A technician working
at a small wind turbine manufacturing company is performing the last of many, final
quality assurance checks on a system to be shipped. The test requires that the
voltage signal and the current signal be checked. When the system is operating
correctly, the two signals are not in phase. (The voltage and current do not
increase and decrease at the same time.) The technician expects the voltage to
go down after the current goes down. That is (for the system being tested) the
voltage “lags” the current. The technician uses a two channel oscilloscope to
track the voltage and current signals at the same time. This measurement tool
has beams (two dots on the screen) that sweep from left to right as they trace
the two signals onto the screen at the same time.
In the oscilloscope
cartoon below, the turbine's voltage signal is connected to Channel B and its
current signal is connected to Channel A. The technician has the wind turbine shipped
to the customer. (Yes or No). Submit your answer below this blog post, or at www.fl-ate.org.
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