Keithley SourceMeter 2425, Руководство по обслуживанию, Страница: 23 / 141

1-8 Performance Verification Model 2425 Service Manual
Setting the measurement range
When simultaneously sourcing and measuring either voltage or current, the measure range
is coupled to the source range, and you cannot independently control the measure range.
Thus, it is not necessary for you to set the measure range when testing voltage or current
measurement accuracy.
Compliance considerations
Compliance limits
When sourcing voltage, you can set the SourceMeter to limit current from 10nA to 3.15A.
Conversely, when sourcing current, you can set the SourceMeter to limit voltage from
0.2mV to 105V. The SourceMeter output will not exceed the programmed compliance
limit.
Types of compliance
There are two types of compliance that can occur: “real” and “range.” Depending on
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
highest possible reading of the measurement range. When in compliance, the source out-
put clamps at the 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.