MC2 Audio ti series Instruction Manual page 48

To summarise, if there is going to be program material present then use a wide
window value. A smaller value can be used for testing if this can be performed
under guaranteed conditions – no program material - and a set frequency
stimulus signal.
"Load OK" will illuminate for
this channel once a non-zero
"Window" value has been
entered.
So, entering the desired window value and pressing ENTER will cause the "Load
OK" LED to illuminate for this channel. As the load monitoring is optimised to
work at low levels, the system will stop taking readings when the operating level
is too high – this is shown by the "Load OK" LED extinguishing for that channel,
showing that the readings cannot be taken.
If the load readings are valid, and the load deviates outside of the set window for
more than a few seconds, then the "Check Load" LED will illuminate, and the
unit's status LED will turn yellow and begin to flash in the Device View.
"Check Load!" will illuminate if the
impedance is not within the
windowed range set.
Page 48
Enter a percentage deviation
allowable for this load, from
1 - 100%. A value of zero will
disable impedance monitoring
for this channel.
Amplifier Operator's Manual