NI 9234 声音与振动输入模块

【产品详情】

4通道，51.2 kS/s/ch，±5 V，C系列声音与振动输入模块

NI‑9234可以测量来自集成电子压电(IEPE)和非IEPE传感器的信号，例如加速度计、转速计和接近式探针。 NI‑9234还可兼容智能TEDS传感器。\n\nNI‑9234提供了宽动态范围，并集成了软件可选的AC/DC耦合和IEPE信号调理。 输入通道可同步测量信号。 每个通道还具有内置的抗混叠滤波器，可自动调整至采样率。 当与NI软件一起使用时，该模块提供用于状态监测的处理功能，例如频率分析和阶次跟踪。

NI USB-9234 模拟输入通道通过一个 50 Ω 的电阻连接至机箱地。如要最小化

对地噪声，应确保机箱接地。每个通道均具有过压保护功能。 NI USB-9234

的每条通道可被配置为 AC 或 DC 耦合。在 AC 耦合模式 （软件）下，可打

开或关闭 IEPE 激励电流。 DC 耦合模式下，IEPE 电流不可用。每个通道的输

入信号经缓冲、调理后，由 24 位 Delta-Sigma 模数转换器对其采样。

NI USB-9234 主要通过通带平滑度和相位非线性度定量表示通带内信号。滤

波器可最大程度地抑制阻带内频率，即阻带抑制。无混叠带宽范围内的所有

信号均为无混叠信号或至少经阻带抑制过滤的信号。

通带

通带内信号的增益和衰减是基于频率变化的。通带平坦度是指相对于某频率

范围，增益的变化幅度非常小。 NI USB-9234 使用数字滤波器调整通带频率

范围，使其与采样率匹配。因此，给定频率下的增益和衰减取决于采样率。

图 11 为 51.2 kS/s 采样率下的典型通带平坦度

NI 9234 声音与振动输入模块

【英文介绍】

4-channel, 51.2kS /s/ch, ± 5V, Series C sound and vibration input module

The NI‑9234 can measure signals from integrated electronic piezoelectricity (IEPE) and non-IEPE sensors, such as accelerometers, tachometers, and proximity probes. NI‑9234 is also compatible with intelligent TEDS sensors. \n\nNI‑9234 offers a wide dynamic range and integrates software-optional AC/DC coupling and IEPE signal conditioning. The input channel synchronizes the measurement signal. Each channel also has a built-in anti-aliasing filter that automatically adjusts to the sampling rate. When used with NI software, the module provides processing functions for condition monitoring, such as frequency analysis and order tracking.

The NI USB-9234 analog input channel is connected to the chassis through a 50 Ω resistor. To minimize

For ground noise, ensure that the chassis is grounded. Each channel has overvoltage protection. NI USB-9234

Each channel can be configured as AC or DC coupling. In AC coupling mode (software), can play

Turn the IEPE drive current on or off. In DC coupling mode, the IEPE current is unavailable. Each channel loses

After buffering and conditioning, the incoming signal is sampled by a 24-bit Delta-Sigma analog-to-digital converter.

NI USB-9234 quantitatively represents the signal in the passband mainly by passband smoothness and phase nonlinearity. The filter

The wave detector can suppress the stopband frequency to the greatest extent, that is, stopband suppression. None in the aliasing bandwidth range

The signals are aliasing free or at least filtered by stopband suppression.

passband

The gain and attenuation of the signal in the passband are based on the frequency change. Passband flatness is relative to a certain frequency

The range of gain changes is very small. The NI USB-9234 uses a digital filter to adjust the passband frequency

Range so that it matches the sample rate. Therefore, the gain and attenuation at a given frequency depend on the sampling rate.

Figure 11 shows the typical passband flatness at a sample rate of 51.2 kS/s

NI 9234 声音与振动输入模块

【其他型号推荐】