SDM8X50
SDM8X50
Limited availability8-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)
Common Accessories
(2)COAXTDR
TDR RG8 Multiplexer Cable with 2 BNC Plug Connectors
This low-loss coaxial cable connects different levels of SDM8X50s or connects the Level 1 SDM8X50 to the TDR100.
OrderableCABLE5CBL
5-Conductor 22 AWG Cable with Drain
This cable connects the datalogger to the SDM8X50. The CABLE5CBL-L is a 22 AWG, five-conductor cable with a Santoprene jacket and an aluminum Mylar shield.
Orderable
Replacement Parts
(7)8039
Ground Lug Connector, 8 AWG Max
The 8039 is a type L mechanical connector used for connecting a grounding wire to the SDM8X50. It is fastened in place with the 8673 #10-32 Nylock Nut.
Orderable8673
#10-32 Nylock Nut, Low Profile SS
The 8673 attaches the 8039 Ground Lug Connector to the SDM8X50.
Orderable505
Screw #6-32 x .375 Pan Phillips
These screws, along with the 6044 grommets, are commonly used together to secure our equipment to the backplates of our enclosures.
Orderable6044
Grommet for #6 or #8 Screw
These grommets are commonly used with the 505 screws to secure our equipment to the backplates of our enclosures.
Orderable2207
4 in. Nylon Cable Tie
The cable ties are constructed from a flexible, nylon material. A connection is made by pulling the tapered end through the locking end, thus forming a loop. The free end is pulled tight to secure the cables, then trimmed back to the locking end. Once attached, the cable tie must be cut to be removed.
Orderable28764
SDM8X50 Enclosure
The 28764 may be ordered to replace a damaged enclosure.
Orderable560
Screw #10-32 x .312 Pan Phillips
The 560 screw is used to attach a backplate to the inside of an enclosure.
Orderable
Compatibility
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.
Related Resources
Documents
- Manual
TDR200-Based Time-Domain Reflectometry System
August 2019
View Document - Manual
TDR100 Time Domain Reflectometry Systems
May 2015
View Document - Compliance
SDM8X50 UK Declaration of Conformity
View Document - Compliance
SDM8X50 EU Declaration of Conformity
View Document
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