PXI module operates as full-feature DMM and 1,8 MSa/s isolated digitiser

9 October 2002 Test & Measurement

National Instruments claims that engineers can dramatically reduce the time it takes to make accurate measurements with its new 61/2-digit digital multimeter (DMM) in a single-slot 3U PXI module. The PXI-4070 FlexDMM - a full-featured DMM delivers the accuracy of a 61/2-digit DMM along with advanced features. It can deliver 6 parts per million basic 24-hour DC voltage accuracy and sub µV sensitivity. The FlexDMM offers a continuously variable DC reading rate from 100 Sa/s at 61/2 digits to 5 kSa/s at 41/2 digits.

The FlexDMM's design incorporates a 1,8 MSa/s isolated digitiser. In isolated digitiser mode, it can acquire both AC and DC-coupled waveforms up to ±300 V input, at a maximum sample rate of 1,8 MSa/s. By combining NI LabVIEW software with the isolated digitiser mode, the FlexDMM can analyse transients, flyback signals, or other nonrepetitive high-voltage AC waveforms in both the time and frequency domain.

The manufacturer says that the PXI-4070 achieves unprecedented AC measurement speeds by solving a traditionally analog problem of RMS-to-DC conversion in the digital domain. It uses a digital algorithm that automatically rejects the DC component of the signal, making it possible to offer a DC-coupled AC voltage mode that completely bypasses the slow-settling input coupling capacitor required with traditional methods. With this digital approach, FlexDMM achieves AC measurement reading rates up to 2 kSa/s. It also inherently improves system integration because the PXI platform combines the high-speed PCI bus with integrated timing and triggering to deliver a more than 10X performance improvement compared to older architectures.

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