User manual ART SYNCGEN

[. . . ] Grounding: Do not defeat the grounding and polarization means of the power supply. Moisture: To reduce the risk of fire or electrical shock do not expose the unit to moisture or use in damp or wet conditions. Do not place container of liquid on unit. Heat: Do not locate the unit close to excessive heat or direct sunlight, as this could cause a fire hazard. [. . . ] If the termination LED for the output you have connected lights Green, then you are done!If the Termination LED is Off, then the connection requires termination. Add a 75 Ohm terminator at the end of the cable run, either on the second wordclock input (Wordclock Thru) if available, or by adding a BNC "T" adaptor. A BNC "T" has two female ends (for cables) and one male end (to connect to a jack). You can buy these at RadioShack model #278-112. 3 If the Termination LED is RED, then there is an output-loading problem, and the output may be too low to function. Try removing the 75 Ohm terminator if you added one onto this output. If that is NOT the cause, then the output may be shorted. (A defective or improperly connected cable could cause this. ) If an output is unterminated or unused, the LED will not light. The SyncGen uses discrete 75 Ohm output drivers that adapt to the output load. Each output is protected from shorts and over-voltage due to accidental incorrect termination. Termination and why it is needed A terminator is simply a resistor connected between the signal and ground at the end of a cable. Termination reduces the reflections from the undriven end of a cable. These reflections can skew the timing of the waveform leading to timing errors. The longer the cable run, the worse the errors are that can be created. A green termination LED will indicate that a SyncGen output is correctly terminated. If you have too many terminators or a cable short, the LED will light red. This typically happens when you have a device with internal termination and you add a 75 Ohm terminator to the cable as well. An easy way to check for internal termination is to connect to the digital audio unit that you are unsure of, and check the termination LED. If it lights green, this device has internal termination. The SyncGen can also double as a handy BNC wordclock cable tester. First connect a cable; the termination LEDS should remain unlit indicating no short circuit. Next connect a 75 Ohm terminator using a BNC "T" adaptor. The termination LED should light green indicating a good connection. S/PDIF outputs Two coaxial S/PDIF outputs are provided to allow synchronization of digital audio devices that lack BNC wordclock inputs. [. . . ] 3) If you are returning the unit for service, pack the unit in its original carton or a reasonable substitute. The original packaging may not be suitable as a shipping carton, so consider putting the packaged unit in another box for shipping. Print the RA number clearly on the outside of the shipping box. 4) Include, with your unit, a note with the RA number and your contact information including a daytime phone number, preferably attached to the top of the unit. 7 Notes: 8 Specifications: Wordclock Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]