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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Aftermarket magneto slip rings
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<blockquote data-quote="Ken Targett" data-source="post: 46383" data-attributes="member: 521"><p>I think that specialised equipment is needed to test slip rings (and pick-ups), but I'm not sure that the 1000 Tohm meter mentioned above, or the 20 Gohm meter or 5 Tohm meters mentioned in the Britbike link, would be up to the job of detecting a failed component when one doesn't know in advance that it has failed. From what I gathered, those three instruments are measuring at 1 kV, 2.5 kV and 500 V, respectively, but sometimes failures are only apparent when the component is subjected to the higher voltages to which it is subjected in normal use. Also, testing at elevated temperature is sometimes needed to detect a failed component.</p><p></p><p>The instrument I use has a spark generator that produces a 50 Hz spark across a 3-point test gap usually set to 5.5 mm (so about 8 kV), and I compare the driving currents required by the spark generator to produce consistent sparks with and without the component connected in parallel with spark gap. A good component has a negligible effect on the required driving current. The extra current required is a good indication of how leaky the component is. The test is done not only with the component cold, but also at elevated temperature, usually 50 C. More information here for anybody interested <a href="http://brightsparkmagnetos.com/workshop/PickUpSlipRingTester/PickUpSlipRingTester.htm" target="_blank">http://brightsparkmagnetos.com/workshop/PickUpSlipRingTester/PickUpSlipRingTester.htm</a></p><p></p><p>Ken.</p></blockquote><p></p>
[QUOTE="Ken Targett, post: 46383, member: 521"] I think that specialised equipment is needed to test slip rings (and pick-ups), but I'm not sure that the 1000 Tohm meter mentioned above, or the 20 Gohm meter or 5 Tohm meters mentioned in the Britbike link, would be up to the job of detecting a failed component when one doesn't know in advance that it has failed. From what I gathered, those three instruments are measuring at 1 kV, 2.5 kV and 500 V, respectively, but sometimes failures are only apparent when the component is subjected to the higher voltages to which it is subjected in normal use. Also, testing at elevated temperature is sometimes needed to detect a failed component. The instrument I use has a spark generator that produces a 50 Hz spark across a 3-point test gap usually set to 5.5 mm (so about 8 kV), and I compare the driving currents required by the spark generator to produce consistent sparks with and without the component connected in parallel with spark gap. A good component has a negligible effect on the required driving current. The extra current required is a good indication of how leaky the component is. The test is done not only with the component cold, but also at elevated temperature, usually 50 C. More information here for anybody interested [URL]http://brightsparkmagnetos.com/workshop/PickUpSlipRingTester/PickUpSlipRingTester.htm[/URL] Ken. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Aftermarket magneto slip rings
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