XS series operating manual
XS user manual v0.55 - 19 -
Maximum current limit : IMAX
Adjustable from 0.1 µA to 100.0 µA by 0.1µA step, and from 100µA to 1000µA by 1µA step.
The unit monitors permanently the current flowing through the sample under test and compares
according the 2 following possibilities :
The high limit ( IMAX) > 0 , the low limit (IMIN) is set to 0
If the measured current is > or = to the IMAX, then the test is FAIL ( breakdown)
The high limit ( IMAX) > 0 , the low limit (IMIN) is set to a value < IMAX
If the measured current is < IMAX and > IMIN then the test is PASS, otherwise the test is
FAIL ( breakdown or I < IMIN)
WARNING :
This detection mode can require between 200 and 300 msec. for the limit detection, and
during this time the current can increase quickly over the limit .
Fast maximum current limit : F(ast)IMAX
Specifications are identical to the IMAX detection mode .
However in the FIMAX mode the breakdown detection is fastest (20 msec.) than in IMAX mode
because the comparison with the current limit is performed directly by electronic circuits and not by
the embedded software.
Accuracy of the detection :
For a threshold between 0.1µA and 100.0µA : +/- (5%+ 1µA)
For a threshold between 100µA and 1000µA : +/- (5%+ 5µA)
Fast maximum current and variation current limit : FIMAX + I
This mode combines the FIMAX mode and the Delta I mode.
Maximum current and variation current limit : IMAX + I
This mode combines the IMAX mode and the Delta I mode.
Minimum current limit : IMIN
In the above detection modes it is possible to set a minimum value of current flowing through the
specimen under test : IMIN value adjustable from 0.0 µA up to 1000 µA to insure that the specimen
under test is correctly connected.
Without detection
In this mode there is no current monitoring.
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