The Aeroflex / Tektronix / CDS 53A-331 Reed Relay Scanner Card is a ten-channel analog signal switching module engineered for automated test systems and data acquisition. Each channel employs a four-pole Form A dry reed relay, delivering low thermal offset and high isolation suitable for precision measurement and signal routing in laboratory and production environments.
Technical Specifications
Switching Architecture
• Ten individual four-pole Form A reed relays
• Four-wire analog signal acquisition per channel
• Four-line common output bus
• Switching rate: Up to 150 channels per second (random channel selection)
Contact and Load Ratings
• Maximum switching voltage: 200V DC
• Maximum switching current: 0.5 A
• Maximum resistive load: 10 W
• Initial contact resistance: <100 mΩ
• Contact resistance at end of reed life: <1 Ω
• Reed life expectancy: ≥10⁷ operations per channel at rated load
• Continuous duty cycle
Signal Integrity
• Differential thermal offset: <15 μV (at backplane analog output connector)
• Single-line thermal offset: 500 mΩ
• Signal path resistance at end of reed life: 10 GΩ
• Insulation resistance (closed channel, common bus to ground): 1 MΩ (with 1 MΩ resistors on front connector)
• Insulation resistance (open channel, any input to ground): >10 GΩ
– Key Features
• Built-in test equipment: Ten LEDs indicate closure status per corresponding channel
• Random channel selection via ASCII character commands from system controller
• Pluggable card cage module within CDS 53/63 Series Systems
– Compatibility & Integration
The 53A-331 integrates into CDS 53/63 Series card cages alongside other scanner modules, including the 53A-332 (twenty 2-wire channels) and 53A-336 (sixteen 2-wire high voltage channels). Multiple cards expand capacity within a single cage; multiple cages chain for system-level scaling. Optional OPT 20 backplane output isolation switch available. Recommended cables: 53A-721, 53A-780.
