Product Overview
The National Instruments PXI-6133 is a multifunction data acquisition module for PXI systems. It belongs to the NI S Series family and provides eight analog input channels with 14 bit resolution and simultaneous sampling at up to 2.5 MS/s per channel. The module also includes analog output and digital I/O functions for mixed signal test.
The PXI-6133 is designed for applications where several signals must be captured at the same instant and with better amplitude resolution than typical 12 bit devices. It is used in power measurement, multi axis vibration and acoustic work, motor and inverter test, and other correlated multi channel applications.
Simultaneous Analog Input
All eight analog input channels sample at the same time, which preserves the phase relationship between signals. This is essential when computing power, phase angle, or transfer functions from multiple measured signals. Sequential sampling would introduce a timing offset that must be corrected mathematically, whereas simultaneous sampling avoids that error at the source.
The 14 bit resolution provides finer amplitude detail than 12 bit devices, which helps when measuring small signal components in the presence of larger ones. Selectable input ranges allow the module to be matched to the signal levels in the application. Engineers should apply good probing and grounding practice to preserve signal integrity at high sampling rates.
Analog Output and Digital I/O
The module includes analog output channels for generating control voltages, setpoints, and waveforms. Hardware timed output supports repeatable waveform generation, which is useful for stimulus response testing and control loop evaluation. Engineers should verify the load and settling requirements of the driven device.
Digital input and output lines provide logic level control and status monitoring. The module can use these lines for triggering, handshaking, or simple device control in a test sequence. The combination of analog and digital functions allows the module to handle mixed signal tasks in one PXI slot.
Timing and PXI Integration
NI-DAQmx provides trigger and clock configuration for the PXI-6133. Start triggers, reference triggers, and sample clocks allow acquisition to be aligned with external events. Within a PXI chassis, the module can share trigger lines and clocks with other instruments, enabling coordinated multi instrument test sequences.
Engineers should document the clock source and trigger routing so that the test sequence can be reproduced. For systems that require more channels, additional modules or devices can be synchronized where the architecture supports shared timing and triggering.
Software and Accessories
The PXI-6133 is supported by NI-DAQmx and can be programmed with LabVIEW, LabWindows/CVI, Measurement Studio, and other NI-DAQmx compatible environments. The driver handles channel configuration, scaling, calibration metadata, and task management. Signal conditioning accessories and shielded cables are available to connect signals to the module.
Installation requires a compatible PXI slot with adequate airflow and a chassis within the supported specifications. Cables should be routed away from power switching equipment, and shields should be terminated according to the accessory documentation. Regular verification of channel function and calibration supports long term measurement confidence.
Typical Applications
Power measurement with multiple voltage and current channels
Multi axis vibration and acoustic measurement
Motor and inverter test with correlated signals
Stimulus response testing of electronic circuits
Transient and fast multi channel signal capture
PXI based test and measurement systems
The PXI-6133 provides eight 14 bit simultaneous analog inputs at up to 2.5 MS/s, with analog output and digital I/O in an S Series PXI module. Its correlated multi channel capability makes it suitable for power, motor, and dynamic signal applications.
