DIGIFAS7116 DIGIFAS7116
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DIGIFAS7116*-*DIGIFAS7116
DIGIFAS7116*-*DIGIFAS7116
负温度系数热敏电阻(NTC)的检测。(1)、测量标称电阻值Rt用万用表测量NTC热敏电阻的方法与测量普通固定电阻的方法相同,即根据NTC热敏电阻的标称阻值选择合适的电阻挡可直接测出Rt的实际值。但因NTC热敏电阻对温度很敏感,故测试时应注意以下几点:ARt是生产厂家在环境温度为25℃时所测得的,所以用万用表测量Rt时,亦应在环境温度接近25℃时进行,以保证测试的可信度。B测量功率不得超过规定值,以免电流热效应引起测量误差。C注意正确操作。测试时,不要用手捏住热敏电阻体,以防止人体温度对测试产生影响。(2)、估测温度系数αt先在室温t1下测得电阻值Rt1,再用电烙铁作热源,靠近热敏电阻Rt,测出电阻值RT2,同时用温度计测出此时热敏电阻RT表面的平均温度t2再进行计算。:张亮(工程师) 专线:
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3、压敏电阻的检测。用万用表的R×1k挡测量压敏电阻两引脚之间的正、反向绝缘电阻,均为无穷大,否则,说明漏电流大。若所测电阻很小,说明压敏电阻已损坏,不能使用。
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