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Adopting a high-speed PXI bus architecture, this product delivers a measurement speed at least five times faster than that of traditional GPIB-controlled multimeters. It supports flexible resolution adjustment from 10 to 26 bits and boasts an ultra-wide measurement dynamic range. Additionally, it is equipped with features including built-in self-calibration, high common-mode isolation, and seamless integration with switch modules. Eliminating the need for additional data acquisition and signal conditioning equipment, it significantly reduces the overall system cost, serving as a high-performance testing solution for fields such as electronic testing, new energy detection, and semiconductor device testing.
related documents
NI PXI-4071 Datsheet.pdf
NI PXI-4071.pdf
Core Measurement Performance and Technical Parameters
The NI PXI-4071 offers DC voltage measurement ranging from ±10 nV to 1000 V, with an AC RMS maximum of 700 V (1000 V peak) and a DC voltage sensitivity of 10 nV. Its current measurement covers a DC range of ±1 pA to 3 A and an AC RMS maximum of 3 A (4.2 A peak), boasting an ultra-low DC current sensitivity of 1 pA. An innovative solid-state current shunt configuration enables accurate detection of ultra-micro currents. For resistance measurement, it spans from 10 µΩ to 5 GΩ, supporting 4-wire and 2-wire measurement modes with a sensitivity of 10 µΩ, meeting full-scenario measurement needs from microohm-level low resistance to gigaohm-level high resistance.
In terms of measurement speed, in DMM mode, the module delivers a DC reading rate of 7 S/s at 7½-digit resolution, 100 S/s at 6½-digit, 3 kS/s at 5½-digit, and up to 10 kS/s at 4½-digit resolution. In digitizer mode, it achieves a maximum sampling rate of 1.8 MS/s, which is supported across all voltage and current modes, enabling DC-coupled waveform acquisition. The sampling rate and resolution are flexibly matched, with the resolution adjustable from 10 to 23 bits according to the sampling rate, meeting measurement requirements of varying precision and speed. Meanwhile, the product supports frequency/period and diode testing functions. Diode testing uses a 10 V range with a resolution of 10 µV and provides multi-gear test currents of 1 µA, 10 µA, 100 µA and 1 mA, suitable for characteristic detection of PN junctions, LEDs and Zener diodes.
High-Speed Digitizer and AC Measurement Characteristics
As a 1.8 MS/s isolated digitizer, the NI PXI-4071 supports waveform acquisition across all voltage and current ranges. The acquired DC-coupled waveforms can be subjected to time-domain and frequency-domain analysis via LabVIEW software, enabling accurate capture of aperiodic high-voltage AC waveforms such as transient and flyback signals—a unique feature among 7½-digit multimeters of the same type. In digitizer mode, it features a minimum record length of 8.89 µs, a maximum record length of 149 s, a time base accuracy of 25 ppm, a trigger delay of 3.6 µs and a trigger jitter of less than 600 ns. The current acquisition range covers 100 µA to 3 A, and voltage acquisition delivers excellent bandwidth and distortion performance across different ranges—for example, a 340 kHz -3 dB bandwidth at the 100 mV range and a THD of -108 dB for 1 kHz signals.
For AC measurement, the product adopts a digital-domain RMS conversion algorithm that eliminates the need for analog conversion, significantly increasing AC measurement speed. The algorithm is insensitive to crest factor and outputs stable, low-noise measurement results, with an AC accuracy guaranteed to 1% of the full scale—far superior to the 10% specification of traditional multimeters—and usable readings can even be obtained at below 0.1% of the full scale. At 6½-digit resolution, the AC reading rate is adjustable from 0.25 S/s to 100 S/s, corresponding to a bandwidth of 1 Hz to 300 kHz; at 5½-digit resolution, the reading rate reaches 1 kS/s with a bandwidth of 20 kHz to 300 kHz. The AC voltage range covers 50 mV to 700 V RMS, and the AC current range covers 100 µA to 3 A RMS. All AC speed specifications are valid with auto-zero disabled.
Calibration and Accuracy Assurance
The NI PXI-4071 features built-in gain and offset self-calibration—a characteristic exclusive to traditional high-end multimeters. Leveraging a high-precision, high-stability internal voltage reference, self-calibration corrects DC gain and offset drift inside the multimeter, and compensates for drift in resistors and current sources simultaneously. Its internal high-stability foil resistors offer an ultra-low temperature coefficient of just 0.8 ppm/°C over the entire operating temperature range, and all errors in resistance measurement can be calibrated to this reference resistor. Requiring no external calibration equipment and completing in less than 1 minute, self-calibration enables the product to maintain high precision and stability even outside the traditional temperature range of 18–28 °C. With a precision circuit design based on self-calibration, the product has an external calibration cycle of up to 2 years, significantly reducing calibration and maintenance costs.
All calibrations of the product comply with NIST-traceable standards. With 7½-digit resolution, auto-zero and ADC calibration enabled, the DC voltage accuracy delivers excellent specifications across different ranges. For example, the 10 V range offers a 24-hour accuracy of 2 ppm of reading + 0.5 ppm of range, a 90-day accuracy of 12 ppm of reading + 0.5 ppm of range, and a 2-year accuracy of 15 ppm of reading + 0.5 ppm of range. At 6½-digit resolution, the DC current accuracy for the 1 µA range is 25 ppm of reading + 20 ppm of range over 24 hours, and 15 ppm of reading + 30 ppm of range over 24 hours for the 3 A range. Additionally, the product provides noise error compensation: the noise level can be adjusted via integration time and range multiplier across different ranges and resolutions, with the peak-to-peak noise being 6 times the RMS noise, further ensuring measurement accuracy.
System Integration and Hardware & Software Compatibility
The NI PXI-4071 boasts exceptional system integration capability, supporting trigger signal input and output, and enabling seamless integration with various multiplexer/matrix switch modules. It is particularly compatible with NI switch products such as the NI PXI-2530 multiplexer and NI SCXI-1129 high-density matrix. Paired with the NI Switch Executive switch management software, it can implement measurements across thousands of channels and support signal acquisition from a variety of sensors including voltage transducers, thermocouples, RTDs and thermistors, effectively controlling system costs while expanding measurement channels. The product’s triggering is LVTTL/TTL-compatible, with a minimum input trigger pulse width of 1 µs (for cables shorter than 2 m) and a measurement-complete trigger pulse width of 3 µs. The maximum trigger rate is 6 kHz in DC mode and 1 kHz in AC mode, with a trigger delay as low as 2 µs, meeting the requirements for high-speed synchronous measurements.
In terms of hardware protection and electrical characteristics, the product supports a 500 V common-mode voltage. The DC common-mode rejection ratio (CMRR) exceeds 140 dB at a 100 ms aperture and over 170 dB above 46 Hz, while the normal-mode rejection ratio (NMRR) is greater than 100 dB for noise sources above 46 Hz, effectively suppressing interference signals. The input terminals are made of gold-plated, low-thermoelectric potential solid copper to reduce measurement errors caused by contact potential, with a typical DC voltage input bias current of less than 30 pA at 23 °C. Overrange protection is set to 105% of the full scale (except for the 1000 V and 3 A ranges). The current input is equipped with a replaceable 3 A/250 V fast-blow fuse, and 2-wire resistance measurement supports a maximum input protection of 1000 VDC, meeting safety requirements for high-voltage measurements.
On the software side, the product is compatible with Windows Vista/XP/2000 and Linux operating systems. NI test software such as LabVIEW, LabVIEW Real-Time Module, LabWindows/CVI, Measurement Studio and LabVIEW SignalExpress is recommended for use. The NI-DMM driver, LabVIEW Express VIs and DMM Soft Front Panel (SFP) are included with the product. As an IVI-compatible driver, NI-DMM provides a wealth of example programs and easy-to-use API interfaces, supporting interactive configuration and real-time preview of measurement results. The Soft Front Panel enables convenient testing of input signals and system debugging. The driver is optimized for mainstream NI software and Microsoft Visual Studio .NET, greatly reducing development difficulty.
Physical and Environmental Specifications
The NI PXI-4071 is a 3U single-slot PXI/CompactPCI module with dimensions of 2.0×13.0×21.6 cm (0.8×5.1×8.5 inches) and a weight of only 314 g (11 oz). It has a power consumption of less than 8 W and is powered by the PXI backplane with no need for an external power supply. Its compact design makes it ideal for integration into various PXI test systems. The product operates in a temperature range of 0 to 55 °C, with a maximum relative humidity of 80% at 35 °C, and a storage temperature range of -40 to 70 °C. It meets Measurement Category I (up to 1000 V) and Pollution Degree 2 requirements, adapting to the complex environmental demands of industrial sites and laboratories. The rated accuracy is achieved after a 1-hour warm-up period upon power-on.
For safety and compliance, the product adheres to electrical safety standards including IEC 61010-1, EN 61010-1, UL 61010-1 and CSA 61010-1. It complies with electromagnetic compatibility standards such as EN 61326 (immunity), EN 55011 (emissions, Group 1 Class A), CE, C-Tick, ICES and FCC Part 15 (emissions, Class A). It also meets the EU Low Voltage Directive 2006/95/EC and Electromagnetic Compatibility Directive 2004/108/EC, and users in the EU can recycle the product in accordance with the WEEE Directive.
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