Model 6220/6221 Reference Manual Applications E-5
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Figure E-3
Diode curves
Transistor characterization
The Model 622x can be used with a Keithley 24xx SourceMeter to characterize a
device’s electrical DC parameters. Such a test system for a BJT is shown in
Figure E-4.
The Model 622x current source can be configured to sweep a number of base cur-
rents for the test. The Model 24xx SourceMeter is configured to sweep voltage
and measure current. External triggering (Trigger Link) is used between the two
instruments to synchronize the testing process.
When the test is started, the Model 622x will output the first base current and
send a trigger pulse to the SourceMeter to start its operations. The SourceMeter
will run the voltage sweep and measure current at each sweep point. After the
sweep is complete, the SourceMeter sends a trigger to the Model 622x to output
the next base current. This back and forth triggering between the two instruments
will continue until all the collector I-V curves at the different base current levels are
acquired.
100µA
10µA
100pA
0.1V 0.2V 0.3V 0.4V 0.5V 0.6V
V
F
A = 1N914
B = 1N4007
C = 1N645
D = 2N4392 (gate-to-source)
AB C D
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