Main technical parameters of the luminescent vacuum indicator IV-4:
• Sign size: 12 x 18 mm;
• Glow brightness: no less than 500 cd/m2;
• Number of segments: 18;
• Filament voltage: 2.21...2.86 V;
• Grid voltage: 25...27 V;
• Voltage of anode segments: 25...27 V;
• Glow current: 45...55 mA;
• Grid current: no more than 6 mA;
• Current of anode segments: no more than 0.5 mA;
• Ready time: no more than 1 s;
• Minimum operating time: 2000 h
Color green.