Keithley 3720-ST

Section 8: Theory of operation Series 3700A System Switch/Multimeter Reference Manual
8-10 3700AS-901-01 Rev. D/June 2018
V
MEAS
includes the voltage drops of the input test leads (Input HI and Input LO). Therefore, the actual
voltage drop across the DUT is V
MEAS
minus the two voltage drops in the test leads. Because
matched inputs are used, the voltage drop is 2 × V
LEAD
. Therefore:
V
DUT
= V
MEAS
– 2(V
LEAD
)
Figure 111: Four-wire ratiometric method