Keithley SourceMeter 2400, User Manual, Page: 148 / 594

2400 Series SourceMeter
®
User’s Manual Source-Measure Concepts 6-5
NOTE
When in compliance, the source output may exceed the programmed value in
order to maintain the compliance limit.
Determining compliance limit
The relationships to determine which compliance is in effect are summarized as follows:
• Compliance Setting < Measurement Range = Real Compliance
• Measurement Range < Compliance Setting = Range Compliance
The compliance that is in effect can be determined by comparing the displayed compli-
ance setting to the present measurement range. Make sure the correct measurement func-
tion is displayed. If sourcing voltage, select the current measurement function. Conversely,
if sourcing current, select the voltage measurement function.
If the compliance setting is lower than the maximum compliance value on the present
fixed measurement range, then the compliance setting is the compliance limit. If the com-
pliance setting is higher than the measurement range, then the maximum compliance value
on that measurement range is the compliance limit.
Table 6-2 provides examples (Model 2400) for determining the actual compliance limit.
For the first three entries in the table, the compliance setting is 150V. On the 200V mea-
surement range, the actual compliance is 150V (compliance setting < measure range = real
compliance). On the 20V and 200mV measurement ranges, compliance is 21V and
210mV, respectively (measure range < compliance setting = range compliance). The same
rules apply for the next three entries for current compliance.
Over the bus, use the appropriate SCPI commands to determine the measurement range
and the compliance setting. Once those parameters are known, compare them as previ-
ously explained to determine the compliance in effect.
Table 6-2
Compliance examples
Compliance setting Measurement range Actual compliance
Display message Setting Display message Range Value Type
Cmpl: 0.15000kV
Cmpl: 0.15000kV
Cmpl: 0.15000kV
Cmpl: 075.000 mA
Cmpl: 075.000 mA
Cmpl: 075.000 mA
150V
150V
150V
75mA
75mA
75mA
---.---V
--.----V
---.---mV
---.---mA
--.----mA
-.-----mA
200V
20V
200mV
100mA
10mA
1mA
150V
21V
210mV
75mA
10.5mA
1.05mA
Real
Range
Range
Real
Range
Range
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