1.Automatic telephone technical conditions 2.Circuit board used double-sided epoxy with gold plate 3.high-quality zinc alloy
Introduction
The key group adopted high-quality zinc alloy material, the surface can be a very good anti-corrosion, anti-external damage through copper, nickel treatment.
Circuit board used double-sided epoxy with gold plate, to ensure its superior transmission capacity. Product is suitable for outdoor public pay phone card.
Standard
GB/15279-94 Automatic telephone technical conditions
YDN109-1998 IC card telephone technical requirements and test methods
GB9035 the technical requirements of DTMF telephone-style keypad
Operating environment
Environment temperature below Negative 25 till 55°C
Relative Humidity 10% till 95%
Atmospheric pressure 96 till 108KPa
Technical Data
Buttons conduction resistance less than 100
Buttons conduction pressure 0.5 till 1.8N
Insulation resistance DC 100V more than 50M
Buttons conduction trip 2.5mm 0.5
Dielectric Strength AC 500V/1min
Mechanical life 1 million times
DTMF telephone-style backlight buttons keypad
