Customer Description Magnetic Transducer Sob erton Part No. ST-025BT Date2008-12-18 Customer Model No. Date of Approval Authorization Signature
211 N. First Street Minneapolis, MN. 55401 612-849-6205 Http://www.sob erton.com E-mail info@sob erton.com
A:SCOPE This specification applies magnetic buzzer, ST-025BT B:SPECIFICATION Test condition: TEMP=+25�2 Related humidity=45~60�5% Air pressure:860-1060mbar NO. Item Unit Specification Condition Rated Voltage Vo-p 1 Vo-p 3.6 2 Operating Voltage Vo-p - 4.5Applying rated voltage & rated frequency, square wave 1/2 duty
� 3 Distance at 10cm(A-weight free air), Applying rated voltage & rated frequency, square wave,1/2duty
Rated Frequency Operating Temp Storage Temp Dimension Weight Material Terminal Environmental Protection RegulationLCP (Black) SMD type See attached drawing See attached drawing.
C:ENVIRONMENT TEST No. 1 2 Item High temp. test Low temp. test Test condition After being placed in a chamber at +85 for 96 hours. After being placed in a chamber at -30 for 96 hours. The part shall be subjected to 10 cycles. One cycle shall consist of; Thermal shock
After the test the part shall meet specifications without any degradation in appearance and performance except SPL. after 4 hours at +25, The SPL shall � 10 dBA compared with initial one.Applying rated voltage, rated frequency, square wave , 1/2 duty cycle Operating life test
Ordinary temperature The part shall be subjected to 96 hours at room temperature.
Evaluation standard After the test the part shall meet specifications without any degradation in appearance and performance except SPL. after 4 hours at +25,The SPL shall � 10 dBA compared with initial one.