Page 91 - Lehrbuch Neigungsmessung deutsch 2018.indd
P. 91
COMPENDIUM INCLINATION MEASUREMENT
WYLER AG, WINTERTHUR / SWITZERLAND
When a voltage is applied to a capaci-
tor U ,it will be charged until U = U .
A
A
C
The charging and discharging time de-
pends on the size of the capacitance of
the capacitor.
black curve: small capacity
red curve: large capacity
When charging or discharging the ca-
pacitor in achieving the upper and the
lower threshold voltage, the dischar-
ging, or charging procedure begins.
Thus a square wave frequency is visi-
ble, which is produced by a so-called in-
verter. Each loading and unloading pro-
cess corresponds to the period duration
of the frequency F.
Through a 12-bit binary counter, the
process switches from the left electrode
to the right, and vice-versa.
Small distance = Large distance =
large capacity = small capacity =
small frequency large frequency
The illustration on the right shows the
relationship between the inclination of
the sensor, the distance between the
electrodes and pendulum, and the resul-
ting frequency.
U+: positive or upper threshold voltage
U-: negative or lower threshold voltage
Page 91
