| 摘要 |
PURPOSE:To reduce the working time required for measuring and recording the level and cant of tracks by amplifying the differential signal between the signal obtd. by passing the output of a level detector through a low pass filter and the output signal of a zero adjuster and displaying the same analogically and digitally. CONSTITUTION:The wheels 18, 18' of a level body 10 are placed to the level and a measuring switch 27 is turned on. The zero point of a level 9 for tracks is adjusted with a zero adjuster 24. The measuring wheels 18, 18' are brought into contact with track rails 17, 17' and are moved to the measuring position, when the switch 27 is turned on. The analog signals of the level and cant of tracks from the detector 16 are inputted through a low pass filter to a differential amplifier 25, which determines the difference thereof from the input signal from the adjuster 24. The differential signal thereof is fed through the amplifier 25 to a display 26, by which the measured values of the level and cant for the tracks are displayed analogically or digitally. The time for measurement is thus reduced. |
