MECHANICS
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31
Photocell unit
This item is for measuring pendulum
swings, time measurements on the air
track, measurements of rota tion rates,
etc. The unit consists of a photocell
which receives light transmitted from a
light emitting diode (LED) through a 1
mm aperture. Next to the light source
LED and next to the photocell red and
green LED’s are mounted to indicate
whether a signal is reaching the photo-
cell from the light source and whether
the light source is on. The photocell unit
is provided with two 6-pole DIN-conne-
c tors for connection to electronic coun-
ter type 2002.50 and extension to addi-
tional photocell units if additional sig-
nals are to be connected to the same
input on the counter. They are made of
impact-resistant plastic and provided
with threads for vertical or horizontal
mounting with the 10 mm diameter
mounting rod (also supplied). Supplied
1975.50
with a connection cable to the electro-
nic counter. Maximum distance bet -
ween the photocell and the LED: 90
mm.
Width: 160 mm, height: 120 mm,
thickness: 28 mm. Mass: 450 g.
1975.50 Photocell unit incl. cable
and mounting rod
Photocell unit
Used for timing on the air track. The unit is made espe-
cially for mounting on air track no. 1950.10. Provided
with slide indicator and plugs for 2002.50.
1975.15 Photocell unit
1975.15
®
Science Equipment for Education Physics
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