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NI USB-6343 BNC - User Manual

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National Instruments PXIe-6349 Manual
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Table of Contents

Questions and Answers

  • M
    Mark JohnsonAug 9, 2025
    Why am I seeing crosstalk when sampling multiple NI USB-6343 BNC channels?
    • S
      Susan SimmonsAug 10, 2025
      Crosstalk or ghost voltages when sampling multiple channels on NI I/O Systems can occur due to charge injection. To resolve this, use a voltage follower with operational amplifiers (op-amps) with unity gain for each high-impedance source before connecting to an X Series device. Alternatively, decrease the sample rate for each channel. If you are sampling among multiple channels at various gains, refer to the Multichannel Scanning Considerations section of Chapter 4, Analog Input.
  • J
    Justin MitchellAug 19, 2025
    What to do if NI USB-6343 BNC I/O Systems readings are random in differential analog input ground-reference mode?
    • M
      Melissa PatelAug 19, 2025
      If you observe random readings with rapid drift in differential analog input ground-reference mode on your NI I/O Systems device, check the ground-reference connections. Also, ensure that the signal is referenced to the same ground level as the device reference.
  • S
    Sarah GarciaAug 30, 2025
    How to fix glitches on the output signal of NI USB-6343 BNC I/O Systems?
    • J
      Joshua KhanAug 31, 2025
      Glitches on the output signal of NI I/O Systems can occur when a DAC switches from one voltage to another. To mitigate this, build a lowpass deglitching filter to remove some of these glitches.

Summary

Chapter 1 Getting Started

Safety Guidelines

Essential safety precautions and warnings for operating the device.

Installation

Step-by-step instructions for installing the hardware and software.

Device Self-Calibration

Chapter 2 DAQ System Overview

DAQ Hardware

Programming Devices in Software

How to program the devices using NI-DAQmx driver and software.

Chapter 3 Connector and LED Information

I;O Connector Signal Descriptions

Detailed explanation of signals found on the device's I/O connectors.

Chapter 4 Analog Input

Analog Input Ground-Reference Settings

Configuration of differential, RSE, and NRSE input modes.

Analog Input Data Acquisition Methods

Analog Input Triggering

Actions that can be initiated by analog input triggers.

Field Wiring Considerations

Chapter 5 Analog Output

AO Reference Selection

Setting the analog output range and its impact on resolution.

Analog Output Data Generation Methods

Chapter 6 Digital I;O

Digital Input Data Acquisition Methods

Digital Input Triggering

Triggering actions for digital input operations.

Digital Waveform Generation

Chapter 7 Counters

Counter Timing Engine

How counters use sample clocks and external signals for timing.

Frequency Measurement

Methods for measuring frequency using counters.

Position Measurement

Counter Output Applications

Chapter 8 PFI

Using PFI Terminals as Timing Input Signals

Routing external timing signals to X Series functions using PFI terminals.

Chapter 9 Digital Routing and Clock Generation

Clock Routing

Understanding how clock signals are routed within an X Series device.

Synchronizing Multiple Devices

Chapter 10 Bus Interface

Data Transfer Methods

How data is moved between host memory and acquisition circuits.

USB Device Data Transfer Methods

Chapter 11 Triggering

Triggering with a Digital Source

Triggering with an Analog Source

Analog Trigger Types

Appendix B Where to Go from Here

Example Programs

Related Documentation

NI-DAQmx

Information on NI-DAQmx API, concepts, and applications.

LabVIEW

Appendix C Troubleshooting

Analog Input

Troubleshooting common analog input issues like crosstalk and ghost voltages.

Analog Output

NI USB-6343 BNC Specifications

General IconGeneral
Analog Output Channels4
Sample Rate (Analog Output)900 kS/s
Resolution16-bit
Communication InterfaceUSB
Counter/Timers4
Counter/Timer Resolution32-bit
Digital I/O Logic LevelsTTL
Connector TypeBNC
Sample Rate (Analog Input)500 kS/s
Input Voltage Range+/- 10 V
Operating Temperature0 °C to 45 °C
Analog Input Channels32 (16 differential)

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