Trigger Link (for Keithley multimeter)

Connected to mini-din on back of Keithley
The box provides two logic signals on: 
BNC trigger-in to external start single measurement (meter as slave)

BNC meter-ready to indicate a completed measurement( meter as master)
Technically this output is a so-called "open collector output"
this means it is only a open/closed switch to ground and generates
no voltage by itself. Most trigger-inputs have a "pull-up resistor"
inside to convert it to a logic voltage-step. 
Monitoring on a scope: Connect it with a BNC-TEE to such a device or 
bias it with >2kohm from a 3..5V supply.