The instrument consists of photoelectric detection device and tester
Main features
☆Adopts disc adjustment optical filter and diaphragm.
☆Tester has good stability and reliability.
Common FB807A: working voltage of phototube: -2V~0V, -1V~+50V;
Modified FB807A/1: working voltage of phototube: -4.5V~+2.5V, -4.5V~+30V;
Test methods: intersection method, inflexion-point method, and volt-ampere characteristic method.