NI SCXI-1120D Isolated Signal Conditioning Module for Precision Analog Measurements

The NI SCXI-1120D is a dependable SCXI-series isolated signal conditioning module designed to clean up and scale low-level sensor signals before they hit your DAQ device. From my experience, it’s the kind of module teams pick when they need stable, low-noise measurements and prefer to set gain and filtering right at the front end. You might notice that the “1120D” variant is tuned for dynamic, general-purpose analog inputs—ideal for vibration probes, transducers, or instrumentation signals where isolation and per-channel filtering typically pay off with cleaner data.

One thing I appreciate is how it slots into a standard SCXI chassis and quietly handles the “hard part”: isolation, amplification, and low-pass filtering—so your downstream NI DAQ (PCI/PXI/USB) gets conditioned, ready-to-digitize signals. In many cases this reduces wiring headaches, ground loops, and random noise that eats into your resolution.

Order Placement Process and Guarantees

• Warranty: 365 days
• Lead time: 1 week if in stock; no more than one month at the latest
• Payment terms: 50% advance payment, full payment before delivery
• Express options: FedEx, UPS, DHL

From my side, we typically confirm availability the same day, share a proforma for the deposit, and lock the shipping window immediately after. It keeps schedules predictable, especially if you’re coordinating multiple racks.

Key Features

• Isolated analog inputs – Channel-to-ground isolation helps cut ground loops and improves safety on mixed-signal benches.
• Programmable gain and filtering – Scale low-level signals and apply low-pass filters at the front end for cleaner, more repeatable measurements.
• Tight SCXI integration – Conditions signals right in the chassis and routes them to your NI DAQ via the SCXI backplane. Cabling stays simple.
• Multi-sensor flexibility – Suits general analog instrumentation signals; commonly used with transducers, voltage-output sensors, and dynamic probes.
• Stable, low-noise design – In many cases you’ll see reduced noise floor and fewer artifacts compared to direct-to-DAQ wiring.
• Service-friendly front connectivity – Works with SCXI terminal blocks for neat wiring, strain relief, and maintenance access.

A test engineer who recently swapped these into an older SCXI rack mentioned they saw steadier baselines and less drift during long thermal runs—no change to the DAQ card, just better front-end conditioning.

Technical Specifications

Related or Supporting Products

• NI SCXI-1120 – Same family signal-conditioning module; variant without the “D” option. Suitable when a standard configuration is sufficient.
• NI SCXI-1121 – Universal isolated sensor input (fewer channels per module); handy when you need per-channel flexibility for bridges or thermocouples.
• NI SCXI-1102 – Thermocouple-focused module with high channel density, if temperature is your primary measurement.
• NI SCXI-1000 / SCXI-1001 – 4‑slot and 12‑slot chassis to host the SCXI-1120D and other modules.
• NI SCXI-1600 – USB SCXI controller for direct PC connection; a quick way to add SCXI to a laptop bench.
• SCXI Terminal Blocks (e.g., SCXI-1320/1321/1327) – Front wiring accessories with strain relief; pick based on connector style and shielding needs.

If you’re replacing an older 1120-series unit, we can typically match the terminal block and wiring style one-to-one, so changeover stays minimal.

Installation & Maintenance

• Cabinet & chassis – Mount in an NI SCXI chassis with adequate front/rear clearance. Provide ventilation; avoid heat sources and strong EMI fields.
• Wiring – Use shielded twisted pairs for low-level signals. Land wires on the appropriate SCXI terminal block, keep grounds consistent, and separate power from signal runs.
• Safety – De-energize wiring before changes. Respect channel isolation limits and sensor common-mode voltages.
• Grounding – Star-ground the system where practical; isolation helps, but good grounding practices usually improve noise margins.
• Calibration – Perform a system calibration annually (module + DAQ). Re-verify gains and filter settings after any hardware change.
• Cleaning – Light dusting only; avoid solvents. Keep terminal blocks free of debris to maintain insulation resistance.
• Firmware/Drivers – While the module is passive from a firmware standpoint, keep NI-DAQmx on the host up to date for the best SCXI support.

Quality & Certifications

• Certifications – Typically CE and RoHS compliant; built under ISO 9001 quality systems.
• Manufacturer’s warranty – Backed by a 365‑day warranty period from us; extended service options available on request.
• Tested modules – Units are function-checked prior to shipment, which, in many cases, shortens your commissioning time on site.

If you share your sensor types and expected signal ranges, I can recommend the right terminal block and help predefine the gain/filter settings so your first measurements look good right away.