According to Mike Watts, product manager-modular instruments at the company, "The PXIe-4081 7 1/2-digit DMM builds on the technology used in the PXI-4071 DMM, using a unique combination of off-the-shelf high-speed ADC technology and a custom-designed
sigma-delta converter to provide the noise, linearity, and speed performance required to achieve high-speed and high-precision measurements in a single instrument.
It accepts ICP[R] accelerometer and microphone inputs directly, simultaneously samples all channels at 51.2 kHz with a separate
Sigma-Delta converter for each input channel, and measures standard AC and DC voltages.