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NI SCXI-1125 | 16-Bit DAQ Signal Conditioning Module

NI SCXI-1125 | 16-Bit DAQ Signal Conditioning Module

Original price was: $999.00.Current price is: $888.00.

  • Model: SCXI-1125
  • Brand: National Instruments
  • Series: SCXI Modular I/O
  • Core Function: Conditions and isolates eight differential analog voltage signals for E/M Series DAQ devices with programmable gain and filter settings.
  • Category: Analog Input Conditioning Module
  • Key Specs: 8 differential channels, 12 programmable gains (1–2000), 4 Hz or 10 kHz low-pass filter, 300 Vrms isolation per channel, –40 °C to +70 °C
  • Availability & Condition: New surplus, ready to ship
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Category: SKU: SCXI-1125 Tags: Brand:
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Description

3. Key Technical Specifications

  • Number of channels: 8 differential
  • Input range: ±2.5 mV to ±5 V DC (or peak AC)
  • Programmable gain: 1, 2, 5, 10, 20, 50, 100, 200, 250, 500, 1000, 2000
  • Filter: 4 Hz or 10 kHz low-pass (3-pole Butterworth)
  • Isolation: 300 Vrms working per channel (channel-to-channel and channel-to-earth)
  • Input impedance: >1 GΩ || 100 pF (normal), 4.5 MΩ (off)
  • Input bias current: ±100 pA typical
  • CMRR: 160 dB (4 Hz), 98 dB (10 kHz) at 50/60 Hz
  • Scan interval accuracy: ±0.012% (3 µs), ±0.006% (10 µs)
  • Slew rate: 0.1 V/µs min
  • Operating temperature: –40 °C to +70 °C
  • Power consumption: +18.5 V: 140 mA max, –18.5 V: 140 mA max, +5 V: 10 mA max
  • Dimensions: 3.1 cm x 17.3 cm x 20.3 cm
  • Weight: 641 g
  • Connector: 32-pin DIN C front, 50-pin rear ribbon

4. Product Introduction (Anti-Template)

When a main CPU trips and downtime costs thousands per minute, the last thing you need is an unresponsive input card. The NI SCXI-1125 slots right into SCXI racks as an 8-channel isolated voltage input module built for exactly those precision signals. It handles millivolt to 5 V ranges with 300 Vrms isolation and programmable gain down to 2000x while the filter rejects noise cleanly.

Honestly, this design choice saves hours of rewiring when you stay inside the same SCXI family. The jumperless setup and onboard EEPROM for calibration keep everything rock-steady, while the status LEDs give technicians an instant visual check without opening a laptop.

5. QC, Procurement & Logistics SOP

  1. Inbound Verification: Origin tracing against NI part labeling, OEM seal and date-code inspection, visual check for bent pins or damaged connectors.
  2. Live Rig Testing: Power-on self-test in a compatible rack, verification of all eight channels under load, confirmation of response timing and protocol validation.
  3. QA & Anti-Static Packaging: Final functional sign-off, conformal inspection, sealed in anti-static bags with desiccant and foam support.
  4. Global Logistics & Export Compliance: Optimized HS code classification for industrial electronic modules, double-boxed with shock indicators, documented for air or sea freight to minimize customs holds.

6. Technical Pitfalls & Integration Warnings

Firmware or system revision mismatch can drop communication. Picture a plant running an older DAQ device that expects a specific protocol handshake—swap in a later lot and the inputs stay dark until the backplane firmware is aligned.

DIP switch or address configuration errors are classic. A technician sets the wrong base address, the module powers up with LEDs, yet the PLC never sees the points; hours later the root cause is a single switch that should have been left at factory default.

Wiring or terminal incompatibility bites hard. Source or sink wiring mistakes happen when people forget to match the field device polarity; the channel reads zero or flickers randomly.

ESD during unboxing still kills modules. Dry winter air, no wrist strap, a quick touch on the edge connector, and one channel fails intermittent weeks later. Always ground before handling.

7. Frequently Asked Questions (FAQ)

How long does global shipping usually take once the unit clears QA? Most regions see 3–7 business days by air after export docs are complete. Sea freight stretches that to 3–5 weeks depending on port congestion—customs clearance in the EU might add 2 days.

What shipping and customs options do you support? We handle air freight for urgency and sea for bulk. All shipments carry optimized HS classification and full commercial invoice so clearance stays predictable.

Can I hot-swap the SCXI-1125 while the rack is live? Not recommended. Removing or inserting under power risks backplane arcing and can take out adjacent modules. Power down the I/O base first.

Is the SCXI-1125 backward-compatible with older NI racks? In most cases yes within the same family, provided voltage, commons, and addressing match. Always confirm the exact backplane revision and firmware before the swap.

What happens if the load exceeds 0.5 A on one channel? The overcurrent and thermal protection kick in. The channel shuts down until the fault clears and the module cools; repeated overloads can permanently degrade that output.

Do you supply the terminal blocks or just the module? Module only unless specified. Match the original terminal style or use the NI-compatible blocks rated for the current.

Any special storage or handling notes before installation? Keep in original anti-static packaging until ready. Avoid condensation; bring the unit to ambient temperature before powering up in a humid plant.

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