Device Connections; Connection Schematic - Keithley 4200A-SCS User Manual

Model 4200A-SCS Pulse Card (PGU and PMU) User's Manual

Device connections

Using the supplied cables, make connections from the output terminals of the instruments to the input
terminals of the two RPMs. Connect the output terminals of the RPMs to the diode in a 4-wire
configuration to provide the best measurement accuracy and eliminate the lead resistance effects on
I-V and C-V measurements.
Hazardous voltages may be present on all output and guard terminals. To prevent electrical
shock that could cause injury or death, never connect or disconnect from the 4200A-SCS
while the output is on.
To prevent electric shock, test connections must be configured such that the user cannot
come in contact with test leads, conductors, or any device under test (DUT) that is in contact
with the conductors. It is good practice to disconnect DUTs from the instrument before
powering up the instrument. Safe installation requires proper shields, barriers, and grounding
to prevent contact with test lead and conductors.

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 following figure.
The Sense and Force output terminals of 4200-SMU or 4201-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 or
4201-SMU Channel 2 and 4225-RPM Channel 2, using the same cable model.
The HPOT and HCUR output terminals of the 4210-CVU or 4215-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 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-534-24B) 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.
4200A-PMU-900-01 Rev. A December 2020
Section 6: Use the RPM to switch the SMU, CVU, and PMU
6-3