Help with ...2 wire multi-tone technique for inductance measurements

[LVocho]

What's the diference between having a DMM to measure resistance and a LCR? I've seen many ATE's with both equipments, a DMM and LCR, the first one it is used to measure resistance (2 or 4 wire method) and the other one it is used to measure inductance or capacitance (always in 4 wire method). Why don't use the same device to do both measurements? Can I use a NI PXI7042 in order to get resistance and inductance from a DUT? Does multi-tone technique eliminates in someway the use of 4-wire method?
 has something to do with the DMM voltage-frecuency delivery capacity?
 
Any further explanations or comments will be most welcome!

[Tania Lozoya]

Hi LVocho,

You can use the PXI-4072 to measure resistance and inductance of an UUT.

If I am correct, the traditional way to measure inductance and capacitance technique uses a sine wave and a precision synchronous detector.

The PXI-4072 DMM uses a multi-tone signal, basically it generates a very precise square wave (in frequency domain has many frequency contents) and it?s harmonically limited.  You can find more details in the NI Digital Multimeters Help File:

<a href="http://digital.ni.com/manuals.nsf/websearch/9D5E03DA68E9F6C9862572C1005B0ABB" target="_blank"> http://digital.ni.com/manuals.nsf/websearch/9D5E03DA68E9F6C9862572C1005B0ABB</a>

And in the Getting Started Guide NI Digital Multimeters:

<a href="http://digital.ni.com/manuals.nsf/websearch/E7CCD5EDCF3980C3862572C1005B563F" target="_blank"> http://digital.ni.com/manuals.nsf/websearch/E7CCD5EDCF3980C3862572C1005B563F</a>

Also you will find very useful information in this page:

<a href="http://zone.ni.com/devzone/cda/tut/p/id/3297" target="_blank"> http://zone.ni.com/devzone/cda/tut/p/id/3297</a>

Specifically look at:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

<a href="http://zone.ni.com/devzone/cda/tut/p/id/3078" target="_blank"> http://zone.ni.com/devzone/cda/tut/p/id/3078</a>

<a href="http://zone.ni.com/devzone/cda/tut/p/id/3713" target="_blank"> http://zone.ni.com/devzone/cda/tut/p/id/3713</a>

Please let me know if you need more information.

Tania Lozoya | National Instruments | Mexico