High Precision Thermal Fuse Resistor MF Series Low Error Metal Film Resistor

Type

ITEM

PERFORMANCE AND QUALIITY ACCEPTANCE

TEST METHOD

Resistance to temperature
coefficient

PPM/℃ ＜ 50PPM

R – RO 106
PPM/℃ = *
RO T- T0

R = Measured resistance(Ω)at T
T ℃
Ro = Measured resistance (Ω)at To
To ℃
T = Measured test temperature(℃)
To = Measured base temperature( ℃)

Short time overload

±(0.5%R + 0.05ohm)
Shall be no mechanical breakage

AC or DC voltage 2.5times the rated
Voltage for 5 seconds .

Voltage endurance

No breakdown or flashover

Lay the resistor on the 90° angle metal “V” peak is 1.42 times as much as insulate voltage .

Terminal strength

Shall be no mechanical breakage

Pull test apply 3.5KG force to the lead in the direction of lead axis for 30±5 seconds.

Heat resistively
against soldering

±(0.5%R + 0.05ohm)
Shall be no mechanical breakage

Dip the lead in to a solder bath having a temperature of 350℃ ± 10℃ up to 3±0.05mm from the body of the resistor and hold it for 3.5±0.5seconds leave the resistor ,at room temperature 1 hours after ,then Measure.

Load life test

±(1%R + 0.5ohm)
Shall be no mechanical breakage

In the constant temperature chamber 70℃ ,apply rated voltage for 1 hour and shut voltage for 0.5 hour and repeat this cycle for 1000 hours,

Solder ability

≥95%

Dip the lead in to a solder bath having a temperature of 260℃±5℃.
Time:5± 0.5seconds.

Humidity load test

≤± (2% R+ 0.1ohm)
Shall be no mechanical breakage

In temperature chamber 40℃±2℃,relative humidity 90 – 95%,Apply rated voltage 1.5hour and shut voltage 0.5 hour repeat this cycle for 1000 hours, leave in room temperature for 1 hour after test,

Vibration

Shall be no mechanical breakage

set a resistor at the vibration table and vibrate 10HZ—55HZ 10HZ/s. with 1.5mm amplitude in 1 min. when the change of frequency shall be completed uniformly. the vibration shall apply to 3 directions,vertical and horizontal to the axis of resistor each for 3h.

Endurance at upper-limit temperature

≤±(2%R+0.1Ω)

At 125 ℃ temperature, duration of 1000h