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What is TTL trigger output in the rear panel for DSC8104A
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on Aug 26, 2008
on Sep 12, 2008 by ko2054
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I use DSC8104A series scope, I want to output a sigal to other device when scope trigger in a case, how can I use this output? Or where can I find the documents explaining this function about TTL trigger output?
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Sep 12, 2008 2:12 PM
The TTL trigger output on the rear panel is used to trigger other devices. Every time the scope triggers, there is a TTL compatible output pulse on the BNC connector. I suggest you use the triggered mode or single mode. The auto trigger mode can get you in trouble with slow rep rate signals. In the auto trigger mode, the scope generates its own trigger about every 20ms in case a real signal was not present to trigger the scope. With fast rep rate signals you will not see any difference using the different trigger modes. But with slow rep rate signals, the 20ms timer might cause a trigger to occur before your real signal had a chance to trigger the scope. If you use the triggered or single modes, the scope will wait until your real signal actually causes a trigger to occur. The auto trigger mode is great to see if the scope is even seeing a signal. Auto scale can also help you find signals. The help menu and the specifications in the help menu briefly describe the TTL trigger output.
In the upper left hand corner of the Utility/calibration menu, there is a small box labeled Aux Out. You can choose to set this box to several choices like Cal signal, demo signal, 10MHz reference, or trig out. If you select trig out, the AUX out BNC on the rear panel will also have a pulse every time the scope triggers. This is not a TTL signal, but it can still be used to trigger other devices. Again, you can refer to the help menu or specifications in the help menu for details.
Incidently, using any of the two trigger output ports is a great way to find out what the scope update rate under specific conditions. By measuring the frequency of the trigger output, you get an idea of the scope update rate under the measurement conditions you are using. Scope manufactures put their best foot forward when they list the update rate of the scope under the specifications. You will find the update rate listed is for specific conditions. It is probable that your specific measurement setup might be very different from that listed in the specifications so you might like to have an idea of the update rate using your setup conditions.
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