This subject has been beat to death, but I am not here to beat a dead horse. We all know this mod is not necessary for a lot of us, and that some have had good luck with it as well as some have had bad luck with it.
However, in the good name of science and engineering, I have an idea that may shed some light on the "goodness" of aftermarket COPs versus the stock ones.
Using a good DVM (digital volt-ohm-milliamp meter), you should be able to measure the internal resistance of the primary and, if you like, the secondary side. We call this value Rint.
One terminal on top of the COP will be a common ground for both the primary and secondary sides. I would guess you can look at the wiring schematic for the feed to the COPs and determine which wire/terminal is ground.
Use the DVM in resistance mode to measure the internal resistance of the primary and secondary sides. Be sure to not touch the terminals while you make this measurement to ensure you don't put a resistance in parallel with the primary or secondary side.
Measure the aftermarket ones versus the stock ones.
Now this is what I would expect to see if the aftermarket ones are stronger than the stock ones: The internal resistance of the aftermarket ones should be LOWER than the stock ones. This will most likely mean they are using a larger diameter wire (lower gauge number) for more current flow.
Now if the measurement shows that Rint is HIGHER, then that tells me they are using more windings with a similar or smaller wire, which is BAD.
Now if I had some of the equipment I had in college/grad school (decade resistor boxes, variable capacitors, and a signal generator), I could actually use an AC sine wave input to measure the inductance of the COP and do that comparison as well. Lower Rint and more inductance (L) would definitely make a better COP.
Hope this helps with this issue.
Mike
However, in the good name of science and engineering, I have an idea that may shed some light on the "goodness" of aftermarket COPs versus the stock ones.
Using a good DVM (digital volt-ohm-milliamp meter), you should be able to measure the internal resistance of the primary and, if you like, the secondary side. We call this value Rint.
One terminal on top of the COP will be a common ground for both the primary and secondary sides. I would guess you can look at the wiring schematic for the feed to the COPs and determine which wire/terminal is ground.
Use the DVM in resistance mode to measure the internal resistance of the primary and secondary sides. Be sure to not touch the terminals while you make this measurement to ensure you don't put a resistance in parallel with the primary or secondary side.
Measure the aftermarket ones versus the stock ones.
Now this is what I would expect to see if the aftermarket ones are stronger than the stock ones: The internal resistance of the aftermarket ones should be LOWER than the stock ones. This will most likely mean they are using a larger diameter wire (lower gauge number) for more current flow.
Now if the measurement shows that Rint is HIGHER, then that tells me they are using more windings with a similar or smaller wire, which is BAD.
Now if I had some of the equipment I had in college/grad school (decade resistor boxes, variable capacitors, and a signal generator), I could actually use an AC sine wave input to measure the inductance of the COP and do that comparison as well. Lower Rint and more inductance (L) would definitely make a better COP.
Hope this helps with this issue.
Mike
and then get some sleep.
