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公开(公告)号：US20140244705A1
公开(公告)日：2014-08-28
申请号：US14267274
申请日：2014-05-01
Applicant: NATIONAL INSTRUMENTS CORPORATION
Inventor： Garritt W. Foote , Hector Rubio
IPC: H03H17/02
CPC classification number: H03H17/0248 , H03M1/1225 , H03M1/1245
Abstract: Provided is a method for processing data samples from a plurality of data channels. The method may include obtaining a plurality of data samples from the plurality of data channels. Obtaining the plurality of data samples may involve successively obtaining a data sample from each data channel of the plurality of data channels. Successively obtaining a data sample from each data channel may be performed a plurality of times during a specified time period. Each data sample of the plurality of data samples may be associated with a respective sample time, and each respective sample time may be relative to a single specified reference point in time. The method may further include, for each data sample of the plurality of data samples, determining a time-dependent coefficient value that may correspond to the sample time associated with the data sample, and applying the determined time-dependent coefficient value to the data sample.
Abstract translation: 提供了一种用于处理来自多个数据信道的数据样本的方法。 该方法可以包括从多个数据信道获得多个数据样本。 获取多个数据样本可以包括从多个数据信道的每个数据信道连续地获得数据样本。 可以在指定的时间段内连续地获得来自每个数据信道的数据样本多次。 多个数据样本的每个数据样本可以与相应的采样时间相关联，并且每个相应的采样时间可以相对于单个指定的参考点在时间上相关。 该方法还可以包括对于多个数据样本中的每个数据样本，确定可对应于与数据样本相关联的采样时间的时间依赖系数值，以及将所确定的时间依赖系数值应用于数据样本 。
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公开(公告)号：US09800229B2
公开(公告)日：2017-10-24
申请号：US14267274
申请日：2014-05-01
Applicant: NATIONAL INSTRUMENTS CORPORATION
Inventor： Garritt W. Foote , Hector Rubio
CPC classification number: H03H17/0248 , H03M1/1225 , H03M1/1245
Abstract: Provided is a method for processing data samples from a plurality of data channels. The method may include obtaining a plurality of data samples from the plurality of data channels. Obtaining the plurality of data samples may involve successively obtaining a data sample from each data channel of the plurality of data channels. Successively obtaining a data sample from each data channel may be performed a plurality of times during a specified time period. Each data sample of the plurality of data samples may be associated with a respective sample time, and each respective sample time may be relative to a single specified reference point in time. The method may further include, for each data sample of the plurality of data samples, determining a time-dependent coefficient value that may correspond to the sample time associated with the data sample, and applying the determined time-dependent coefficient value to the data sample.
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公开(公告)号：US20140285180A1
公开(公告)日：2014-09-25
申请号：US13849761
申请日：2013-03-25
Applicant: NATIONAL INSTRUMENTS CORPORATION
Inventor： Garritt W. Foote
CPC classification number: H03H11/52
Abstract: An improved measurement circuit includes a current transformer and an active feedback circuit operated as a negative resistance that matches the value of the winding resistance of the current transformer. An amplifier in the feedback circuit provides power to drive a secondary current through a sense resistor and the transformer winding resistance, reducing the most significant error source in a current transformer circuit by presenting a negative impedance to the current transformer. Combined with the positive resistance of the transformer's winding, the negative impedance results in a net burden of zero on the current transformer, which eliminates the need for the transformer having to provide power to drive the secondary current. This facilitates the use of smaller transformers while achieving reduced measurement errors. Thus, a single, compact measurement device may be used in a wide range of applications with high measurement performance.
Abstract translation: 改进的测量电路包括电流互感器和作为与电流互感器的绕组电阻的值匹配的负电阻的有源反馈电路。 反馈电路中的放大器提供通过检测电阻器驱动次级电流和变压器绕组电阻的功率，通过向电流互感器呈现负阻抗来减小电流互感器电路中最重要的误差源。 结合变压器绕组的正电阻，负阻抗导致电流互感器的净负载为零，这消除了变压器必须提供电力来驱动次级电流的需要。 这有助于使用较小的变压器，同时实现减少的测量误差。 因此，单个紧凑的测量装置可以在具有高测量性能的广泛应用中使用。
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