Channel & Wiring Configuration

• 32 independent differential relay channels, expandable to matrix topology via terminal blocks
• Four user-selectable wiring modes: 1-wire, 2-wire differential, 3-wire, 4-wire
• Supports both sequential multiplexed scanning and random non-sequential switching
• Rear 96-pin shielded DIN connector for direct terminal block mating
• Built-in isolated +5 VDC power output for terminal block cold junction sensors

Relay Switching Ratings

• Max continuous differential/single-ended voltage: 300 VDC / 300 Vrms
• DC switching capacity: 1 A @ 30 VDC, max 30 W single-channel power
• AC switching capacity: 200 mA @ 250 Vrms, max 60 VA single-channel power
• Initial contact on-resistance: ≤100 mΩ, gold-clad silver alloy contacts

Bandwidth & Crosstalk Parameters

• Max signal bandwidth (50 Ω termination): 11 MHz (-3dB)
• Channel crosstalk @10 kHz: ≤-70 dB; @1 MHz: ≤-53.3 dB; @11 MHz: ≤-27.2 dB
• Differential thermal EMF: <3 µV, negligible for millivolt-level signals
• Recommended warm-up time: 5 minutes for stable thermal drift performance

Dynamic Timing Specifications

• Max switching cycle speed: 100 channel operations per second
• Relay operate time: 3 ms typical, 5 ms maximum at 20℃
• Relay release time: 1.5 ms typical, 5 ms maximum at 20℃
• Min external trigger input pulse width: 500 ns for synchronous scanning

Key Electrical Specifications

• Channel-to-channel/channel-to-ground isolation: 300 Vrms continuous withstand
• Transient surge protection: 1000 V peak surge per IEC industrial standards
• Mechanical lifespan (no-load): 5×10⁷ switching cycles
• Electrical lifespan (full load): 2×10⁵ switching cycles
• Power consumption: 3.8 W typical operating power
• EMC compliance: FCC Class A, CE certified for industrial indoor use

Mechanical & Environmental Specifications

• Dimension: 172×86×32 mm, standard single-slot SCXI module
• Operating temperature: 0℃ ~ +50℃
• Storage temperature: -20℃ ~ +70℃
• Humidity: 10%–90% non-condensing, max altitude 2000 m
• Safety rating: IEC 61010-1, UL 3111-1, Pollution Degree 2

Compatibility Matching List

• Matched terminal blocks: SCXI-1331 (multiplexer), SCXI-1332 (matrix topology)
• Compatible chassis: SCXI-1000, SCXI-1001
• Compatible controllers: SCXI-1600, PCI/PXI SCXI bus adapters, NI-DMM devices
• Official status: Obsolete, only aftermarket replacement supply available

Software Compatibility

• Drivers: NI-SWITCH, NI-DAQmx, Traditional NI-DAQ
• Configuration tools: NI MAX, NI Switch Executive
• Supported software: LabVIEW, LabWindows/CVI, Python DAQmx, C#

Pros & Limitations

• Pros: 300 V high isolation rating, multi-mode circuit compatibility, wide bandwidth, ultra-low thermal offset, dual multiplexer/matrix functions, long mechanical service life
• Limitations: Slow switching speed vs solid-state relays, obsolete lifecycle, no onboard signal filtering, limited AC current switching capacity