On 4/10/14 2:38 PM, Jim Brown wrote:
On 4/10/2014 1:58 PM, Earl Morse wrote:
I confess, I am spoiled. I have access to a plethora of RF devices
such as network and impedance analyzers so I wouldn't have to make do
with making this measurement with a rigged up setup.
Actually, measuring ferrite chokes is not nearly as easy as it looks.
The only stand alone instrument I would trust the the HP impedance
analyzer. All reflection-based analyzers have the limitation of greatly
reduced accuracy as the impedance is much more than 1/5 or 5x the
circuit Z. There are HP applications notes that address this issue.
True, if you want to characterize, but if you're in the "sorting by mix"
mode, I think a lot of fairly simple test equipment can do the job.
You're looking for mu changes of a factor of 5 or 10, and you can pick
frequencies which work well.
For checking whether that mix 43 binocular core is within spec.. not a
chance with cheap and cheerful.
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