待机电流测试软件的一些疑问

shanshiyu

兄弟姐妹们,我最近用labview编写了一个测试待机电流的软件(GPIB, Agilent66311B),现在有一些疑问,请有经验的高手指点一二:
(1):待机电流的平均值是怎么计算的? 是取算术平均值还是要进行什么样的处理?
(2):采样时间(周期)设置为多少合适?GPIB卡有没有这么快的速度降数据写到excel中?如果没有的话,该如何处理?

pp_boby

这个问题比较难以回答！我也想知道！这个是我以前问题他们公司的邮件！
对于您的问题，在14565B的帮助文件中的windows function一节中有所阐述。我直接为您摘抄出答案，以供参考：

1.

DC Measurement

DC measurement is the average value of the sampled data. The number of data points upon which the measurement is based is determined by the sample rate. If the captured waveform data is not an integral number of cycles when measuring very low frequency waveforms, then the dc measurement will not be representative of the actual average dc current at the device under test.



NOTE: The dc value shown on the bottom of the display may differ from the value shown on the front panel of the instrument (and the Output Display area of the Main window). This is because the calculated measurements at the bottom of the screen are derived from the sample rate shown, which can be varied by changing the time/div selection (see Measurement Samples for more information). The front panel and Output Display area factory-default sample rate is 21,367 Hz. Differences in sample rates may result in differences in calculated measurements.



2.

RMS Measurement

RMS measurement is the root-mean-square of the sampled data. The number of data points upon which the measurement is based is determined by the sample rate.

  其中为采样点的电流值，n为采样点的个数。我不知道您所说的电源的积分具体是指什么功能，不知您能否说明一下。但是从能量角度来看的话，RMS值表示能够与所测电流产生相同功耗的直流电流值，因此可以用其来描述手机的真实耗流。



3.

High and Low Measurements

High and Low measurements are calculated using a histogram. The histogram is divided into 1024 bins between the maximum and minimum data point in the measurement buffer. The bin containing the most data points above the 50% point is the High bin - the average value of which is returned as the High value. The bin containing the most data points below the 50% point is the Low bin - the average value of which is returned as the Low value. If no bin contains at least 1.25% of the total number of measurement points, then the maximum or minimum values are returned as the High or Low measurements respectively .



Best wishes,

Cai,Chengxian



Agilent Open Lab, Agilent Technologies Co., Ltd.

Tel:    86-21-23017704

US2012

学习了，谢谢！

kingdomo

2个币，太贵了

lei147258