Section 4: Use the RPM to switch the SMU, CVU, and PMU
Model 4200A-SCS Parameter Analyzer User's Manual
4-4
4200A-900-01 Rev. C / January 2019
Connection schematic
The hardware connections from the output terminals of the instruments in the 4200A-SCS are
connected to the input terminals of the two 4225-RPMs and then from the output terminals of the two
RPMs to the diode under test, as shown in the next figure.
The Sense and Force output terminals of 4200-SMU Channel 1 are connected to the SMU Sense and
SMU Force connections of 4225-RPM Channel 1 using 4200-TRX-2 or 4200-MTRX-2 triaxial to
triaxial cables. The same connection is made between 4200-SMU Channel 2 and 4225-RPM
Channel 2, using the same cable model.
The HPOT and HCUR output terminals of the 4210-CVU are connected to the CVU Pot and CVU Cur
inputs of 4225-RPM Channel 1 using CA-447A SMA cables. The LPOT and LCUR output terminals of
the 4210-CVU are connected to the CVU Pot and CVU Cur inputs of 4225-RPM Channel 2 using
CA-447A SMA cables.
The output terminals of the 4225-PMUs are connected to the RPM Control inputs of their respective
channels on the 4225-RPMs.
The Force and Sense output terminals from 4225-RPM Channel 1 are connected to the anode of the
diode using two triaxial cables (part number CA-534-24A) and a triaxial tee (237-TRX-T). These
triaxial cables are rated for accurate low current (I-V) and high frequency (C-V and pulsed I-V)
measurements.
The output terminals of 4225-RPM Channel 2 are connected to the cathode of the diode using the
same cables and triaxial tee as those for Channel 1. To prevent noisy measurements, enclose the
diode in a conductive shield connected to the Force LO terminal of the 4200A-SCS.
Figure 30: Connections from the 4200A-SCS and 4225-RPMs to the diode
