SDM8X50
SDM8X50
Orderable8-Channel 50 Ohm Coaxial Multiplexer for TDR Systems
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.
Key Advantages
Benefits
- 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
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)
