WAVES, VIBRATIONS AND SOUND
::
51
Electronic counter
This microprocessor controlled 8-digit counter is desig-
ned for the measurement time intervals, periods of oscil-
lation, rpm, frequency and for pulse counting, etc. The
unit of measure is displayed, and it is possible to divide
the display into two by 4 digits.
There are start/stop terminals for connecting micro -
phones, photocell units, free fall equipment, etc.
There is a connection terminal for GM counters for mea-
suring radioactivity with selectable gate times.
The counter is provided with an easily read LED display
and a logically designed control panel. This makes the
counter well-suited for demonstration experiments as
well as for student laboratory exercises.
The counter has memory for storing measured values as
well as an RS232 serial output for computer interfacing.
Time measurements can be made down to 1 ms, and
frequencies up to 2 MHz can be measured.
2002.50 Electronic counter
Pendulium experiments.
See additional specifications on page 17.
Compatible
1975.50
Experiment
E-1
02
Photocell unit
The unit is suitable for the measurement of pendulum peri-
Measuring the speed of sound.
ods, time interval measurements for experiments on an air
track, measurements of periods of rotation, etc. The unit
consists of a photocell which is illuminated via a one milli-
meter aperture by light from a light emitting diode. A red LED
(light emitting diode) is provided next to the light source to
indicate that the light source is on. A green LED near the
photocell indicates when the receiver is illuminated. The
2482.00
photocell unit is provided with two 6-pole DIN-connectors
for connection to the electronic counter no. 2002.50 and
serial connection to additional photocell units, when signals
are to be sent to the same input connection on the counter.
The unit is manufactured in rugged plastic with threads for
horizontal or vertical mounting using the 10 mm diameter
Clapper board mounting rod provided. A connector cable for the electronic
This clapper board is ideal for producing the sharp sound
counter is also provided. The maximum distance between
pulse required for measuring the speed of sound.
the photocell and the light source is 90 mm. Dimensions:
Produced with two hinged hardwood blocks.
B x H x D: 160 x 120 x 28 mm. Mass: 450 g.
Dimensions: 27 x 50 x 300 mm.
1975.50 Photocell unit including cable and
Mass: 280 g.
mounting rod
2482.00 Clapper board
®
Science Equipment for Education Physics
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