The limiter operation is recognized as On when the
following conditions exist.
Output peak current limiter (positive) is operated.
Output peak current limiter (negative) is operated.
Output average current limiter is operated.
Output power limiter is operated.
The External Signal Input port is particularly used
for several output modes including AC+DC-EXT,
AC-EXT, AC+DC-ADD, AC-ADD, AC+DC-Sync
and AC-Sync, AC-Sync and AC-VCA.
Connect to the External Signal Input port on the
rear panel via a coaxial cable with a BNC connector
when using an external input signal as the signal
source with external synchronization.