Remote sense applied
1. Modification
 - Remote sense feature is applied to 7.5V measurement instead of voltage correction.
 When it is valid, 'SENSe ON;' GPIB command is issued; otherwise OFF.
 - The 7.5V_0 and _1 are parallel connected. Only channel A of e-load is used.
 - There are cables independent from power line for remote sensing.
 Relay in additional attachment switches J6 and J7 by J6_7SEL signal.