Thursday, December 23, 2010

Weak current College】 【resistance characteristics parameters】.

<br> <br> 1. nominal resistance: resistor above marked resistance. 2, allows error: nominal resistance and the actual resistance of difference with nominal resistance ratio percentage that deviation, it indicates that the resistance resistors for accuracy. Permissible error corresponding relationship .with accuracy levels are as follows: <br> <br> 1. nominal resistance: resistor above marked resistance. <br> <br> 2, allows error: nominal resistance and the actual resistance of difference with nominal resistance ratio percentage that deviation, .it indicates that the resistance resistors for accuracy. <br> <br> Permissible error and precision grade correspondence: ± 0.5% -0.05, ± 1% -0.1 (or 00), ± 2% -0.2 (or 0), ± 5 .% - Ⅰ, Ⅱ ± 10% -20%, ±-grade ⅲ <br> <br> 3. rated power: at normal atmospheric pressure 90-106.6KPa and environment temperature: -55 ° c ~ + 70 ° c, the .resistors long-term work the allowed maximum power dissipation. <br> <br> Wire-wound resistors rated power series (W): 1 / 20, 1 / 8, 1 / 4, 1 / 2, 1, 2, 4, .8, 10, 16, 25, 40, 50, 75, 100, 150, 250, 500 <br> <br> Nonlinear wound resistors rated power series (W): 1 / 20, 1 / 8, 1 / 4, 1 ./ 2, 1, 2, 5, 10, 25, 50, 100 <br> <br> 4. rated voltage: from resistance and rated power conversion out of voltage. <br> <br> 5, maximum working voltage: maximum .continuous operating voltage. When working in low atmospheric pressure, maximum operating voltage is low. <br> <br> 6. temperature coefficient: temperature 1 ° c per change resulting from the resistance values of relative change. Temperature coefficient of resistance is smaller, .the better stability. Resistance with temperature but increased for positive temperature coefficient, and conversely a negative temperature coefficient. <br> <br> 7, aging coefficient: resistors in long-term load rating, the resistance percentages relative change, it is the length .of the resistors life. <br> <br> 8, voltage coefficient: the voltage range, the voltage every variation 1 volt, the amount of relative change resistors. <br> <br> 9. noise: from resistors of irregular voltage fluctuations ., including thermal noise and current noise, thermal noise is irregular because the conductor internal electronic freedom movement, the conductor any two points in irregular changes. <br> <br>.

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