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FMS Forum • View topic - FMS Forum - Parallelport-PPM-Interface

FMS Forum - Parallelport-PPM-Interface

Postby Rainer » Mon Apr 02, 2001 4:50 pm

Hallo FMS - Freunde.
Auch ohne Ozzilloskope ist eine Signalerfassung am Sender möglich. Voraussetzung ist ein Multi-Messgerät mit einem hochohmigen akustischen Durchgangsprüfer. Die Hochohmigkeit ist absolut notwendig, um die empfinliche Elektronik des Senders beim Messen nicht zu beschädigen. Mit Hilfe solcher Messgeräte können alle L/S- und DSC-Buchsen und HF-Modulanschlussbeinchen durchgemessen werden. Zu beachten ist noch, dass die schwarze Messleitung (COM) nicht die Masse für das Signal erfasst, sondern das Signal selbst und die rote Messleitung die Signal-Masse.
Diese leicht irretierende Gegebenheit ist darauf zurückzuführen, dass der akustische Durchgangspüfer auch zum Messen von Dioden genutzt werden kann und der Messeingang mit einer Schutzbeschaltung ausgestattet ist.
Wenn das Signal richtig erfasst ist, ist ein unterbrochener Ton zu hören. Die Tonlage des Tones ändert sich, wenn die Knüppel bewegt werden.
Die Beschaltung für das Interface kann entsprechend nach den Angaben im FMS-Handbuch durchgeführt werden.

Rainer

(Edited by Rainer at 11:30 pm on April 17, 2001)
Rainer
 
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Joined: Mon Apr 02, 2001 4:21 pm

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