Model 4200A-SCS Parameter Analyzer Reference Manual
Section 3: Source-measure hardware
4200A-901-01 Rev. C / February 2017
3-29
Remote sensing
The remote sensing method shown in the next figure is generally preferred for measurements on low-
impedance DUTs. With this configuration, the test current I is forced through the DUT through one set
of test cables, while the voltage across the DUT is measured through a second set of sense cables.
Although some small current (I
S
) may flow through these sense cables, it is usually negligible
(typically pA or less) and can generally be ignored. Since the voltage drop across the sense cables is
negligible, the voltage actually measured by the SMU (V
M
) is essentially the same as the voltage
across the DUT (V
DUT
).
Figure 64: Remote sensing
Sensing considerations
Local sensing is adequate for many test and measurement situations. However, for maximum
accuracy, it is recommended that you use remote sensing for the following source-measure
conditions:
•
Test circuit impedance is <1 kΩ.
•
Maximum V-Source or V-Measure accuracy are required
Specified accuracies for both source and measure are achieved using remote sensing.
