Description The GVA50 optical variable attenuator is designed for optimal flexibility and field usability,Website:http://www.greentelfttx.com,the GVA50 delivers the highest performance within handheld optical attenuator on the market, it is an ideal tool for telecom technicians to do the pre-test before the maintenance.Features ● Compact and rugged portable design● Three wavelengths: 1310nm / 1490nm / 1550nm● Different attenuator range, 40dB, 60dB or 80dB● Can save current value as reference● Can save 10 tracks attenuation value● Memorize the value after instruments shut down● Energy save mode● One-year warranty and three-year recommended calibration intervalSpecification Optical Variable Attenuator - GVA-50 Parameter ModelGVA50-40GVA50-60GVA50-80Attenuating Range40dB(SM)60dB(SM)80dB(SM)Calibrated Wavelengths1310nm / 1490nm / 1550nmFiber Mode9/125um Attenuating ModeDigitalDisplay Resolving Power0.1 dBDisplayLCD, 128*64Max Input Power+ 28 dBmReturn Loss*>40 dBInsertion Loss*< 2.5 dBOptical ConnectorFC/PC (or customize other connectors)Uncertainty+/- 0.5 dBRepeatability*+/- 0.2 dBAuto Power OffNo operation in 10 minutes (can be canceled), Low battery energyBattery ChargeYesOperate TimeAbove 20 hoursPower Supply3 * AA batteries or AC/DC adapterSize(HxWxD)190mm *90mm * 40mmWeightAbout 450gStorage Temperature-20  to  +70  ℃ ,<90% RHOperating Temperature-10  to  +50  ℃ ,<90% RH* at 20±3℃, CW, with FC/PC connector,1550nmStandard Package①GVA-50 main body*1②Nylon bag and the Q/C certificate*1③Operation Manual*1④Paper BoxOrdering InformationGVA50-XX(1)GVA50-40: Attenuation Range:40dB(2)GVA50-60: Attenuation Range:60dB(3)GVA50-80: Attenuation Range:80dB