National Instruments 783130-01 PXI Digital Multimeter

The National Instruments 783130-01 PXI Digital Multimeter, an identifying part number for the PXIe-4081 model, is an incredibly accurate 7½-digit DMM. It offers a complete measuring solution by combining the capabilities of an isolated digitizer with a high-resolution 1,000 V digital multimeter (DMM). It does accurate 2- or 4-wire resistance, frequency/period measurements, diode testing, and AC/DC voltage and current measurements as a DMM. It records waveforms at up to 1.8 MS/s in isolated digitizer mode.

With an ADC linearity of 0.5 ppm of reading and 0.5 ppm of range, the 783130-01 provides exceptionally precise DC voltage measurements. It has a high-order DC noise rejection of over 170 dB and an effective common-mode rejection ratio (CMRR) of over 140 dB (DC) with a 100 ms aperture. The device maintains a low DC voltage input bias current of less than 30 pA at 23°C and permits a minor overrange of up to 105% of the specified range, with the exception of 1000 V.

The DMM supports both AC and DC coupling and for AC voltage measurements, it has an input impedance of 10 MΩ ± 2% in parallel with 90 pF, on average. 2.2 x 10^7 V-Hz is the maximum Volt-Hertz product certified, and 400 V is the maximum DC voltage component; it can handle overrange conditions up to 105% of the range, with the exception of 700 V. With DC to 60 Hz, the CMRR is typically greater than 70 dB.

The 783130-01 device can handle overrange conditions up to 105% of the range for AC current measurements, with the exception of 3 A. In order to improve accuracy, 20 ppm of reading should be added to the 10VDC voltage parameters. The diode test functionality comprises a 10 V range with test currents of 1 µA, 10 µA, 100 µA, and 1 mA.

The voltage and current measurement ranges supported by the 783130-01's isolated digitizer function are ±100 mV to ±1000 V for voltage and 100 µA to 3 A for current. Its sample rate range is 10 S/s to 1.8 MS/s; available sample rates are determined by dividing the sample rate by y, which can be anywhere between 1 and 1.8 x 10^5. While the digitizer record length can be as little as two samples or as long as you want, the timebase accuracy equals the chassis's PXIe_CLK100 accuracy.