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In Reply to: RE: Start of winding, Triad C-40X Chokes posted by drlowmu on June 23, 2016 at 12:10:26
This 1.5hy choke at 40 ohms reads 1.316hyThis 500mh choke at 30 ohms is reading 396mhThis 500mh at 30 ohms and it reads 401mhThis 320mh at 10 ohms is reading 368mh
" This 320mh at 10 ohms is reading 367mh
These chokes all work well in the applications I have used them,especially the 10 to 30 ohm low mu chokes..There is a problem with consistent stated readings however,if the chokes were checked and rated with voltage applied,that can cause a variation in readings..I am impressed that the 320mh that Jeff recommended specs well because they do a phenomenal job in the Mac Mc30s.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 06/24/16Follow Ups:
Mike, I've got an older Sencor LC75. Nearly all chokes that I test in that device read a little below spec for inductance. I've wondered whether that could be due to the voltage and current supplied across the choke when the reading is made. In other words, the choke might behave more up to spec or beyond in terms of Henries, when used in circuit. Can you comment?
I've wondered whether that could be due to the voltage and current supplied across the choke when the reading is made. In other words, the choke might behave more up to spec or beyond in terms of Henries, when used in circuit.
The inductive reactance of an inductor increases as the frequency across it increases so depending on the frequency they tested these chokes at and where our testers are testing them at,we are going to get different readings.I assume they are tested at 120hz.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
For a given inductance, the relationship between frequency and reactance would be linear. What I wonder is what voltage and current are applied by the Sencore to achieve a reading for inductance and whether those unknown parameters could be causing an artifactually low reading for L.
On inductor test for value,I did measure 5vdc at the output leads before I hooked it to the choke to be tested.Once I hooked my voltmeter across the choke being tested,I measured no AC or DC voltage at all..
I did do a ringing test and they passed and I also did a 10% tolerance test and the chokes passed..I got 12 rings on each.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
For a given inductance, the relationship between frequency and reactance would be linear. What I wonder is what voltage and current are applied by the Sencore to achieve a reading for inductance and whether those unknown parameters could be causing an artifactually low reading for L.
What about the fact that the 320mh chokes read higher than the rated value? Either the chokes aren't consistent with their specified values or they are tested at a specified voltage and current or frequency to achieve their stated value.I can measure the voltage and current out of the sencore.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
If you don't apply DC current while making the measurement, the results won't be accurate. I raised this topic here on the forum sometime back. See the image above and the link below...
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