Microtest 6632 Series - ALC (Auto Level Control)

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4.13.2 ALC (Auto Level Control)
Display ALC ON Display ALC Fail
It is preset as <ALC OFF>. If selecting <ALC ON>, it ensures that the
voltage applied to both ends of Test Piece or the current flowing through
the Test Piece will be consistent with the parameter set value. If
selecting <ALC ON>, because the instrument needs to calculate the
voltage and the current for adjusting the output, it will increase the time
required for the measuring. If the Auto Level Control cannot achieve the
range to be set, the page will display < ALC unable to regulate>
message, and it recommend setting as <ALC OFF> because it will affect
the measuring speed.