Experimental Study on Prevention of Calcium Carbonate Crystallizing in Drainage Pipe of Tunnel Engineering

Table 3

Main functional parameters of the pipe endoscope.

Number	Parameters
(1)	Screen ratio: 16 : 9
(2)	Screen resolution: 800 RGB 480
(3)	Backlight luminance of LED: 300 cd/m^2
(4)	Contrast: 1000 : 1
(5)	View angle range: upper, 50°; lower, 70°; left, 70°; right–70°
(6)	DVR image quality: DVR records CH1/CH2 corresponding video signal
(7)	Compression mode: video compression MOTION JPGE
(8)	Power supply: 12∼24 V DC
(9)	Power: <6 W
(10)	Maximum current: <600 mA