Description
NI SCXI-1141 – Multi‑Channel Lowpass Filter Module for Clean, Reliable Signal Conditioning
The NI SCXI-1141 is a multi-channel analog lowpass filter module designed for the SCXI signal conditioning platform. From my experience, it’s a go-to when you need to remove high-frequency noise before your DAQ board samples the signal. You get tidy, repeatable waveforms and far fewer aliasing headaches—especially when you’re dealing with sensors, audio/acoustics, or general R&D benches where the incoming signal isn’t always friendly.
You might notice that labs keep the SCXI-1141 in service for years. That’s because it typically offers per‑channel filtering, stable frequency response, and straightforward integration with NI-DAQ. It sits in the chassis, does the cleanup quietly, and feeds your acquisition device exactly what it needs. One thing I appreciate is how it reduces the wiring and rework around external filters—less patching and fewer error points.
Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery time: typically 1 week for in‑stock items; no more than one month at the latest
- Payment: 50% advance payment, full payment before delivery
- Express delivery options: FedEx, UPS, DHL
Key Features
- Multi‑channel lowpass filtering – Typically 8 channels of analog filtering for simultaneous sensor lines, improving SNR before digitization.
- Programmable cutoff frequency – Configure cutoff via NI‑DAQ/SCXI control to match your sampling rate and measurement bandwidth.
- Anti‑aliasing front end – Conditions signals so your downstream DAQ card captures clean, representative data.
- Backplane integration – Outputs filtered signals to the SCXI backplane, reducing external wiring and simplifying routing.
- High input impedance and low noise – Helps preserve sensor integrity and reduces loading in many cases.
- Broad use cases – Vibration prefiltering, audio/acoustic testing, power electronics noise suppression, and mixed‑signal R&D setups.
- SCXI ecosystem compatibility – Works with SCXI chassis and host interfaces (PCI/PXI/USB) controlled via NI‑DAQ.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand / Model | NI SCXI-1141 |
| HS Code (suggested) | 9031.80 (Measuring or checking instruments, other) |
| Power Requirements | Powered via SCXI chassis backplane; no external supply required |
| Operating Temperature | 0 to 50 °C (typical for SCXI modules) |
| Signal I/O Types | Analog inputs (multi‑channel) with filtered analog outputs routed to SCXI backplane |
| Communication / Control | Configured through NI‑DAQ via SCXI chassis; host interfaces typically PCI, PXI, or USB |
| Installation Method | 1‑slot plug‑in module for SCXI chassis (e.g., SCXI‑1000 / SCXI‑1001 / SCXI‑1000DC) with front terminal block |
Related or Supporting Products
- SCXI‑1142 / SCXI‑1143 – Similar multi‑channel lowpass filter modules with different filter characteristics and ranges; useful if you need a particular response shape or cutoff span.
- SCXI‑1000 / SCXI‑1001 / SCXI‑1000DC – Chassis options depending on slot count and power environment.
- SCXI‑1600 – USB interface module for direct PC connectivity without a separate DAQ board.
- Terminal blocks (e.g., SCXI‑1300 or SCXI‑132x series) – Choose based on your wiring style and shielding requirements.
- Modern alternatives: PXIe‑4464 or cDAQ modules (e.g., NI‑9234/9232) when transitioning from legacy SCXI to current platforms with integrated anti‑aliasing and streamlined setup.
Installation & Maintenance
- Cabinet & chassis environment – Mount the SCXI‑1141 in a clean, ventilated SCXI chassis. Maintain airflow around the chassis; avoid heat sources.
- Wiring & shielding – Use twisted, shielded pairs for low‑level signals. Terminate shields at a single point to minimize ground loops.
- Power‑off handling – Insert or remove the module only with chassis power off. Observe ESD precautions during installation.
- Filter setup – Set cutoff frequencies to at least 2–5× lower than your anti‑aliasing requirements relative to the sample rate; verify with a quick frequency sweep if possible.
- Routine care – Annual calibration is typically recommended in lab environments. Check screw terminals for tightness, clean dust from vents, and keep NI‑DAQ drivers/firmware up to date.
- Troubleshooting tip – If channels look attenuated unexpectedly, confirm the programmed cutoff, gain path, and the backplane routing selection in NI‑DAQ.
Quality & Certifications
- Certifications: CE; UL; RoHS compliance may vary by production year and region.
- Manufacturer quality system: typically aligned with ISO standards for electronic test equipment.
- Warranty: supplied with a 365‑day warranty from us.
Quick note from customers: teams replacing bulky external filters reported faster bring‑up and more stable baselines after moving to SCXI‑1141. It seems to be a small change that saves time each time you switch test profiles.
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