Tektronix KEITHLEY SourceMeter 2606B Reference Manual page 225

Section 8: Theory of operation Model 2606B System SourceMeter® Instrument Reference Manual
Figure 94: Normal current source operation
Current source operation in voltage compliance
The following figure shows what happens if the resistance of the load is increased to 200 Ω. The DUT
load line for 200 Ω intersects the voltage compliance limit line, placing the instrument in voltage
compliance. In voltage compliance, the instrument cannot source its programmed current (100 mA).
For the 200 Ω DUT, the instrument only outputs 50 mA (at the 10 V limit).
As resistance increases, the slope of the DUT load line increases. As resistance increases and
approaches infinity (open output), the 2606B sources virtually 0 mA at 10 V. Conversely, as
resistance decreases, the slope of the DUT load line decreases. At zero resistance (shorted output),
the 2606B sources 100 mA at virtually 0 V.
Figure 95: Current source operation in voltage compliance
8-10 2606B-901-01 Rev. C November 2021