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ABernard
True RMS responding DMMs measure the "heating" potential of an applied voltage. Power dissipated in a resistor is proportional to the square of an applied voltage, independent of the wave shape of the signal. Today’s general purpose DMMs can accurately measures true RMS voltage or current, as long as the wave shape
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swperk
I have an 89441A with several installed options. As a matter of principle, I would like to back up the instrument configuration in case I need to restore it someday due to a CPU or NVRAM failure. According to the service manual, there is a function in the service menu to do just this. Unfortunately, when I try to use this function I am unable to
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Lin_Ming_Chih
初學者對傳輸線的阻抗的概念常常會感到迷惑,Microwave/RF對傳輸線的阻抗有完整的定義V+/I+,但是對非Microewave/RF出身的電子工程師而言可以從訊號的角度理解阻抗:當訊號傳輸速度便快,傳統低阻抗輸入,高阻抗輸出的傳輸架構開始被傳輸線影響而造成訊號變形,加上負載可以降低傳輸線的影響,當傳輸線阻抗與負載匹配則可以達到最小訊號變形,常用負載有串聯負載,並聯負載,Thevenin負載等等  
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