1. application this specification is ap plicable to ceramic disc riminator CDBM450C24 use for communication equipment. 2. electrical characteristics this discriminator must need following performance. 2-1) anti-resonate frequency (fa) : 450 1.5 khz. 2-2) resonant impedance (ri): 70 ohms max. 2-3) f(fa-fr) : 48 5.0 khz. fr: resonant frequency 2-4) capacitance (at 1 khz) : 550 pf 20%. 3. environmental test 3-1) temperature characteristics at the temperature range of 25 5 ,the discriminators shall meet the electrical properties in item 2-1~2-4,and at ?20~+80 the anti-resonant frequency shall not very more than 2.0 khz. 3-2) vibration the discriminators shall suffer no m echanical damage and meet the 2-1~2-4 electrical characteristics af ter being vibrated with a sine wave motion having an amplitude of 1.0 mm from 10 to 55khz per 1 minute, applied for 30 minutes in three different directions (x,y,z). 3-3) humidity the discriminators shall be place in a humidity chamber at 90~95% relative humidity and 40~45 for a period of minimum 8 hours. the discriminators shall be left for the pe riod of more than 24 hours at the room temperature after its removal from the humidity chamber.the discriminators shall meet the 2-1~2-4 electrical characteristics and the appear ance of discriminators is to be normal. 3-4) dropped shock the discriminators shall suffer no mechanical damage and meet the 2-1~2-4 electrical characteristics outline d on this specification after being dropped 3 times to concrete floor from the 30 cm height. 3-5) solder ability the terminal surface shall be covered over 3/4 by the solder after dipped the leads into 230 5 solder pot containing (sn 63% pb 37%) molten alloy for 31 seconds. 3-6) soldering heat-resistance the discriminators shall be assembled to the 1 mm ?through-hole? p.c. bored and placed in solder solution (sn63% pb37%) at 250 10 for duration of 3 1 seconds. after removal from the solder solution chamber, the discriminators may be cleaned with chlorothene and le ft for more then 24 hours at the room CDBM450C24 ceramic discriminator http://www.luguang.cn mail:lge@luguang.cn
temperature. the discriminators shall meet the 2-1~2-4 electrical characteristics are to be normal. 3-7) lead strength the discriminators shall suffer no mech anical damage and meet the 2-1~2-4 electrical characteristics ou tlined on this specification af ter static load of 1.0 kg for 1 minute is applied in the dire ction of the insertion side. 3-8) temperature the discriminators shall be held at each cycle consist of three temperature levels(-20,+25,+80 ) for a period of each 30 minute and repeated 3 cycles. after the test the discriminators may be left for more than 24 hours at the room temperature. the discriminators shall meet the 2-1~2-4 electrical characteristics outlined on this specification and the appear ance of discriminators is to be normal. 4. appearance 4-1) appearance and dimension may conform to fig.1 4-2) identification the following shall be permanently and legibly marked. 5. dimensions (unit mm) fig 1. CDBM450C24 ceramic discriminator http://www.luguang.cn mail:lge@luguang.cn
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