㈠Applicable：

  This standard specification is for use in consumer electronics, computers,telecommunications, control instruments...etc.

㈡Performance:

  1. Resistance Temperature Coefficient:
     It shall be within ±200ppm/℃ or +4500ppm/℃
     T.C (ppm/℃) =［(R2－R1)÷R1］×［1÷(T2－T1)］×10
     where R1: resistance value at reference temperature
           R2: resistance value at test temp.
           T1: reference temp. (usu. 25℃)
           T2: test temp. (about 75℃)

  2.Temperature Cycle:
    Following temp. cycles are to be made 5 times and then put at room temp. for one hour, the resistance value change ratebetween pre-and-post test shall be within ±1%.

  3.Short Time Over Load:
    When the resistors are applied 5 times as much as rated power for 5 seconds continuously, it shows no evidence of arc,flame...etc.Removing the voltage and place the resistors to the normal condition for 30 minutes, the resistance valuechange rate between pre-and-post test shall be within ±2%.

  4.Insulation Character :
    Resistors are located in a V -shaped metal trough. Using the DC 500V megger instrument 2 poles to clutch either side oflead wires and metal trough, measuring the Insulation Resistance which shall be over 1000MΩ.

  5 Voltage Withstanding:
    Resistors are located in aV-shaped metal trough.Applying AC1000V for an minute and should find no physical damage to the resistors, such as arc, char...etc.

  6.Load Life:
    The resistors arrayed are sent into the 70℃oven, applying rated voltage at the cycle of1.5hours ON,0.5 hourOFF for1000（+48-0） hours in total.Then,after removing the voltage take the resistors out of the oven and left under normal temp.forone hour cooling.The resistance value change rate between pre-and-post test shall be within ±3%.

  7 Moisture-proof Load Life:
    The resistors arrayed are placed into a constant temp./humidity oven at the temp. of 40±2℃ and the humidity of 90～95%,then 1/10 DC rated power is applied for1.5hours and cut off for0.5 hour.The similar cycle will be repeated for1000

（+48-0）hours intotal (including cut-off time). Then remove the voltage, taking the resistors out of the oven and leaving them at room temp.for an hour.The resistance value change ratebetween pre-and-post test shall be within ±3%Ther ealso shall be no evidence of remarkable change on appearance, and the marking shall not be illegible.

  8 Solder-ability:
    The leads with flux are dipped in a melted solder of 235 ±5℃ for 2 seconds, more than 95% of the circumference of the lead wires shall be covered with solder.

  9 Resistance to Soldering Heat: (Suitable for wave-flow and iron solderings):

    1.The leads of resistor are dipped to 1mm from the body in a melted solder of 270 ±5℃ for 10 ±1 seconds, or 350 ±10℃ for 3.5 ±0.5 seconds, Then remove the resistors and leaving them at room temp. for one hour. The resistance value
change rate between pre-and-post test shall be within ±1%.

    2.The leads of thermal element are dipped to 1mm from the body in a melted solder of 270 ±5℃ for 10 ±1 seconds,or 350 ±10℃ for 3.5 ±0.5 seconds, Then remove the resistors and leaving them at room temp.for one hour.Theresistance
valuechange rate between pre-and-post test shall be within ±1%.

 10 Non-flammability:
    The resistors have to fulfill "Fast release of the resistor at maximum overload", and shall not get flame.

 11 Surge Withstanding:
    The resistors are designed to withstand2.5kV.1.2/50µs pulse according toIEC61000-4-5, 30 pulses per voltage, 10seconds between each pulse. The resistance value change rate between pre-and-post test shall be within ±5%.