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dmx_basics:dmx_test_equipment [2013/03/12 22:03] (current)
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 +====== DMX Test Equipment. ====== 
 +\\ 
 +\\ 
 +Test equipment can be divided in two groups a simple where basics like cable connections and polarity are checked.\\ 
 +The other group is a bit more advanced where it is more an analyzer.\\ 
 +\\ 
 +The advanced testers can typically the basic tests of cable pin-out.\\ 
 +Additional they have signal level and timing analyze eventually with a trigger output for oscilloscope. ​ \\ 
 +But they also monitor channels, record and transmit DMX sequences.\\ 
 +Additional some has fixture predefined test pattern like dimmer, pan / tilt curves and so on.\\ 
 +\\ 
 +Most error comes from cables that are faulty and a simple cable tester will reveal most errors.\\ 
 +It is my opinion that for people that not hardcore each day build-up large rigs with many lights or maintaining many fixtures a simple cable tester will be sufficient.\\ 
 +A tester like the picture bellow is relative cheap but very useful.\\ 
 +\\ 
 +\\ 
 +{{:​dmx_basics:​dmx_palmer_cable_tester.jpg?​direct&​800|}}\\ 
 +\\ 
 +\\ 
 +A simple cable tester can be a DIY project.\\ 
 +Here is a suggestion of some circuits that can be handy to have in a tester.\\ 
 +\\ 
 +\\ 
 +\\ 
 +The first suggestion is a simple circuit that makes it possible, via a rotary switch, to see that all wires in the cable are ok and not broken or shorted.\\ 
 +\\ 
 +{{:​dmx_basics:​dmx_cable_tester.gif|}}\\ 
 +\\ 
 +Next a circuit that makes it possible to see if there are a DMX signal in the chain.\\ 
 +\\ 
 +{{:​dmx_basics:​dmx_signal_tester.gif|}}\\ 
 +\\ 
 +This sniffer circuit is just added so it is possible show the DMX signal here on the Wiki.\\ 
 +It is a circuit with two BNC connectors so it is possible to attach an oscilloscope to the lines.\\ 
 +Unfortunately is it too difficult to make a circuit that generates a trigger signal for a given DMX channel so this is not included under simple tester.\\ 
 +And it can be discussed if a serial resistor are to be added in two sniffer lines so an antenna effect are avoided.\\ 
 +See: [[dmx_basics:​dmx_measurements|]]\\ 
 +\\ 
 +{{:​dmx_basics:​dmx_oscilloscope_coupler.gif|}}\\ 
 +\\ 
 +\\ 
 +\\ 
 +And bellow is some pictures of how it can be realized.\\ 
 +\\ 
 +\\ 
 +\\ 
 +{{:​dmx_basics:​dmx_tester_top.jpg?​direct&​800|}}\\ 
 +\\ 
 +{{:​dmx_basics:​dmx_tester_side_2.jpg?​direct&​800|}}\\ 
 +\\ 
 +{{:​dmx_basics:​dmx_tester_side_1.jpg?​direct&​800|}}\\ 
 +\\ 
 +{{:​dmx_basics:​dmx_tester_open.jpg?​direct&​800|}}\\ 
 +\\ 
 +\\ 
 +\\ 
 +---- 
 +\\
dmx_basics/dmx_test_equipment.txt · Last modified: 2013/03/12 22:03 (external edit)