Keithley SourceMeter 3A 2420, Service Manual

Page: 22 / 136

1-8 Performance Verification
Maximum compliance values
The maximum compliance values for the measurement ranges are summarized in Table 1-2.
When the SourceMeter goes into compliance, the “Cmpl” label or the units label (i.e., “mA”)
for the compliance display will flash.
Determining compliance limit
The relationships to determine which compliance is in effect are summarized as follows.
They assume that the measurement function is the same as the compliance function.
• Compliance Setting < Measurement Range = Real Compliance
• Measurement 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
Taking the SourceMeter out of compliance
Verification measurements should not be made when the SourceMeter is in compliance. For
purposes of the verification tests, the SourceMeter can be taken out of compliance by going into
the edit mode and increasing the compliance limit.
NOTE
Do not take the unit out of compliance by decreasing the source value or changing the
range. Always use the recommended range and source settings when performing the
verification tests.
Table 1-2
Maximum compliance values
Measurement
range Maximum
compliance value
200mV
2V
20V
60V
10
µ
A
100
µ
A
1mA
10mA
100mA
1A
3A
210mV
2.1V
21V
63V
10.5
µ
A
105
µ
A
1.05mA
10.5mA
105mA
1.05A
3.15A