RETIRED ›
This product is not available for new orders.
SDM8X50 8-Channel 50 Ohm Coaxial Multiplexer for TDR Systems
Services Available

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

Images

Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
CR1000 (retired)
CR1000X (retired)
CR3000
CR6
CR800 (retired)
CR850 (retired)

Mounting Equipment

Product Compatible Note
ENC12/14
ENC14/16
ENC16/18
ENCTDR100

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)


Listed Under

Common Accessory for the following products:
This Product Replaced

FAQs for

Number of FAQs related to SDM8X50: 3

Expand AllCollapse All

Privacy Policy Update

We've updated our privacy policy.  Learn More

Cookie Consent

Update your cookie preferences.  Update Cookie Preferences