CompuServe Messages

Dan: When dealing with signals such as with video or logic, you need to synch the scope to something. In the case of logic, it is best to connect a probe between the external synch connector and the system clock. For video, try to find the horizontal synch or vertical synch, depending on what signals you are looking at, to the external synch. The reason for this is that although almost all signals are _supposed_ to be some particular frequency, all electronics drift off after a while. I've yet to see any electronic device exactly on frequency, even after I've tuned it! By locking the scope to some original source in the device, you are seeing the signals in relation to how the whole device is timing itself. BTW: In case you aren't aware of it, there is a position on the horizontal display width usually marked EXT. That is the position to use when synching to an external source. I hope this helps. "The first lesson of economics is scarcity…. The first lesson of politics is to disregard the first lesson of economics." (T. Sowell)