Accelerometers with a digital signal output are widely used for the motion sensing of internet of things devices, vibration monitoring in industries, or scientific observations. Calibrating their frequency response is essential in extracting the correct information from measurements. However, the dynamic calibration method of a digital sensor has not yet been established. This study develops a simple synchronized data acquisition system for digital and analog signals and implements it in the primary calibration system of accelerometers. Using the constructed system, response of a digital accelerometer, including both sensitivity modulus and phase shift, is accurately determined. The measurement uncertainty was evaluated in detail, and the estimated values for the sensitivity modulus and the phase shift were below 0.2% and 0.1, respectively. The uncertainty source component specific to the digital signal acquisition system was negligible compared to the total uncertainty.

具有数字信号输出的加速度计广泛用于物联网设备的运动传感、工业振动监测或科学观测。校准它们的频率响应对于从测量中提取正确的信息至关重要。然而，数字传感器的动态校准方法尚未建立。本研究开发了一个简单的数字和模拟信号同步数据采集系统，并将其应用于加速度计的主要校准系统。使用构建的系统，可以准确确定数字加速度计的响应，包括灵敏度模量和相移。详细评估了测量不确定度，灵敏度模量和相移的估计值分别低于 0.2% 和 0.1。