Recently, many customers have left messages and asked about the electrical testing of self-recovery fuses. So how is the electrical property of the self-recovery fuse detected? Today, Xiaobian will share with you the "electrical" process method of self-recovery fuse detection as follows.
The "electrical" detection process of self-recovery fuse is as follows.
(1)I hold: holding current;
(2)I hold: the maximum no-action current (holding current), that is, the maximum current at which PPTC always keeps its low resistance state under the specified ambient temperature (25℃ is preferred);
(3)I hold: holding current;
(4)V max.: the maximum voltage that can be sustained;
(5)T trip: the maximum action time under the specified current;
(6)R: the zero power resistance measured at a certain temperature;
(7)I trip: action current;
(8)I max.: the maximum current that can be sustained;
(9)P d: steady-state power consumption in high resistance state;
(10)R 1max.: the maximum resistance value measured at room temperature after one hour of action or reflow;
How to treat the internal structure of the setting, as shown in the following figure, place the test sample in a test chamber with specified temperature and conditions. Connect the self-recovery fuse to a constant current source or a constant voltage source respectively, preset the current value to the specified I hold, and limit the voltage to 90% of V max. Measure and record the voltage at both ends of the self-recovery fuse after the specified time in the detailed specification, and the self-recovery fuse should not enter the action state.
End: we judge by the specification, generally, power-on is kept for 1h under Ihold, and after cooling for 1h, the zero-power resistance r is re-measured, and Rmin≤R≤R1max.
