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6-4
Source-Measure Concepts
2400 Series SourceMeter
®
User’s Manual
Compliance examples
When the SourceMeter goes into real compliance, the Cmpl label for the compliance dis-
play will flash. When the SourceMeter goes into range compliance, the units label (“mA”)
will flash instead. For the following examples, labels in boldface type indicate that they
are flashing.
Measurement Range: 100mA
Compliance Setting:
Cmpl:
075.000 mA Flashing Cmpl indicates that real compliance has
occurred. The output is clamped at 75mA.
Measurement Range: 10µA
Compliance Setting: Cmpl: 075.000
µA
Flashing mA indicates that range compliance has
occurred. The output is clamped at 10.5µA.
Compliance principles
Compliance acts as a clamp. If the output reaches the compliance value, the SourceMeter
will attempt to prevent the output from exceeding that value. This action implies that the
source will switch from a V-source to an I-source (or from an I-source to a V-source) when
in compliance. The clamping value is determined either by a user-defined value (compli-
ance setting) or the measurement range (range compliance) since the unit will not output
more than it is configured to measure.
Passive load compliance example
As an example, assume the following:
SourceMeter: V
SRC
= 10V; I
CMPL
= 10mA
DUT resistance: 1
Ω
With a source voltage of 10V and a DUT resistance of 1
Ω
, the current through the DUT
should be: 10V/1
Ω
= 10A. However, because the compliance is set to 10mA, the current
will not exceed that value, and the voltage across the resistance is limited to 10mV. In
effect, the 10V voltage source is transformed into a 10mA current source with a 10mV
compliance value.
Active load compliance example
A different situation exists when an active load is connected to the SourceMeter. For
example, assume that you wish to discharge a 6V battery to 5V at a 100mA discharge rate.
With this scenario, you would set the voltage source to 5V and the current compliance to
100mA. Under these circumstances the source polarity is reversed, and the SourceMeter
sinks instead of sourcing current. Battery discharging will continue until the battery volt-
age is reduced to the 5V source value.
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Содержание SourceMeter 2400
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