How does the light touch switch manufacturer detect the light touch switch? Being familiar with the method of detecting the various indicators of the tap switch helps us to choose the better quality tap switch. So, how to detect the indicators of the light touch switch, let's understand the light touch switch press force, pressure resistance, stroke, weldability, insulation resistance, welding heat resistance, pin strength, appearance size, functional action, contact resistance detection methods.
First, detect the press force of the light touch switch
In the center of the top surface of the touch switch handle, apply static load evenly according to the direction of the touch switch action, and measure twice, and take its average value. The measurement error should not be greater than 15%. The press force of the tap switch shall be within the scope specified in the component specification.
Two, detect the light touch switch voltage
The test voltage of AC250V(50Hz RMS) is applied between the contacts adjacent to the switch and between the contacts and other metal parts for 1min. During the test, there should be no breakdown, flaring, damage, flicker and other phenomena, and the leakage current should not exceed 0.5mA.
Three, detect the light touch switch travel
In the center of the top surface of the touch switch handle, evenly apply the maximum allowable press force according to the direction of the touch switch action, and measure the stroke with a vernier caliper, the measurement error is not more than 15%. The stroke of the tap switch shall be within the scope specified in the component specification.
Four, test the weldability of light touch switch
After dipping the welding part with flux, immerse the welding part into the molten solder tank of Sn96.5 Ag 3Cu0.5(RoHS material) at 240~245℃ and Sn63pb37(non-ROHS material) at 235±5℃ along the axis direction for 2~3s, the body is 1.5mm away from the molten solder, and then observe with a 3-10 times magnifying glass. The immersed part should be bright and smooth, allowing only a small number of scattered defects such as no pinhole infiltration or weak infiltration, and these defects do not appear in the same location.
Five, detection of light touch switch insulation resistance
The voltage DC250±15V is applied between the contacts adjacent to the switch and between the contacts and other metal parts, and the measurement error should not be greater than 10%. Insulation resistance should be greater than 100MΩ
Six, test the light touch switch resistance to welding heat
After dipping the sample pin into the flux, immerse the sample pin into the molten solder tank of 265±5℃ Sn96.5 Ag 3Cu0.5(RoHS material) and 260±5℃ Sn63pb37(non-RoHS material) for 5±0.5s along the axis direction, and the body is 1.5mm away from the molten solder. The switch should be able to withstand the welding heat test, after the test, under normal conditions to recover for 30 minutes, the switch should be able to operate, the circuit conversion should be normal, the pin should have no mechanical damage, the appearance should not be significantly changed.
Seven, detect the light touch switch pin strength
Take one pin of the switch so that the sample is in the normal installation position, and apply a 9.8N pulling force along the pin axis for 10±1S. After the test, the pin should not fall off, damaged, the switch should be able to operate.
Eight, detect the appearance of the light touch switch size
The parts of the touch switch are processed well, and the surface is free of rust, oil and other visible damage; Pin plating good, no rust, no oxidation, no break, no bending; The key part should be smooth, no burrs, no bumps, and firmly combined with the body without loosening; The number or letter identification on the surface of the switch is clear and complete. The structure, installation size and outline size of the switch should meet the requirements of the component specifications, and the tolerance of the switch size should be ±0.2mm.
Nine, detect the function of the touch switch
With the rated voltage and rated current specified in the specification, the circuit is checked through the indicator light, and the contact resistance test method can also be used to check. The on-off of the switch should be accurate and clear, the operation cycle switch should be smooth, no stuck phenomenon, and the circuit conversion is normal.
10, Detect the touch switch contact resistance
Use milliohm meter to measure the resistance value of the switch contact when it is connected; When there is a dispute, add DC 20mV(open circuit electromotive force of the test circuit), 100mA, measure the voltage drop at the leading end, and calculate the contact resistance. Touch the switch ≤0.03Ω
