BK Precision XLN3640 - Page 127

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(-S) and negative lead (-) of the DC output are connected to the negative
end (-) of the device under test. This connection will compensate the
voltage dropped due to current flow through long power wires (the
maximum compensation voltage is 2 V or 5 V depending on the model).
(24) AC power input:
The power receptacle is rated for a power input within 100 VAC - 240
VAC.