Steren HER-256 Manual De Instrucciones página 19

If the red LED (ground) lights, it means that a pin
is touching the case (grounded).
3. To test banana plugs, connect each end to
the corresponding input. If there is continuity,
the LED in the middle of the banana plugs will
illuminate and a tone will be heard.
When testing cables with different connectors, such as Cannon to
6.3 mm, always plug the connectors on each side.
8 8
If a cable has pins connected to each other, as
in the case of unbalanced XLR, pin LEDs that
have continuity will light.