FPM-3220 User’s Manual 30Appendix B Optional TouchscreenB.1 SpecificationsElectricalOperating Voltage: 3.3 to 5 VDC typicalSheet Resistance: 350 ± 22% W/squareLinearity: +/- 1.5% full scale linearity error in eitherdirection.Insulation Resistance: > 20 ΜΩ @ 25 V DC.OpticalTotal light Transmission: 75% typical (> 74% @ 550 nm test)EnvironmentalOperating Temperature Range: -20°C to +50°C, 2 weeks at 50°C/90%RHStorage Temperature High: +70°C, 240 hours at ambient humidityStorage Temperature Low: -40°C, continuous at ambient humidityAccelerated Aging: 100 hours continuous exposure at60°C/95% RHThermal Shock: 25 cycles (one cycle is 30 min. dwellalternating from -40°Cto +85°C with less than 10 min. transfer time).MechanicalActivation Method: Gloved or ungloved fingerDelrin or plastic stylus (no metal) with1mm radius full hemispherical tipActivation Force: < 25 g average with non-metal stylus< 50 g average with 5/8” diameter silicone finger