Agilent 4155B/4156B User’s Guide Vol.2, Edition 5 3-57
Measurement Functions
Compliance
Compliance
Compliance is available for SMU (HPSMU, MPSMU, HRSMU) and VSU.
To prevent damage to the test device due to overcurrent, overvoltage, or overpower,
you can set current compliance, voltage compliance, or power compliance for SMU.
For VSU, current compliance is automatically set to approximately ±100 mA. You
cannot change it.
Voltage and Current Compliance
Voltage compliance (V compliance) and current compliance (I compliance) are
limiters that can be set with the same resolution and accuracy as output current or
output voltage. Voltage compliance is for the SMU in current output mode, current
compliance is for the SMU in voltage output mode.
When a unit reaches compliance, the unit acts as a constant voltage source or a
constant current source. The unit keeps the output value when reaching compliance.
For compliance setting range and resolution, refer to Table 3-6 to Table 3-9.
Polarity and Output Area
• Polarity of Voltage compliance
The 4155B/4156B automatically sets V compliance polarity to the same polarity
as the output current, regardless of the specified V compliance polarity. There is
no compliance for the opposite polarity.
• Polarity of Current compliance
The 4155B/4156B automatically sets I compliance for both the positive and
negative polarity, regardless of the I compliance polarity.
However, if the output voltage and the current compliance are opposite polarity,
the | I compliance | value is increased by an amount that is 2.5 % to 12 % of the
range value in the lowest range that includes I compliance. Figure 3-9 shows the
relation of the compliance and output.
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