Product Overview
The National Instruments PXI-4065 is a digital multimeter card for PXI systems. It provides 6.5 digit resolution for voltage, current, resistance, and diode measurement. The card is designed for automated test, calibration support, production verification, and laboratory measurement where precision and repeatability are required.
The PXI-4065 is part of the NI PXI instrument family. Because it is a PXI module, it can be synchronized with switches, signal generators, and other instruments in the same chassis. This integration supports test sequences that route signals, apply stimuli, and measure parameters in one application.
Precision Measurement Functions
The card measures DC and AC voltage, DC and AC current, two wire and four wire resistance, and diode voltage. The 6.5 digit resolution supports fine measurement steps for calibration work and for verifying devices with tight tolerances. Four wire resistance measurement removes lead resistance errors when testing low resistance devices and connections.
Multiple measurement ranges allow the card to cover small sensor signals as well as higher voltage and current levels. Low noise input circuitry and a stable internal reference support repeatable readings. The card supports self calibration and external calibration, which are important for maintaining measurement confidence over time.
Accuracy and Stability
The PXI-4065 is designed for stable and repeatable measurements. Its DC voltage accuracy supports demanding calibration and production test tasks. Careful thermal design and low noise input paths help maintain performance across the operating range. These characteristics matter when measuring low level signals or comparing devices with narrow limits.
Engineers should allow adequate warm up and settling time before critical measurements, especially when changing ranges. Calibration records should be maintained, and performance should be verified with known standards when the card is used for critical measurements.
PXI Integration and Timing
The PXI-4065 installs in a compatible PXI chassis and communicates with the controller over the PXI backplane. It can be synchronized with switches, signal generators, digitizers, and other PXI instruments through trigger lines and timing resources. This allows measurements to be coordinated with signal routing and stimulus application in a defined sequence.
The card is supported by NI-DMM driver software and can be programmed with LabVIEW, LabWindows/CVI, Measurement Studio, and other development environments. Engineers can configure measurement functions, ranges, and triggering through standard software tools.
System Design Considerations
Measurement quality depends on wiring, shielding, and grounding. Shielded cables and separation from power conductors help reduce noise pickup. For low level measurements, thermal voltages and cable effects can influence results, so engineers should allow settling time and verify performance under realistic conditions.
The card should be installed in a compatible chassis with adequate ventilation. Engineers should verify the power budget for the planned module mix and follow the chassis documentation for slot placement and thermal considerations. These steps help ensure reliable operation over the life of the system.
Typical Applications
Precision voltage, current, and resistance measurement
Calibration support and production verification
Semiconductor and electronic device characterization
Power supply and battery validation
Component and assembly test
PXI based automated test systems
The PXI-4065 provides 6.5 digit multimeter accuracy in a PXI module. Its measurement range, calibration features, and PXI integration make it a flexible instrument for precision automated test and measurement systems.
