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COP testing
Anybody know how to test cops? I did some interweb searching and mt searching and have not come up with anything helpful. Can somebody impart some resistance values I should see (mainly thinking the resistance across the driver will be most important/helpful and I think it should be around 5k). Thanks!
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1: Put the ignition coil on the bench.
2: Have a source of 12 volts available, such as a car battery. A wall-wart probably won't cut it unless it's rated for well over 1000ma (1A), and more is better here. 3: Insert a spark plug into the coil. 4: Take a length of wire, strip one end several inches, and wrap that end around the threaded portion of the spark plug, securing it with tape, zip-tie, etc. Connect the other end of the wire to the GND or (-) side of the 12v power supply. 5: Connect the (+) and (-) terminals of the coil to the 12v power supply. 6a: When I've done this, I have had a second power supply available to supply 5v to the trigger input. This one can be a small wall-wart, or one of those battery holders that puts 3 AA batteries in series. i: If you have this available, connect the (-) or GND side of the 5v supply to that of the 12v supply. 6b: If you do not have a 5v supply available, you can probably get away with triggering via 12v:ii: Tap the (+) wire of the 5v supply to the trigger pin of the coil very briefly, and the plug should spark. i: Install a 1k resistor in series with a piece of wire. ii: Connect one end to the (+) terminal of the 12v supply, and tap the other to the COP's trigger terminal. iii: I don't guarantee that this will work / not destroy your coil. |
I just did resistance checks across all of my cops and they were all within 1% of each other. These are the values I got:
+12 to Gnd. 27KΩ Gnd. to Trigger 346.5Ω Gnd. to Tach. 0Ω +12 to Tach. 485.8KΩ +12 to Trigger 27.2KΩ |
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