PXIe-4302 32-Channel Simultaneous Analog Input Module
The PXIe-4302 is a 32-channel, 24-bit PXI Express analog input module designed for accurate voltage, thermocouple and current measurements. It combines simultaneous sampling, programmable input ranges and selectable digital filters for multichannel data acquisition systems.
Each channel has a dedicated delta-sigma ADC and supports sampling rates up to 5 kS/s per channel. This architecture allows all 32 channels to acquire signals simultaneously without the channel-to-channel delay associated with multiplexed measurement devices.
Key Features of the PXIe-4302
- 32 differential analog input channels
- 24-bit analog input resolution
- Simultaneous sampling on every channel
- 5 kS/s maximum sampling rate per channel
- ±10 V and ±100 mV nominal input ranges
- Dedicated delta-sigma ADC for each channel
- Selectable digital filter for individual channels
- 2 Hz, 20 Hz, 200 Hz, 1 kHz and 2 kHz filter settings
- Up to four concurrent sample-rate and trigger configurations
- Support for voltage, thermocouple and current measurements
- DMA and programmed I/O data transfers
- NI-DAQmx driver support
PXIe-4302 Technical Specifications
| Product Model | PXIe-4302 |
|---|---|
| Part Number | 783865-01 |
| Product Type | PXI Express Simultaneous Filtered Analog Input Module |
| Analog Input Channels | 32 differential |
| ADC Resolution | 24 bit |
| ADC Type | Delta-sigma |
| Sampling Mode | Simultaneous |
| Sample-Rate Range | 1 S/s to 5 kS/s per channel |
| Nominal Input Ranges | ±100 mV and ±10 V |
| Input Coupling | DC |
| Input Impedance | Greater than 1 GΩ |
| Digital Filter Settings | 2 Hz, 20 Hz, 200 Hz, 1 kHz and 2 kHz |
| Concurrent Timing Engines | Up to 4 |
| Fault Protection | 30 V between analog input terminals |
| FIFO Buffer | 1,023 samples |
| Data Transfers | DMA and programmed I/O |
| Front Connection | 96-pin DIN |
| Bus Type | PXI Express |
| Operating Temperature | 0°C to 55°C |
PXIe-4302 Part Number and Accessories
| Item | Part Number | Description |
|---|---|---|
| PXIe-4302 | 783865-01 | 32-channel, 24-bit, 5 kS/s simultaneous analog input module |
| TB-4302 | 783869-01 | Front-mount terminal block for voltage and thermocouple inputs |
| TB-4302C | 783871-01 | Front-mount terminal block for current input measurements |
| RM-4302 | 783872-01 | Rack-mount terminal block with in-situ calibration support |
| SH96-96-2 | 157350-03 | 3 m cable for connecting the module to a rack-mount terminal block |
| SH96-96-2 | 157350-05 | 5 m cable for connecting the module to a rack-mount terminal block |
The TB-4302 and TB-4302C mount directly on the front of the module. The RM-4302 requires a compatible SH96-96-2 cable and is intended for rack-mounted systems where signal connections must remain accessible.
32-Channel Simultaneous Sampling
The PXIe-4302 has one dedicated ADC for each of its 32 differential analog input channels. All channels can therefore acquire signals at the same instant at rates up to 5 kS/s per channel.
Simultaneous sampling preserves the phase and timing relationships between channels, making the module suitable for multichannel sensor measurements, structural testing and synchronized process monitoring.
24-Bit Measurement Resolution
The module uses 24-bit delta-sigma ADCs to provide high-resolution measurements of slowly changing and low-frequency signals. Its high resolution is particularly useful for thermocouples, precision voltage measurements and low-level sensor outputs.
The combination of 24-bit conversion, differential inputs and selectable filtering helps reduce the effect of noise in demanding measurement environments.
Programmable Input Ranges
The PXIe-4302 provides nominal input ranges of ±100 mV and ±10 V. The ±100 mV range is suitable for low-level sensors and thermocouples, while the ±10 V range supports common industrial and laboratory voltage signals.
Selecting the range closest to the expected signal amplitude helps maximize the effective measurement resolution.
Per-Channel Digital Filtering
A digital low-pass filter can be selected independently for each channel. Available cutoff settings include 2 Hz, 20 Hz, 200 Hz, 1 kHz and 2 kHz.
This allows channels measuring slowly changing temperature signals to use stronger filtering while other channels acquire faster voltage or current signals at higher bandwidths.
Four Concurrent Timing Configurations
The PXIe-4302 can operate with up to four different sample-rate and triggering configurations at the same time. Channels can be grouped according to their sensor type, bandwidth and measurement requirements.
This capability reduces the need to operate every channel at the same rate and helps optimize data volume when different sensor types are connected to one module.
Voltage Measurements
When used with the TB-4302 terminal block, the module can acquire up to 32 differential voltage signals. The ±10 V range supports common test and industrial signals, while the ±100 mV range provides additional sensitivity for low-level measurements.
Differential measurements help reject common-mode noise and reduce errors caused by ground-potential differences.
Thermocouple Measurements
The PXIe-4302 can be used for high-density thermocouple acquisition when paired with appropriate terminal hardware and cold-junction compensation. Its ±100 mV range, 24-bit resolution and low-frequency filters are well suited to thermocouple signals.
Thermocouple type, scaling, cold-junction compensation and open-sensor detection should be configured correctly in the measurement software.
Current Measurements
The TB-4302C terminal block enables current measurements with the PXIe-4302 by converting the input current into a measurable voltage. It is intended for applications involving common industrial current signals.
Verify the terminal block configuration, current range and external wiring before connecting a current loop.
Typical Applications
- Multichannel voltage acquisition
- Thermocouple temperature measurement
- Industrial current-loop monitoring
- Structural and mechanical testing
- Battery and energy-storage testing
- Automotive validation
- Environmental test chambers
- Process monitoring
- Power system measurement
- Automated data logging
NI-DAQmx Software Support
The PXIe-4302 is supported by the NI-DAQmx driver, which provides configuration, timing, triggering, scaling and data-transfer functions. Applications can be developed using LabVIEW, Python, C, C# and other supported programming environments.
NI-DAQmx also provides example programs and diagnostic tools to simplify module setup and troubleshooting.
FlexLogger Integration
FlexLogger can be used to configure and record measurements without developing a complete custom application. Users can set channel names, engineering units, sample rates, alarms and logging conditions through an interactive interface.
It is particularly useful for validation, environmental testing and multichannel sensor data-logging applications.
Terminal Block Selection
Choose the TB-4302 for front-mounted voltage or thermocouple wiring. Choose the TB-4302C when current inputs are required.
The RM-4302 is designed for rack-mounted installations and supports front-panel signal access, external power input and in-situ calibration while the PXI module remains installed.
PXI Express System Integration
The PXIe-4302 requires a compatible PXI Express chassis and controller. System configuration should consider the number of modules, chassis cooling, synchronization, controller performance and total data throughput.
Visit the NI PXI Modules category to explore related measurement and data acquisition hardware.
Troubleshooting the PXIe-4302
The module is not detected
Confirm that the PXIe-4302 is installed in a compatible PXI Express slot. Check the chassis controller, PXI Platform Services and NI-DAQmx installation.
Measurements contain excessive noise
Use differential wiring, verify the signal ground, select an appropriate digital filter and keep sensor cables separated from power and switching signals.
The measured voltage is incorrect
Check the selected input range, terminal assignments, signal polarity and engineering-unit scaling. Confirm that the input does not exceed the supported working voltage.
Thermocouple temperatures are inaccurate
Verify the thermocouple type, polarity, cold-junction compensation source and terminal block configuration. Avoid creating additional junctions with incompatible metals.
Current measurements are incorrect
Confirm that the TB-4302C is used and configured correctly. Check the current-loop wiring, channel assignment and scaling applied in NI-DAQmx.
Some channels sample at an unexpected rate
Review the channel grouping and timing-engine configuration. The PXIe-4302 supports up to four concurrent sample rates, so channels may belong to different acquisition groups.
PXIe-4302 Comparison
| Model | Channels | Resolution | Maximum Rate | Primary Use |
|---|---|---|---|---|
| PXIe-4302 | 32 | 24 bit | 5 kS/s per channel | High-density filtered sensor acquisition |
| PXIe-4303 | 32 | 24 bit | 51.2 kS/s per channel | Higher-bandwidth simultaneous acquisition |
| PXIe-4300 | 8 | 16 bit | 250 kS/s per channel | Isolated high-voltage measurements |
| PXIe-4339 | 8 | 24 bit | 25.6 kS/s per channel | Bridge and strain measurements |
Recommended Related Products
- PXIe-4303 – 32-channel simultaneous analog input module with a higher 51.2 kS/s sampling rate
- PXIe-4300 – 8-channel isolated analog input module for measurements up to 300 V
- PXIe-4339 – 24-bit bridge input module for strain, load and pressure measurements
- PXIe-4357 – high-density thermocouple input module for temperature measurement
- PXIe-1092 – PXI Express chassis for modular measurement systems
Selecting the PXIe-4302
Choose the PXIe-4302 when the application requires high-density, high-resolution acquisition of voltage, thermocouple or current signals with simultaneous sampling and flexible per-channel filtering.
If a higher sampling rate is required, consider the PXIe-4303. If channel-to-channel isolation or high-voltage measurement is more important, the PXIe-4300 may be more suitable.
PXIe-4302 vs PXIe-4303
The PXIe-4302 and PXIe-4303 both provide 32 differential analog input channels, 24-bit resolution, simultaneous sampling and selectable digital filters.
The primary difference is maximum sampling rate. The PXIe-4302 supports up to 5 kS/s per channel, while the PXIe-4303 supports up to 51.2 kS/s per channel. The PXIe-4302 is suitable for temperature, process and lower-bandwidth sensor signals, while the PXIe-4303 is designed for faster measurements.
Why Choose the PXIe-4302?
- 32 differential channels in one PXI Express module
- 24-bit resolution for precision measurements
- Simultaneous sampling across all channels
- Selectable ±100 mV and ±10 V ranges
- Independent digital filtering for each channel
- Up to four concurrent sample-rate configurations
- Multiple terminal options for voltage, current and rack-mounted systems
Frequently Asked Questions
What is the PXIe-4302 used for?
The PXIe-4302 is used for high-density voltage, thermocouple and current measurements in automated test, validation and data-logging systems.
How many analog input channels does it provide?
The module provides 32 differential analog input channels.
Does the PXIe-4302 sample all channels simultaneously?
Yes. Every channel has a dedicated ADC, allowing all 32 channels to sample simultaneously.
What is the maximum sampling rate?
The PXIe-4302 supports sampling rates up to 5 kS/s per channel.
Which input ranges are available?
The module provides nominal ±100 mV and ±10 V input ranges.
Can the PXIe-4302 measure thermocouples?
Yes. It supports thermocouple measurements when used with suitable terminal hardware, cold-junction compensation and software configuration.
Which terminal block is used for current measurements?
The TB-4302C, part number 783871-01, is the current-input front-mount terminal block for the PXIe-4302.
Is the PXIe-4302 channel-to-channel isolated?
No. The PXIe-4302 does not provide channel-to-channel isolation. Consider an isolated module when measuring signals with significant common-mode voltage differences.
What is the PXIe-4302 part number?
The standard NI part number for the PXIe-4302 is 783865-01.
Request a Quote for the PXIe-4302
Contact us for current availability, lead time and project pricing for the PXIe-4302 Simultaneous Analog Input Module. We can also help confirm compatible terminal blocks, cables, PXI chassis and related measurement modules for your application.
