Gary's inductance measurement Was: Inexpensive LCR-Multimeter

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Barton B. Anderson by way of Terry Fritz <teslalist-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Gary,

While browsing through today's postings, I see you measured primary 
inductance characteristics and noted negligible change with frequency. I 
expect you have made this measurement with the secondary also. If so, can 
you confirm inductance change with frequency in the secondary and 
approximately how much? If you've already posted that data, please forgive.

Take care,
Bart

Tesla list wrote:

>Original poster: "Lau, Gary by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><Gary.Lau-at-hp-dot-com>
>
>Why is it necessary to measure inductance at different frequencies?
>My characterizations of different primary coils with a _very_ expensive 
>HP4194 impedance/gain-phase analyzer showed negligible variation of 
>inductance with frequency.