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Customer
Comentado en los Estados Unidos el 11 de julio de 2024
product met my expectations
SeaBass
Comentado en los Estados Unidos el 22 de junio de 2024
Providing my test data would be more helpful than a fluffy review, so here goes:REFER TO DIAGRAM:1. Meter used for Testing: Fluke 101 set on one KiloOhm Scale2. Test Scenario: Connect each Terminator to a Spare NMEA 2000 T-BUS, and an additional drop cable was used to allow connection of the female terminator (The cable is not shown in the diagram)3. Connect a custom NMEA 2000 to 8 Pin Bblock cable to a drop position on the bus4. Measure Ohms with both Terminators in place (Normal Terminated Circuit)5. Measure Ohms with One Terminators in-place (abnormal unterminated Circuit)TEST RESULTS:1. With both Terminators in place, the reading was 60 Ohms +/- 1 Ohm; this validates that both terminators are correctly balancing the backbone impedance per the NMEA 2000 standard2. Each Terminator was removed one at a time and re-measured. The resistance increased to 120 Ohms, +/1 Ohm, with each test. This indicates that each terminator's native impedance (120 Ohms) is correct.TEST APPLICATION NOTES:1. A NMEA 2000 backbone should only have two terminators on each end of the circuit2. The normal backbone impedance is 60 Ohms, and the terminators are wired in parallel on the bus; according to Ohms law, resistors (terminators) in parallel drop in impedance to roughly half; therefore, the two 120 Ohm devices result in a net backbone impedance of 60 Ohms.3. The unterminated test verified that the bus reverted to an abnormal 120 OhmsDIY: If you want to perform this test, you can do it with a standard multimeter. Although my custom cable makes testing more accessible, a standard drop cable can be used. Connect the multimeter leads to pins 4 and 5 of the drop cable, set the meter range to a low Ohms scale or auto, and take the reading. A reading of 120 Ohms reflects an abnormal unterminated bus; 60 Ohms is typical, and less than 60 Ohms indicates that too many terminators have been connected.I recommend this product with 5 Stars: It meets the electrical specifications of the NMEA 2000 marine standard, and the pins appear to be solid brass. I did not test for IP67, but the connectors do have sealing washers and watertight, self-sealing shrouds.I hope my review, data, and tips help. Happy Sailing or Boating!
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