UL 60065 - SEVENTH EDITION
(Sub) CLAUSE / ANNEX NUMBER:
Clause 4.2.4 c)
(Sub) CLAUSE / ANNEX HEADING:
Normal Operating Conditions
OTHER RELEVANT (Sub) CLAUSES / ANNEXES (as applicable):
Clause 4.2.4 a)
DESCRIPTION OF ISSUE:
What is the normal operating condition for an organ or similar keyboard instrument that contains an amplifier and a tone generator?
After connection of the instrument to its RATED LOAD IMPEDANCE and depressing the 10 manual keys and 2 bass pedals (if used), adjust the output to the point of NON-CLIPPED OUTPUT POWER. Then, reduce output power to 1/8 as described in Clause 4.2.4 a)
IEC 60065 does not make it clear that power is to be reduced to 1/8 of the NON-CLIPPED OUTPUT POWER as is done for audio amplifiers. This method was confirmed at an IEC Working Group meeting and through other European test agencies.
SEE RELATED PAG:
Clause 4.2.4 c) -- loading of organ or keyboard