The SDM8X50 is a new 50 ohm, coaxial, 8:1 multiplexer for TDR100-based systems that has replaced the SDMX50-series coaxial multiplexers. The main improvement over the SDMX50 series is hermetically-sealed, non-latching mechanical relays for both the ground and signal lines of each multiplexer channel and on the lines shared internally by multiple channels.
Benefits of these relays are:
- Quieter operation
- No oxidation buildup—Oxidation can cause erroneous TDR readings.
- Longer lasting—Specified for 100 x 106 operations, these relays provide 20 times more operations than provided by the SDMX50-series relays.
- Better surge protection—Relays unlatch 30 s after receiving a channel advance command so that electrical surges are less likely to have an electrical pathway back into the TDR100 and damage the TDR100’s input diodes.