Keysight EL30000 Serie Guide D'utilisation page 40

Open sense leads
The sense leads are part of the input's feedback path. Connect them in such a way so that they do not inadvertently
become open circuited. The electronic load includes protection resistors that reduce the effect of open sense leads
during 4-wire-sensing. If the sense leads open during operation, the electronic load returns to the local sensing
mode, with the voltage at the input terminals approximately 5% higher than the programmed value.
Over-voltage protection considerations
You must take into account any voltage drop in the load leads when setting the over-voltage trip point. This is
because the OVP circuit senses at the input terminals and not at the sense terminals. Due to the voltage drop in the
load leads, the voltage sensed by the OVP circuit could be lower than the voltage being regulated at the DUT.
Output noise considerations
Any noise picked up on the sense leads will appear at the input terminals and may adversely affect CV load
regulation. Twist the sense leads or use a ribbon cable to minimize the pickup of external noise. In extremely noisy
environments it may be necessary to shield the sense leads. Ground the shield at the electronic load end only; do
not use the shield as one of the sensing conductors.
40 Keysight EL30000 Series User's Guide