Keithley 2651A Reference Manual page 55

Model 2651A High Power System SourceMeter® Instrument Reference Manual
Model 2651A
I
2651A-901-01 Rev. A / March 2011
Figure 8: 2-wire resistance sensing
Input/Output HI
V
M
Input/Output LO
I = Current sourced
V = Voltage measured
M
V = Voltage across resistor
R
Measured resistance =
Actual resistance =
R
LEAD
Lead
V
V
Resistances
M R
R
LEAD
V
M = R
+ (2 × R
S
I
V
R
= R
S
I
Section 2: General operation
Test Current (I)
Resistance
R
S
Under Test
)
LEAD
2-33