National Instruments PXIe-4081 PXI Digital Multimeter

The National Instruments PXIe-4081 (Part Number: 783130-01, 154888C-02L) is a 7½-Digit, ±1,000 V, Onboard 1.8 MS/s Isolated Digitizer PXI Digital Multimeter. The NI PXIe‑4081 is the industry’s most accurate 7½‑digit DMM, providing the measurement capabilities of a high-resolution 1,000 V DMM and an isolated digitizer—two common test instruments in one.

As a DMM, the PXIe‑4081 delivers fast, precise AC/DC voltage, AC/DC current, 2‑ or 4‑wire resistance, and frequency/period measurements, as well as diode testing. In the high-voltage, isolated digitizer mode, the NI PXIe‑4081 can acquire waveforms at sample rates up to 1.8 MS/s at the full input range of ±3 A or ±1,000 V. Additionally, the PXIe-4081 does not support direct inductance and capacitance measurements. For the isolated digitizer, the voltage ranges from ±100 mV to ±1,000 V (DC or AC coupled), the current ranges from ±1 µA to ±3 A, and the sample rate range is 10 S/s to 1.8 MS/s.

The National Instruments PXIe‑4081 Digital Multimeter has an input impedance of 10 MΩ ± 2% in parallel with 90 pF, and the maximum DC voltage component is 400 V. This DMM has a frequency range from 15 Hz to 500 kHz and a period measurement range from 2 µs to 66.67 ms. The PXIe-4081 does not have an ADC linearity specification of 0.5 ppm; instead, it provides ADC linearity of 0.5 ppm of reading + 0.5 ppm of range​

The PXIe‑4081 has a warm-up time of 60 minutes and requires calibration every 2 years. It has input protection up to 1,000 VDC or Vpk and a current mode fuse rating of T 3.5 A 1000 V, time-lag Minimum interrupt rating: 10 kA (Siba 5019906.3,5). The NI device is compatible with NI-DMM driver software and can be programmed using an application development environment such as LabVIEW or LabWindows/CVI. The device is configurable via Measurement & Automation Explorer (MAX).

The PXIe-4081 weighs 12 oz. and measures 8.5 × 5.1 × 0.8 in. (not 8.5 × 5.1 × 8.5 in.). It has a recommended operating temperature range of 0 °C to 55 °C and a storage temperature range of -40 °C to 71 °C.