dmx_basics:dmx_test_equipment
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| + | ====== DMX Test Equipment. ====== | ||
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| + | 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.\\ | ||
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| + | 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.\\ | ||
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| + | 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.\\ | ||
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| + | 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.\\ | ||
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| + | 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.\\ | ||
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| + | Next a circuit that makes it possible to see if there are a DMX signal in the chain.\\ | ||
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| + | 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: | ||
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| + | And bellow is some pictures of how it can be realized.\\ | ||
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dmx_basics/dmx_test_equipment.txt · Last modified: 2013/03/12 22:03 by 127.0.0.1