公开(公告)号：US20140257735A1

公开(公告)日：2014-09-11

申请号：US14281030

申请日：2014-05-19

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Tamir E. Moran ,  Jatinderjit S. Bains ,  Daniel S. Wertz

IPC: G01R35/00

CPC classification number: G01R35/005 ,  G01R19/2516

Abstract: A user obtains a set of modules, inserts them into slots of a chassis, and interconnects the modules to form a modular instrument. A signal path extends through the modules. To support calibration of the signal path, a first of the modules (or the chassis or a calibration module) includes a calibration signal generator. A computer directs the first module to apply the calibration signal from the generator to the signal path, and measures the power (or amplitude) of the output of the signal path. The computer reads a factory-measured value A of the calibration signal amplitude from a memory of the first module (or the chassis or the calibration module). The value A and the measured output power of the signal path are used to determine a gain of the signal path. The system compensates for that gain when the signal path is used to measure live operational signals.

Abstract translation: 用户获取一组模块，将其插入到机箱的插槽中，并将模块互连以形成模块化仪器。 信号路径延伸穿过模块。 为了支持信号路径的校准，第一个模块（或机箱或校准模块）包括校准信号发生器。 计算机引导第一模块将来自发生器的校准信号施加到信号路径，并且测量信号路径的输出的功率（或幅度）。 计算机从第一个模块（或机箱或校准模块）的存储器读取校准信号振幅的出厂测量值A. 使用值A和信号路径的测量输出功率来确定信号路径的增益。 当信号路径用于测量实时操作信号时，系统补偿该增益。