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National Instruments 779181-01 PXI Multifunction I/O Module

The part number 779181-01 from National Instruments is the identifying part number for the PXI-6123 PXI Multifunction I/O Module. This versatile module is equipped with 8 analog input channels that have a 16-bit analog-to-digital converter for converting the input analog signals into digital signals for digital signal processing. The 16-bit resolution allows the input signal to be broken down into 65000 levels when converted into digital for higher accuracy and more detailed signal capture. The module has a maximum sampling rate per channel of 500 kilo-samples per second allowing the module to quickly scan the input signals. The analog input signals have a voltage range of ±10 V allowing both sensitive and high-level signals to be processed.

The 779181-01 PXI Multifunction I/O Module has an input impedance of 100 MΩ with a 10 pF capacitor in the parallel to help maintain the original signal form and prevent noise and ensure minimal loading on the signal source. To protect the voltage from overvoltage protection this module has an overvoltage protection of up to ±36 Volts. The biasing current at the input of the module is ±2 pA nominal while the maximum biasing current is at ±25 pA to maintain accuracy by minimizing offset errors. This module has integral nonlinearity of ±2 least significant bit at maximum and differential nonlinearity ranging from -1 least significant bit to +1.5 least significant bit. To make sure the module is accurate the user can determine its gain error, offset error value, and noise uncertainty. 

The 779181-01 features 8 digital I/O channels which are compatible with the TTL/CMOS logic levels. The Digital I/O channels are user-programmable and can be programmed to be set as input or output depending on the application it is used in. To provide clock signals and perform timing-related tasks the Multifunction I/O Module features two 24-bit counter/timers and a 4-bit frequency scaler. This module has two base clocks for the timer, the 20 MHz and the 100 MHz with an accuracy of ±0.01%.

The 779181-01 supports both analog and digital triggering, enhancing its versatility in data acquisition applications. The analog trigger can be sourced from any of the analog input channels and is programmable with an 8-bit resolution. The digital trigger is compatible with TTL logic and responds to rising or falling edges with a minimum pulse width of 10 ns. The module also integrates seamlessly with the PXI trigger bus, providing 7 trigger lines and a 1-star trigger for coordinated measurements across multiple devices.