Part Code Definition

PXI = PCI Extensions for Instrumentation bus standard

4351 = fixed model series for 24-bit precision thermometry & low-level signal acquisition

Technical Specifications

Channel Configuration: 16 differential /32 single-ended multiplexed analog input, shared single 24-bit Σ-Δ ADC, non-simultaneous sampling

ADC Resolution: 24-bit effective, equivalent ~5.5 digital multimeter digits

Max Scan Rate: 1.25kS/s total aggregate scan rate, per-channel max ~78S/s under full 16DI channel setup

Programmable Input Ranges: ±50mV/±100mV/±200mV/±500mV/±1V/±2V/±5V/±10V; input impedance＞10GΩ for voltage input

Onboard Function: integrated CJC cold junction compensation (CJC precision ±0.5℃), programmable isolated bridge excitation:2.5V/5V/10V; built-in anti-aliasing analog filter + configurable digital filter

Isolation Rating: channel-to-chassis ground isolation 250VAC continuous, suppress ground loop interference

Operating Environment: 0~50℃ operational, -20~70℃ storage, RH 5%~95% non-condensing

Power Consumption: typical 7.8W via PXI backplane 5V supply

Interface & Communication Configuration

Front Connector: shielded 68-pin latch-type D-SUB, match NI TB-4351 screw terminal accessory block for field sensor wiring

Backplane Bus: standard PXI peripheral slot, access PXI trigger bus and 10MHz system clock for multi-card synchronized scanning measurement

Driver & Software: fully supported by NI-DAQmx, compatible with LabVIEW, LabWindows/CVI, TestStand; self-calibration via software without hardware adjustment

Core Functions

1.Multi-type temperature acquisition: thermocouple(J/K/T/E/R/S/B/N), 2/4-wire RTD, thermistor with onboard CJC eliminating external cold junction accessory

2.Low DC voltage micro-signal precision measurement for transducer output, mV-level sensor signal

3.Programmable excitation source for strain gauge, load cell, resistive bridge transducer measurement

4.Software-configurable digital filter to eliminate power frequency 50/60Hz noise for stable long-term data logging

5.Sync with PXI relay switch modules to expand multi-channel distributed temperature test system

Application Scenarios

Aerospace component thermal cycling test, automotive powertrain temperature mapping, industrial furnace multi-point temperature monitoring, battery pack thermal characteristic test, laboratory environmental chamber data logging, legacy PXI temperature test bench spare replacement

Operation & Maintenance Notes

Use shielded twisted pair cable for thermocouple wiring to reduce thermal EMF error; preheat module 30min before high-precision temperature testing; avoid overvoltage exceeding rated input range on analog terminals; clean 68pin connector regularly to prevent contact resistance drift; chassis ventilation unblocked to keep stable working temperature.