Section 5: Pulse measure and pulse generator units
Model 4200A-SCS Parameter Analyzer Reference Manual
5-18
4200A-901-01 Rev. C / February 2017
RPM connections to DUT
With an RPM installed, NEVER make connections directly to any of the SMA connectors (CH1 and
CH2) on the PMU module. This may result in damage to the PMU or DUT or may produce corrupt
data.
A device under test (DUT) can be tested using local sensing or remote sensing. Local sensing is
performed at the RPM, while remote sensing is performed at the DUT. When using remote sensing,
errors due to voltage drops in the Force path between the RPM and the DUT are eliminated. With
proper cabling, SMU or CVU tests provide remote sensing through the RPM.
Local sensing
For local sensing, only the Force output terminal of the RPM is connected to the DUT. The Sense
output terminal is not used. The next figure shows local sense connections using the supplied adapter
cable and adapters. For the two-terminal test shown in the next figure, the local ground is left
unconnected. Test circuit low is connected to the shield of the Force connector through the cables.
Figure 157: Two-terminal local sense connections using the SMA to dual SSMC adapter cable
A. Triax male-to-BNC female adapter (supplied with the RPM)
B. BNC male-to-SMA female adapter (supplied with the RPM)
C. White SMA cable (8 in./20.32 cm, supplied with the RPM)
D. SMA-to-SSMC Adapter Cable (4200-PRB-C, supplied with the PMU)
The needle holders shown in the previous two figures are supplied by the user.
When using two RPMs for four-terminal testing, two Y-cable assemblies are required. Make sure to
connect the two local grounds of the two cable assemblies together (see next figure).
