Überblick
Der SDM8X50 ist ein 50 Ohm8:1 Koaxialmultiplexer zur Verwendung in einem TDR100-basierten System. Er besteht aus einem überspannungsgeschützten Multiplexerboard in einem Metallgehäuse und einer seperaten Klemme zur Zugentlastung der Koaxialkabel. Klemme und Multiplexer haben im Abstand von 1 inch Löcher zur Befestigung an der Rückwand eines Gehäuses.
In der -E Ausführung ist ein 10 x 12 x 4.5 inch Gehäuse inklusive. Die Gehäuse ENCTDR100, ENC12/14, ENC14/16 und ENC16/18 können auch verwendet werden.
Funktionen und Vorteile
- Longer lasting relays; 20 times more operations than SDMX50 relays
- Non-latching relays provide better surge protection
- Hermetically sealed relays are more stable and do not become coated with a non-conducting film
- Quiet operation
Bilder
Spezifikationen
| Operating Temperature Range | -40° to +55°C |
| Multiplexer Housing Dimensions | 24.9 x 12.2 x 4.6 cm (9.8 x 4.8 x 1.8 in.) with mounts |
| Strain Relief Bracket Dimensions | 20.3 x 4.3 x 1.3 cm (8.0 x 1.7 x 0.5 in.) |
| Multiplexer Weight | 590 g (1.3 lb) |
Power Requirements |
|
| Input Power | 12 Vdc |
| Quiescent Current Drain | < 1 mA |
| Current Drain during Switching | ~ 90 mA (All multiplexers of the same level switch simultaneously for less than 1 s.) |
| Relay Contact Life Expectancy | 100 x 106 operations (at 5 V and 10 mA) |
Enclosure (-E option) |
|
| Outside Dimensions | 40.4 x 29.2 x 17.5 cm 15.9 x 11.5 x 6.9 in.) with mounts |
| Inside Dimensions | 25.4 x 30.4 x 11.4 cm (10 x 12 x 4.5 in.) |
| Weight | 4.1 kg (9.0 lb) |
Kompatibel mit
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Datenlogger
| Product | Compatible | Note |
|---|---|---|
| CR1000 (retired) | ||
| CR1000X | ||
| CR3000 | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) |
Additional Compatibility Information
Enclosure Considerations
When purchased with the –E option, a 10 x 12 x 4.5 in. environmental enclosure and enclosure supply kit are included with the SDM8X50.
FAQs für
Number of FAQs related to SDM8X50: 3
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The hermetically sealed relays used in the SDM8X50 are much quieter than the relays used with the retired SDMX50-series multiplexers. Although listening for the clicking on the SDMX50-series multiplexers was a common method to verify that the multiplexer was powered and communicating with the datalogger, that test does not work for the SDM8X50.
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The SDM8X50 is the same as the SDMX50SP in form, fit, and function. When purchased with the –E enclosure option, a 10 x 12 in. environmental enclosure is included, making it functionally the same as the SDMX50. There is no comparable replacement for the SDMX50LP, which was the multiplexer and backplate used with the SDMX50 but sold separately for installation in a user-supplied enclosure.
The primary difference between the SDM8X50 and the SDMX50-series multiplexers is the electromechanical relays. The SDMX50-series products used latching relays with an expected lifespan of 5 x 106 operations. Because these relays were always latched, there was always an electrical pathway back to the TDR100 and an increased risk of damage from an electrical surge. The SDM8X50 uses non-latching, hermetically sealed relays with a lifespan of 100 x 106 operations. Additionally, relays have been added to the ground channels to electrically isolate them from each other and reduce interference. Thus, the SDM8X50 has improved surge protection, quieter operation, and a longer lifespan than the SDMX50-series multiplexers.
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The PC-TDR software is compatible with the SDM8X50 multiplexer, but the non-latching relays may cause issues. When PC-TDR (version 2.08 and lower) advances to a multiplexer terminal, it sends one command to the multiplexer. With the older SDMX50-series multiplexers, one command was sufficient because the relays latched. The non-latching relays on the SDM8X50 release 30 seconds after the command is sent, which results in a loss of connection between the sensor on that terminal and the TDR100. To latch again for a good reading, it is necessary to manually force PC-TDR to go to a different SDM8X50 terminal and then back to the terminal of interest. The continuous waveform function should not be used with the SDM8X50. These known issues will be addressed in the next version of the PC-TDR software.