Voltmeter is that it can measure the
amplitude and phase of an independent signal (one not generated by the VV
itself). It can be useful for measuring embedded components. A simple VNA
does not (generally) have that capability. External buffers can of course
be added to the Fieldfox, to achieve the high impedance. Have to say I
never really liked the Fieldfox, seemed a very clumsy instrument to me.
I think the term ¡°vector voltmeter¡± in the FieldFox is a bit deceiving,
given the hardware called vector voltmeters have been available for years -
I used one for my final year project as an undergraduate.
I don¡¯t have much luck with FieldFoxs. The MTBF of those I have owned is
two weeks
* A factor reconditioned (CertiPrime) N9923A lasted a month. Before the
month was up I had found numerous firmware bugs.
* A used N9912A was DOA.
The DOA one was returned to the seller, who solid to an unsuspecting eBay
buyer.??
The capabilities of the cheapest in that range (N9912A) can¡¯t even measure
the phase of S21.
Those gripes aside, I thought it was a well thought out instrument, and
pretty easy to use.
*When I finally get my NanoVNA boxed up, it will have some features no
FieldFox has. *
Dave
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom
