[GreenKeys] Measuring Electromagnet Saturation?

[WA5CAB at cs.com]

Oh, good Lord.  You can't measure inductance with a DC source, regardless of 
source impedance.  And the solenoid coil impedance is just the DC coil 
resistance.

Just measure the core flux density as you increase the magnetizer current.  
The last three-terminal Hall sensors I bought more than ten years ago cost 
under $10 in unit quantities.  And would drive a multimeter.

In a message dated 7/30/2007 8:25:01 PM Central Daylight Time, ham at cq.nu 
writes: 
> Well assuming we are still trying to measure, rather than compute the  
> value:
> 
> Drive the coil with a high impedance constant current source. Then  
> either measure the inductance or impedance. A fancy way would be to  
> apply fixed AC + variable DC current. Then you could monitor the  
> voltage on the coil with your 'scope.
> 

Robert & Susan Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at comcast.net> (Backup email)