Table 6-2 Compliance Examples; Determining Compliance Limit - Keithley SourceMeter 2400 User Manual

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2400 Series SourceMeter User's Manual
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.
Table 6-2
Compliance examples
Compliance setting
Display message
Cmpl: 0.15000kV
Cmpl: 0.15000kV
Cmpl: 0.15000kV
Cmpl: 075.000 mA
Cmpl: 075.000 mA
Cmpl: 075.000 mA
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.
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Source-Measure Concepts
Measurement range
Setting Display message Range
150V ---.---V 200V
150V --.----V 20V
150V ---.---mV 200mV
75mA ---.---mA 100mA
75mA --.----mA 10mA
75mA -.-----mA 1mA
6-5
Actual compliance
Value Type
150V Real
21V Range
210mV Range
75mA Real
10.5mA Range
1.05mA Range