Fluke 98 Labscope

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From: adult dating
Date: 3/21/2007
Time: 6:14:25 PM
Remote Name: 66.228.125.110

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From: Harvey Chan
Date: 22 Feb 2002
Time: 02:05:28
Remote Name: 66.38.128.115

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Hi Fellow Techs, While doing some follow-up research today, I noticed a little anomaly with my labscope, a Fluke 98-II. I was scoping the crank/cam (sync) relationship on a Dodge Ram 1500 with a 5.2 litre V8.. I was dual tracing both signals and triggering with the cam sensor. This seemed to work fine when I had the scope set at 2 ms/div and 5 ms/div. However, when I set the scope to 10 ms/div, the scope would start to drop some of the crank signals. When I set the scope to 20 ms/div, the majority of the crank signals were dropped. Anything over 20 ms/div would result in no crank signals whatsoever, just a flatline at 0 volts. I got the same results whether I was triggering with r a positive or negative slope. Originally, I thought that this was due to slow sample speeds and that this was just a limitation of the scope. (Its good to know your tools limitations so that you don’t spend a lot of time chasing your tail <g>). However, the result of a search of a database netted me a posting of the same waveform made with another Fluke 98-II. This waveform had a timebase of 20 ms/div and I could see that there was no dropouts of the crank sensor signal. When my scope was set at 20 ms/div, approximately 75% of the crank signals was missing! Anyone have any ideas on this? Am I not setting my scope up properly? Could it be that my Fluke samples slower (mine is a version 1 converted to a version 2)? Anyone had any problems scoping high res signals, like on an Opti-Spark with the 98? Any insight or comments on this would be appreciated. Thanks in advance, Harvey Chan.