3: Source-measure hardware Model 4200A-SCS Parameter Analyzer
3-12 4200A-901-01 Rev. C / February 2017
Basic SMU/preamplifier circuit configuration
The basic SMU and preamplifier circuit configuration is shown in the next figure. This configuration is
similar to the SMU configuration discussed earlier, with the exception of the preamplifier, which adds
low-current source-measure capabilities. Preamplifier FORCE terminal is connected to DUT HI, while
DUT LO is connected to COMMON. See Basic source-measure connections (on page 2-1
) in the
4200A-SCS User’s Manual for more detailed information.
Figure 42: Basic SMU and preamplifier source-measure configuration
Compliance limit for a SMU with a 4200-PA
A current limit can be programmed for a SMU with a 4200-PA when it is sourcing voltage. However, a
voltage limit can be programmed when sourcing current. The compliance limit characteristics are the
same for a SMU with a 4200-PA as for a SMU alone. Refer to Compliance limits (on page 3-3
).
Using minimum compliance
The minimum compliance value is particularly applicable when measurement autorange is disabled.
When measurement autorange is disabled, the compliance value cannot be set below the minimum
value that is specified in the previous tables indicating 4200-PA compliance limits. When autorange is
enabled, the programmed compliance value cannot be set below 100 fA when sourcing voltage, or
below 20 mV when sourcing current.
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