PASCO ME-9204B ACCESSORY PHOTOGATE - Manual (Page 3)

3
012-06375A Accessory Photogate
®
GND
Signal
+5VDC
Stereo Phone Plug
NOTES:
• The actual length of an object passing through
the photogate may be slightly different than the
effective length seen by the photogate. To deter-
mine the effective length, push the object
through the photogate, and measure the distance
moved by the object from where the LED first
comes ON to where it goes off. Use this effec-
tive length, rather than the actual length, in cal-
culations. For example, if you were measuring
the speed of the object, you would divide the
effective length by the time during which the
object blocked the photogate beam.
• A stereo phone plug extension cord, such as
PASCO Model PI-8117, will increase the sepa-
ration between the photogate and the timer.
Experiments
Refer to the experiment guide that comes with your
PASCO equipment (e.g., Introductory Dynamics Sys-
tem).
Photogate Specifications
Detector rise time: < 500 ns
Detector fall time: < 50 ns
Parallax error: For an object passing within 1 cm of the
detector, with a velocity less than 10 m/s, the difference
between the true and effective length is less than 1 mm.
Power requirements: 5 VDC ± 5% at 45 mA.
Infrared source: Peak at 880 nm.
Photogate with Pendulum