Keithley 2520, User Manual, Page: 60 / 329

2-10 Connections Model 2520 User’s Manual
Connection considerations
When making connections to the laser diode, observe the following considerations to
avoid pulse degradation due to distributed inductance and other effects:
• Use only the supplied 15
Ω
coaxial cables.
• Keep cable lengths to a minimum.
• Connect the four cable shields together at the DUT.
• Carry cable shields as close to the DUT as possible. Minimize the length of
exposed (unshielded) signal lines.
• Dress the VOLTAGE SENSE cables as far away from the CURRENT OUTPUT
cables to avoid magnetic coupling. Twist the SENSE cables together to further
reduce magnetic coupling.
• Connect the VOLTAGE SENSE leads as close to the body of the DUT as possible.
NOTE See Appendix F , “ Measurement Considerations ,” for information on these and
other possible measurement problems and how to avoid them.