Performance Verification 1-9
Compliance considerations
Compliance limits
When sourcing voltage, you can set the SourceMeter to limit current from 1nA to 1.05A.
Conversely, when sourcing current, you can set the SourceMeter to limit voltage from 200μV
to 1.1kV. The SourceMeter output will not exceed the programmed compliance limit.
Types of compliance
There are two types o
f compliance that can occur: Real and range. Depending upon which
value is lower, the output will clamp at either the displayed compliance setting (real) or at the
maximum measurement range reading (range).
The real compliance condition can occur when the compliance setting is less than the high-
est possible reading of the measurement range. When in compliance, the source output clamps
at th
e displayed compliance value. For example, if the compliance voltage is set to 1V and the
measurement range is 2V, the output voltage will clamp (limit) at 1V.
Range compliance can occur when the compliance setting is higher than the possible reading
of the selected measurement range. When in compliance, the source output clamps at the
maximum measurement range reading (not the compliance value). For example, if the
compliance voltage is set to 1V and the measurement range is 200mV, the output voltage will
clamp (limit) at 210mV.
Determining compliance limit
The relationships to determine which compliance is in effect are summarized as follows.
They assume the measurement function is the same as the compliance function.
• Compliance Setting < Measurement Range = Real Compliance
• Measu
rement Range < Compliance Setting = Range Compliance
You can determine the compliance that is in effect by comparing the displayed compliance
setting
to the present measurement range. If the compliance setting is lower than the maximum
possible reading on the present measurement range, the compliance setting is the compliance
limit. If the compliance setting is higher than the measurement range, the maximum reading on
that measurement range is the compliance limit.
2410-902-01.book Page 9 Monday, November 7, 2005 2:49 PM
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