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Ok, I'm using induction clamps on spark plug wires on ch1 ch2. After setting triggers, voltage and time base I get an illegible disastrous signature jumping all over then the scope screen freezes within 1 minute. I can change knob settings but cant move triggers until I remove the usb cable reinsert and restart the program. Ch1 signature is opposite(inverted) from 234 regardless of cable, all from the same internal signal generator. I have pictures but dont see an upload button here, please advise as my new $900 scope is useless for anything but a volt meter at this point. sony vaio windows 7 pro 64 sp1
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