NI PXI-6255 – High‑Channel‑Count Multifunction DAQ for dense PXI measurement systems

The NI PXI-6255 is a high-density M Series data acquisition module purpose-built for large channel-count voltage measurements in PXI test benches. From my experience, it’s a practical choice when you need to monitor dozens of points in parallel—production test racks, battery module monitoring, or multi-sensor R&D rigs—without stacking multiple smaller DAQs. You might notice that it balances channel density and sampling speed well for most mixed-signal test needs.

Order Placement Process and Guarantees

• – Warranty: 365 days (replacement or repair during the period)

• – Lead time: typically 1 week if in stock; no more than 1 month at the latest

• – Payment: 50% advance payment; full payment prior to delivery

– Shipping: FedEx, UPS, or DHL express; export documents provided on request

Key Features

• High-channel-count analog input – Typically up to 80 SE (or 40 DIFF) channels, ideal for dense sensor farms and multi-point voltage monitoring.
• 16-bit resolution, multiplexed ADC – A good balance of precision and speed for most lab and production test profiles.
• Sampling performance up to ~1.25 MS/s (single-channel) – Aggregate rate scales across channels; suitable for slow-to-mid bandwidth signals.
• Standard ±10 V input ranges – Works cleanly with common voltage output sensors and conditioned signals.
• PXI synchronization – Tight timing with PXI trigger lines and reference clocks for multi-module systems.
• Digital I/O and counters – In many cases, 24 bidirectional DIO lines and two 32-bit counters cover handshaking, timestamping, or simple encoder tasks.
• Flexible connectivity – High-density front connectors support shielded breakout accessories to keep wiring clean.
• Driver support – NI-DAQmx typically offers stable API access for LabVIEW, C/C++, Python, and .NET.

Technical Specifications

Related or Supporting Products

• NI PXI-6225 – Similar high-channel-count design at lower aggregate AI rates; a cost-effective option when bandwidth is modest.
• NI PXI-6259 – Fewer AI channels than PXI-6255 but higher per-channel versatility; good when you need more DIO and AO alongside AI.
• NI PXIe-6368 (X Series) – PXIe alternative with higher throughput and advanced timing; useful for future-proofing on PXIe chassis.
• SCB-68A / CB-68LP – 68-pin terminal blocks for convenient field wiring and sensor breakout.
• SHC68-68-EPM – Shielded 68-pin cable; from my experience it helps reduce crosstalk in dense racks.
• BNC-2110 / BNC-2120 – Breakout with BNC connectors if you prefer quick sensor swaps and clean coax terminations.

Installation & Maintenance

• Chassis & environment – Install in a 3U PXI chassis with adequate airflow; keep intake/exhaust paths clear. Typical ambient 0–55 °C.
• Wiring – Use shielded 68‑pin cables and grounded breakout accessories; route analog and digital bundles separately to minimize coupling.
• Grounding – Reference sensors correctly (SE vs DIFF). You might notice stability improvements with differential wiring in noisy plants.
• Triggering & sync – Leverage PXI trigger lines for multi-module starts; share reference clocks where tight phase alignment matters.
• Maintenance – Dust the chassis filters periodically; verify connectors are firmly latched. Calibration interval is typically 1 year for reliable accuracy.
• Software – Keep NI-DAQmx drivers current; firmware updates via NI MAX when available.
• Safety – Stay within specified voltage ranges; de-energize wiring before re-terminating. Use proper strain relief to protect the front connectors.

Quality & Certifications

• CE and RoHS compliant (typical for NI PXI M Series)
• UL/CSA safety assessed as applicable to the series and components
• Manufactured under ISO 9001 quality systems
• 365-day warranty coverage from shipment