Keithley S530 User Manual page 66

Parametric test system

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Section 3: Test subroutine library reference

The I

versus V

negative slope). The re subroutine drops all points with a negative slope in its calculation of the

emitter resistance. An error code, "IFLAG=1" is generated if there are too few remaining points to

continue the calculation of re.

A delay is incorporated into the re subroutine; this delay is the calculated time required for stable

forcing of I

If a zero or negative substrate pin is specified, the substrate is left floating. If the pin number is

greater than 0 and V

connected and forced.

V/I polarities

NPN +I

and -V

PNP -I

and -V

Source-measure units (SMUs)



SMU1: Set to VMTR, measures V



SMU2: Sweeps I



SMU3: Forces vsub, default current limit

Example

result = re(e, b, c, sub, ib1, ib2, vsub, npts, &iflag, &r)

Schematic

3-54

curve has a flyback region where V

with a 30 V voltage limit.

is less than 0.9 mV, the substrate is grounded. In all other cases, it is

SUB

, 3 V voltage limit

S530 Parametric Test System Test Subroutine Library User's Manual

decreases as I

increases (the curve has a

S530-907-01 Rev. A / September 2015

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