3B SCIENTIFIC PHYSICS 1001032 Manual De Instrucciones página 5

2. Description
The electronic counter/timer is able to measure
time, frequencies, rates and periods as well as
counting events or pulses from a Geiger tube.
When counting events, it is possible to set cer-
tain fixed periods of time for the count. In addi-
tion, an arbitrary time period anywhere between
1 s and 99999 s can be programmed.
Counting can be triggered (started or stopped)
either by a signal to the input terminals or man-
ually by means of a switch.
3. Technical data
Operating voltage: 12 V AC, 300 mA via plug-
in power supply
0.5 V ... 15 V AC
Input (9):
Triggering edge L/H
1 V ... 15 V AC
Input (7):
Triggering edge L/H
Display: 5-digit LED display
Geiger tube input: 500 V at 300 M
Frequency ranges: 1 ... 100 Hz, 1 ... 100 kHz
Time periods: 1/10/60 s or manual set-
ting 1- 99999 s
Dimensions: 250 x 100 x 160 mm
Weight: 0.9 kg approx.
4. Operation
Note:
The counter has no separate on/off switch.
Power is turned on simply by plugging in the
power supply.
If there is a malfunction, disconnect the equip-
ment from the mains for a few seconds.
4.1 Time measurement
The measurement can be triggered by signals
applied to terminals 9 and 7 or by pressing a
button manually.
Set selector switch (15) to t

4.1.1 Manual trigger

Press the "Start" button (3) and the timer will
start counting.

Press the "Stop" (2) button and the timer will
stop counting.

Press "Reset" (1) to set the timer back to
zero.
(ms or s).
AB
2
4.1.2 Via signal (light barrier 1000563)

Connect one light barrier to socket A (12).

Connect a second barrier to socket B (14).
When light barrier A triggers, the timing starts.
Timing stops upon triggering of barrier B.
4.1.3 Via signal (e.g. free-fall apparatus
1000738)

Connect the free-fall apparatus via sockets
(9), (7) and (11). (Observe colour coding of
terminals).
The timer starts counting when the steel ball is
released from the free-fall apparatus and stops
automatically when the ball strikes the contact
plate at the bottom.
4.1.4 Time that a light barrier is obscured
 Connect sockets "Out Start" (8) and "In
Stop" (7) together using experiment leads.

Connect a light barrier to socket A (12).
The period to be measured is the length of time
that a moving body takes to move through the
light beam. Its entry into the beam obscures the
receptor and starts the timer. When the body ex-
its the beam, the receptor detects the light again
and the timer is stopped.
4.2 Periods of a pendulum

Set the selector (15) to the symbol T

Apply an input signal to terminal (9) or con-
nect a light barrier to socket A (12).

Press the "Start" button (3).
The time to be measured is the number of milli-
seconds between successive low-to-high (L/H)
edges detected at terminal (9) or three interrup-
tions to the light beam detected at terminal A
(12).
4.3 Counting periods
4.3.1 Fixed periods:

Set the selector switch (15) to the desired
period (N 1/10/60 s).
A

Apply an input signal to terminal (9) or con-
nect a light barrier to terminal A (12).

Start counting by pressing the "Start" button
(3).
The equipment counts L/H edges at terminal
(9), pulses from a Geiger tube connected to ter-
minal (10) or interruptions to a light barrier con-
nected to terminal A (12).
.
A