George,
you asked on 1 Jun 2004: > I need to measure the impedance (low frequency, low power) of > up to 16 leads. So I need an impedance analyzer and a multiplexer. > Currently we have a GPIB controlled multiplexer and impedance > analyzer, but would like a more compact system. Is there anyway > to do this using PXI or SCXI so that we can have a smaller package? > I can't seem to find an impedance analyzer for either chassis - > just resistance measurement.
I do not really know what an impedance analyser does other than measuring the resistance or impedance = 1/resistance of an object. IMHO a resistance measurement should be sufficient.
BUT keep in mind that multiplexing adds some extra (and variable) resistance into the path, either from the relais or the semoconductors. In order to get reliable results you should use a 4-wire technique, e.g. loading the UUT with a current using two wires and sensing its voltage with another two wires.
This is also the way if you need an impedance-voltage-relation or some other dependencies.
HTH and
Greetings from Germany!
--
Uwe Frenz
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Dr. Uwe Frenz Entwicklung getemed Medizin- und Informationtechnik AG Oderstr. 59 D-14513 Teltow
Tel. +49 3328 39 42 0 Fax +49 3328 39 42 99 [EMAIL PROTECTED] WWW.Getemed.de
