Product Overview
The National Instruments NI 9215 with BNC is a four channel analog input module for CompactDAQ and CompactRIO systems. It provides 16 bit resolution, plus or minus 10 V input range, and simultaneous sampling at up to 100 kS/s per channel. The BNC version offers shielded coaxial connections for convenient and low noise signal connection.
The NI 9215 is part of the NI C Series platform, which offers modular signal conditioning for data acquisition and control. The module is used in general purpose voltage measurement, sensor monitoring, dynamic signal capture, and multi channel test applications where channel to channel timing matters.
Simultaneous Sampling
The NI 9215 samples all four input channels at the same time. Simultaneous sampling preserves the timing relationship between channels, which is important when comparing phase, measuring power, or analyzing correlated signals. When channels share a common sample clock edge, relative timing between signals remains accurate.
This architecture is useful in motor test, power measurement, vibration analysis, and multi sensor monitoring. Engineers can correlate voltage, current, and sensor signals without correcting for channel skew introduced by sequential scanning. The module supports hardware timed acquisition and triggering for repeatable measurements.
Analog Input Performance
The NI 9215 provides 16 bit resolution and a plus or minus 10 V input range. The resolution supports measurement of small signal changes in a wide range of applications. The module includes input protection and signal conditioning to help maintain measurement quality in industrial and laboratory environments.
Engineers can configure input ranges, sampling rates, and triggering through NI-DAQmx software. The module is intended for voltage signals within its specified input limits and should be protected from overvoltage in the test setup. Proper grounding and cable routing help reduce noise pickup.
BNC Connectivity
The BNC version of the NI 9215 provides shielded coaxial connections for each analog input. BNC connectors are common in laboratory instruments, sensors, and signal sources, and they support quick connection with good shielding. This is useful when the module is used with signal generators, voltage probes, and sensor conditioners that provide BNC outputs.
Shielded coaxial cable helps reduce electromagnetic interference, which is important in high resolution analog measurement. Engineers should use quality cables and confirm that signal grounds are compatible with the module input architecture. Careful cable routing away from power wiring further improves measurement accuracy.
Software and System Integration
The NI 9215 is supported by NI-DAQmx driver software. It can be programmed with LabVIEW, LabWindows/CVI, Measurement Studio, and other NI-DAQmx compatible development environments. Engineers can configure channels, sampling rates, input ranges, and triggering through standard software tools. The module can also use TEDS with compatible sensors to simplify identification and setup.
In a CompactDAQ system, the NI 9215 is used for portable and bench top voltage measurement. In a CompactRIO system, it can be part of an embedded monitoring system that acquires sensor signals and processes them in real time. The module supports synchronization with other C Series modules so voltage data can be correlated with current, temperature, strain, and digital signals.
Typical Applications
Multi channel simultaneous voltage measurement
Power and motor test with correlated channels
Sensor monitoring and laboratory measurement
Dynamic signal capture with BNC connections
CompactDAQ and CompactRIO data acquisition
Test benches requiring channel to channel timing accuracy
The NI 9215 with BNC provides four 16 bit simultaneous sampling analog input channels with plus or minus 10 V range. Its BNC connectivity and C Series integration make it a practical module for multi channel voltage measurement applications.
