The National Instruments 778275-01 is a sophisticated PCI Digital Multimeter Device integral to the PCI-4070 model series, designed to deliver comprehensive measurement capabilities essential for industrial applications. This device functions as both a high-resolution digital multimeter (DMM) and a digitizer, enabling precise and rapid measurements of voltage, current, frequency, diode testing, and AC/DC resistance across two or four wires. It operates with a range or function change speed of 100 measurements per second, making it highly efficient for dynamic measuring requirements. The auto-ranging feature offers timing of just 5 ms for both DC voltage and current measurements, along with 50 ms for resistance measurements, allowing users to swiftly transition between different measurement ranges.

In its high-voltage, isolated digitizer mode, the 778275-01 supports waveform acquisition at rates up to 1.8 MS/s, which is vital for capturing and analyzing dynamic signals within various systems and processes. The device maintains exceptional accuracy and reliability across various operating conditions, demonstrated by an effective common-mode rejection ratio (CMRR) exceeding 140 dB for DC measurements and significantly higher for high-frequency noise. It features a maximum 4-wire lead resistance limited to the lesser of 10% of the range or 1 kΩ, ensuring accurate readings. The negligible DC voltage input bias current, lower than 30 pA, minimizes interference during measurements.

For AC voltage and current, the device supports an auto-range time of 250 ms and a function change speed of 10/s while maintaining measurement capabilities at frequencies up to 60 Hz with a CMRR greater than 70 dB. Its variable resolution acquisition mechanism, ranging from 10 to 23 bits, provides flexibility to capture signals with varying degrees of detail across a voltage range of ±100 mV to ±300 V and current range of ±20 mA to ±1 A. Additionally, the 778275-01 features robust trigger characteristics that enhance measurement accuracy by reducing trigger jitter and delay while minimizing the need for external calibration equipment through its self-calibration options. This device is well-suited for applications requiring high precision and reliability.