PMC720*-*PMC720
PMC720*-*PMC720
如果需要檢測判斷熱敏電阻是正溫度系數還是負溫度系數可在檢測熱敏電阻時在熱敏電阻的周圍加溫,如用電烙鐵靠近熱敏電阻。此時若測得的電阻值增大即為正溫度系數熱敏電阻。反之,則為負溫度系數熱敏電阻。
1、正溫度系數熱敏電阻(PTC)的檢測。檢測時,用萬用表R×1擋,具體可分兩步操作:A常溫檢測(室內溫度接近25℃);將兩表筆接觸PTC熱敏電阻的兩引腳測出其實際阻值,并與標稱阻值相對比,二者相差在±2Ω內即為正常。實際阻值若與標稱阻值相差過大,則說明其性能不良或已損壞。B加溫檢測;在常溫測試正常的基礎上,即可進行第二步測試—加溫檢測,將一熱源(例如電烙鐵)靠近PTC熱敏電阻對其加熱,同時用萬用表監(jiān)測其電阻值是否隨溫度的升高而增大,如是,說明熱敏電阻正常,若阻值無變化,說明其性能變劣,不
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