3: Source-measure hardware Model 4200A-SCS Parameter Analyzer
3-30 4200A-901-01 Rev. C / February 2017
Sink overview
When operating as a sink (V and I have opposite polarity), the SMU is dissipating power rather than
sourcing it. An external source (such as another SMU) or an energy storage device (like a capacitor)
can force operation into the sink region.
For example, if a second SMU that is sourcing +12 V is connected to the first SMU programmed for
+10 V, sink operation for the first SMU will occur in the second quadrant (source +V and measure −I).
When using the I-Source as a sink, always set the voltage compliance to a level that is higher than
the external voltage level. Failure to do so could damage the SMU or preamplifier due to excessive
current that will flow into the unit.
4200-SMU sink boundaries
Nominal 4200-SMU boundaries are shown in the next figure. Note that actual boundaries are 210 V
at 10.5 mA or 21 V at 105 mA.
Figure 65: 4200-SMU and 4200-PA operating boundaries
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