Pmu Capacitive Charging/Discharging Effects - Keithley 4200A-SCS User Manual

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

PMU capacitive charging/discharging effects

During pulse transitions, the measured current charges and discharges the capacitance in the system
(see following figure, red waveform). This system capacitance consists of the cable capacitance,
PMU (with RPM, if connected) capacitance, and device capacitance. The following figure shows the
pulse waveform showing capacitive charging and discharging current waveform in relation to the
applied voltage waveform of the PMU connected to the supplied 2 m (6.5 ft) SMA cable (no DUT
connected).
4200A-PMU-900-01 Rev. A December 2020
Figure 64: 4225-RPM current signal settling time
Figure 65: Capacitive charging and discharging
Section 3: Setting up PMUs and PGUs in Clarius
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