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#26
December 21st 04, 04:40 PM
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"Dick" wrote in message
... My Tek 465 scope has developed a minor but annoying fault in its triggering circuitry but before diving into the guts of an old & faithful friend I would appreciate it if anyone who has experienced similar symptoms to those below could give me their thoughts on possible causes & (more importantly) how they fixed their particular version of the problem. 1) My scope just won't trigger in the A Normal mode although a stable trace obtained in A Auto will remain displayed (and stable) in A Normal until I touch either A Trigger slope or polarity controls. 2) I can stabilise a trace using the A Auto mode but only by adjusting the A Trigger Hold-off control rather than the A Trigger slope/polarity I would normally expect. 3) Everything appears to be triggering correctly when I use the B Trigger. 4) All other scope functions appear to be OK. I've checked these symptoms and they seem to be present what ever type of signal I'm inputting - sine/square, 1kHz - 1MHz, Ch1 or Ch2. I've got a set of battered circuit diagrams & layout drawings so should at least be able to follow up any ideas you experts might be able to pass my way. You need the Tekscopes group: Leon |
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