NI 9234作为4通道C系列动态信号采集模块，能针对配备NI CompactDAQ或NI
CompactRIO系统的集成电路压电式(IEPE)与非集成电路压电式(IEPE)传感器，进行高精度音频测量。NI 9234具有102
dB动态范围，并能对加速度传感器和麦克风进行软件可选式集成电路压电式(IEPE)信号调理。4条输入通道借助自动调节采样率的内置抗混叠滤波器，同时以每通道高达51.2
kHz的速率对信号进行数字化。
推荐使用的软件
NI声音与振动分析软件（包含：NI声音和振动测量套件及NI声音和振动套件）提供信号处理功能，用于声音测量、分数倍频程分析、频率分析、瞬态分析和阶次跟踪。NI分析软件具有NI声音与振动助手(Sound
and Vibration
Assistant)交互式软件，能够快速采集、分析并记录声学、噪音和振动数据。借助灵活且基于配置的测量库和开放式分析功能，声音与振动助手(Sound and
Vibration Assistant)能够基于软件进行独特的测量，从而快速采集数据，并创建自定义的应用程序。
|
|---|
Product Family | Industrial I / O
Signal Conditioning
|
Measurement Type | 加速计
麦克风
|
Form Factor | CompactDAQ
CompactRIO
|
Operating System / Target | Windows
|
RoHS Compliant | 是
|
|
|---|
单端通道 | 0
|
差分通道 | 4
|
模拟输入分辨率 | 24 bits
|
最大电压范围 | -5 V - 5 V
|
同步采样 A property of a measurement system in which each input or output channel is
digitized or updated at the same instant. You will need simultaneous sampling
for applications where the time relationship between inputs is important, such
as phase analysis of AC signals. Because channel-dedicated analog-to-digital converters (ADCs) are used to
sample data simultaneously between inputs, the maximum sample rate is applicable
to each channel and is not divided by the total number of channels. Devices that
don’t have simultaneous sampling capabilities use multiplexing to connect each
channel to its ADC. Interval scanning is a low-cost option to simulate simultaneous
sampling for low-frequency signals such as temperature or pressure. This method
scans the input channels at one interval and uses a second interval to determine
the time before repeating the scan. The input channels are scanned within
microseconds, creating the effect of simultaneously sampling the input
channels. | Yes
|
激励电流 | 2 mA
|
动态范围 The ratio of the highest signal level a circuit can handle to the smallest
signal level it can handle (usually equal to the noise level), normally
expressed in dB. | 102 dB
|
Maximum Bandwidth | 23.04 kHz
|
输入阻抗 | 305 kOhm
|
信号调理 | 抗混叠滤波器
电流激励
|
|
|---|
Number of Channels | 0
|
|
|---|
Bidirectional Channels | 0
|
Input-Only Channels | 0
|
Output-Only Channels | 0
|
|
|---|
Counters | 0
|
|
|---|
Length | 9 cm
|
Width | 2.3 cm
|
I / O Connector | BNC连接器
|
Operating Temperature | -40 °C - 70 °C |