Keithley 2520, User Manual, Page: 292 / 329

F-8 Measurement Considerations Model 2520 User’s Manual
Sense lead connections
Proper sense lead connections to the laser diode are important to good measurements.
Figure F-7 shows a comparison of correct and incorrect sense connections. With the incor-
rect connections shown in Figure F-7A, sense and current leads are not connected together
at the DUT. In contrast, the correct connections shown in Figure F-7B show sense connec-
tions made separately to the DUT with the sense leads connected as close to the DUT
body as possible.
Figure F-7
Sense lead connections
DUT
A. Incorrect: sense leads not connected at DUT.
DUT
B. Correct: sense leads connected at DUT.
Voltage Sense HI
Current Output HI
Current Output LO
Voltage Sense LO
Voltage Sense HI
Current Output HI
Current Output LO
Voltage Sense LO
Connecting
Cables
Connecting
Cables