DIY Inductance bridge - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

GMB · 21st May 2021, 8:59 am

I was thinking that maybe there is an ultra-thin crack in the wire of a winding that creates bizarre effects. Using electronic meters in "funny" situations can give misleading results, just as you keep describing.

Refugee · 21st May 2021, 2:28 pm

I reckon the high inductance has a long enough time constant that the meter range switches before it has settled. The inductance needs to be pretty high for this to happen.
The signal generator may well have gone as low as 10hz and that would need to remain constant amplitude so again indicating an expected high inductance.
You have almost certainly got the correct value for it.

21st May 2021, 8:59 am	#21
GMB Dekatron Join Date: Aug 2003 Location: near Reading (and sometimes Torquay) Posts: 3,094	Re: DIY Inductance bridge I was thinking that maybe there is an ultra-thin crack in the wire of a winding that creates bizarre effects. Using electronic meters in "funny" situations can give misleading results, just as you keep describing.

21st May 2021, 2:28 pm	#22
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,553	Re: DIY Inductance bridge I reckon the high inductance has a long enough time constant that the meter range switches before it has settled. The inductance needs to be pretty high for this to happen. The signal generator may well have gone as low as 10hz and that would need to remain constant amplitude so again indicating an expected high inductance. You have almost certainly got the correct value for it.