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Overview
The SDM8X50 is a 50 ohm, coaxial, 8:1 multiplexer used in a Campbell Scientific time-domain reflectometer system. It consists of a surge-protected multiplexer circuit board enclosed in a metal housing and a separate strain-relief bracket for the coaxial cables. Both the multiplexer housing and strain relief bracket have holes drilled at a 1 in. spacing. This enables you to mount the SDM8X50 to a wall or attach it to the backplate of a user-supplied enclosure or Campbell Scientific enclosure.
When you purchase the SDM8X50 with the –E option, a 10 x 12 x 4.5 in. environmental enclosure and enclosure supply kit are included. Other compatible Campbell Scientific enclosures that you may purchase separately include the ENCTDR100, ENC12/14, ENC14/16, and ENC16/18.
Benefits and Features
- 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
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Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Data Loggers
| Compatible | Note | |
|---|---|---|
| 21X (retired) | Although compatible with the SDM8X50, this data logger is not compatible with the TDR100. | |
| CR10 (retired) | Although compatible with the SDM8X50, this data logger is not compatible with the TDR100. | |
| CR1000 (retired) | ||
| CR1000X (retired) | ||
| CR10X (retired) | ||
| CR23X (retired) | ||
| CR3000 (retired) | ||
| 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.
Specifications
| 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) |
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FAQs for
Number of FAQs related to SDM8X50: 1
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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 data logger, that test does not work for the SDM8X50.