sTEm–at-Work Puzzle #33: Analysis for Possible SCR Failure
When the “Forward Breakover” voltage value is applied across the SCR, the SCR is “turned on”, the voltage drops immediately, and a large current through the SCR with a corresponding small change in voltage is possible. The tech also knows that measuring the SCR voltage and current values followed by the plot of this current (the “y” axis) vs. the voltage (along the “x” axis) data will determine if the SCR is behaving as it should behave. The technician provided the plot below.
The SCR circuit the technician tested is not functioning properly and it needs to be replaced. Yes or No.
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