OR , FOR APPLIANCES NOT COVERED BY THESE PARAGRAPHS , UNDER NORMAL OPERATING CONDITIONS AS INDICATED IN THE MANUFACTURER'S INSTRUCTIONS ;
. WHERE AN APPLIANCE IS MARKED WITH AN INDICATION OF THE NORMAL PERIOD OF OPERATION , THE OPERATING PERIOD SHALL BE OF THAT LENGTH ; IN ALL OTHER CASES NO LIMIT IS SET AS TO THE OPERATING PERIOD ; IT IS RECOMMENDED THAT THE APPLIANCE BE KEPT IN OPERATION WHILE MEASUREMENTS ARE EFFECTED AT VARIOUS FREQUENCIES ;
. NO RUNNING-IN PERIOD IS LAID DOWN , BUT PRIOR TO TESTING THE APPLIANCE MUST HAVE BEEN USED SUFFICIENTLY FOR ITS OPERATING CONDITION TO BE REPRESENTATIVE OF THE OPERATING CONDITION DURING THE NORMAL LIFE OF THE APPLIANCE ; RUNNING-IN SHALL BE CARRIED OUT BY THE MANUFACTURER ;
. OPERATION SHALL BE FROM A SUPPLY HAVING THE RATED VOLTAGE OF THE APPLIANCE . IF THE LEVEL OF INTERFERENCE VARIES CONSIDERABLY WITH SUPPLY VOLTAGE , A TEST SHALL BE CONDUCTED AT FREQUENCIES FOR WHICH THE RESULTS ARE CLOSEST TO THE LIMITS AND AT SUPPLY VOLTAGES BETWEEN 0 * 9 AND 1 * 1 TIMES THE RATED VOLTAGE OF THE APPLIANCE . APPLIANCES WITH MORE THAN ONE RATED VOLTAGE MUST BE TESTED AT THE RATED VOLTAGE WHICH CAUSES MAXIMUM INTERFERENCE ;
. THE MINIMUM OBSERVATION TIME T MENTIONED IN 2.2.4 SHALL BE , FOR EQUIPMENT WITH AUTOMATIC STOP , A COMPLETE PROGRAMME IF THIS PRODUCES 40 OR MORE COUNTED CLICKS . IF THE PROGRAMME DOES NOT PRODUCE 40 COUNTED CLICKS , IT SHALL BE REPEATED IN FULL AS OFTEN AS NECESSARY TO PRODUCE A MINIMUM OF 40 CLICKS , BUT WITH A TWO HOUR LIMIT IN THE CASE OF EQUIPMENT WITHOUT AUTOMATIC STOP IF 40 CLICKS ARE NOT PRODUCED WITHIN SUCH A PERIOD . THE INTERVAL BETWEEN THE END OF ONE PROGRAMME AND THE START OF THE NEXT PROGRAMME SHALL BE EXCLUDED FROM THE OBSERVATION TIME .
. WHEN DETERMINING N ( BUT NOT WHEN DETERMINING THE TYPICAL VALUE OF COUNTED CLICKS ) THE TIME T MAY BE RESTRICTED TO TWO HOURS FOR APPLIANCES WHICH ARE NOT PROGRAMME-CONTROLLED .
. FOR PROGRAMMED APPLIANCES AND APPLIANCES WITH AUTOMATIC STOP , THE PROGRAMME WHICH PRODUCES THE GREATEST NUMBER OF CLICKS SHALL BE CHOSEN FOR DETERMINING THE CLICK RATE N .
6.1.2 . FOR INTERPRETATION OF THE READINGS ON THE MEASURING SET THE FOLLOWING PROCEDURE SHALL BE ADOPTED :
. THE READINGS ON THE MEASURING RECEIVER SHALL BE OBSERVED FOR AT LEAST 15 SECONDS AT EACH MEASURING FREQUENCY , THE HIGHEST READING BEING RECORDED ;
. WITHIN THE RANGE 30 TO 300 MHZ , THE TESTS MUST BE CARRIED OUT AS FOLLOWS .
.1 . THE ENTIRE SPECTRUM SHALL BE MEASURED ;
NOTE : FOR THIS PURPOSE IT IS SUFFICIENT TO MEASURE AT THE FOLLOWING PREFERRED FREQUENCIES : 45 , 65 , 90 , 150 , 180 , 220 MHZ , WITH A TOLERANCE OF MORE OR LESS 5 MHZ .
.2 . THE MEASUREMENTS SHALL BE REPEATED ON AT