Lincoln Electric Semiautomatic Wire Feeders LN-9, Operator'S Manual

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Sec. N2.3.2 (continue)
9. Actual Value Push Button:
This button us used to allow the meter to be changed
from a preset readout to a reading of actual arc voltage
or wire feed speed.
10. Direct Work Lead Jack (below code 8200):
This jack permits connection of the direct work clip lead
to the LN-9 to more accurately monitor arc voltage. See
Sec. N4.4.4 for direct work lead connection of later LN-9
models.
11. Duty Cycle:
The amount of welding performed in a 10 minute period,
expressed as a percentage.