High Precision Carbon Film Fixed Resistor CF Series Environmental Winding Resistance

Type

ITEM

PERFORMANCE AND QUALIITY ACCEPTANCE

TEST METHOD

Resistance to temperature
coefficient

1. Rx ＜ 100KΩ
PPM/℃ ＜ +350~500 PPM/℃

2. 100KΩ＞ Rx ＜1MΩ
PPM/℃ ＜ 0 ~ -700PPM/℃

Rx ＞1MΩ
PPM/℃ ＜ 0 ~ -1500PPM/℃

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

≤ ±(1%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

≤ ± (1%R + 0.5ohm)
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.

ITEM

PERFORMANCE AND QUALIITY ACCEPTANCE

TEST METHOD

Load life test

≤ ±(5%R + 0.05ohm)
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

≤± (5% 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

≤±(5%R+0.1Ω)

At 125 ℃ temperature, duration of 1000h