3B Scientific Digital Input Box User Manual

3B SCIENTIFIC® PHYSICS

Digital Input Box U11377

Instruction sheet

09/08 Hh

1. Safety instructions

• The digital input box must be connected solely

to the “Digital Inputs” socket of a 3B NETlog

TM

unit.

2. Equipment supplied

1 Digital input box
1 8-pin miniDIN connecting cable, length 600 mm
1 Instruction sheet for U11377

3. Description

The digital input box is used for distributing digital
input channels A, B, C and D of a 3B NETlog

TM

(U11300) unit to four 8-pin miniDIN input sockets.
It allows for digital output signals from up to four

sensor boxes (e.g., photo gate U11365, laser
reflection sensor U8533380, and Geiger-Müller box
U11391) to be connected to the 3B NETlog

TM

unit at

the same time.
It is also possible to perform logical operations

using digital inputs A and B via the 3B NETlab

TM

(U11310) software

4. Technical data

Input signals: TTL level
Output signals: TTL level
Connections: 8-pin miniDIN sockets

5. Operation

• Place the digital input box near the

experiment. Example: an air track (e.g.,
U40400 or U40405).

• Position two photo gates (e.g., U11365)

alongside the air track and connect them via
their miniDIN cables to the input sockets A and
B of the digital input box.

• Connect the digital input box via miniDIN

cable to the 3B NETlog

• Configure the two digital inputs A and B to be

linked using 3B NETlab

TM

unit.

TM

(input mode for
“Digital inputs A+B”) and evaluate the results
from the experimental data.

1

6. Applications

Measuring the position, velocity and acceleration of
moving bodies using multiple photo gates.

7. Sample experiment

Measuring the velocity of a body on an air track

Apparatus needed:

TM

1 3B NETlog

U11300
1 Digital input box U11377
2 Photo gates U11365
1 Air track, 1.6 m U40405
1 Set of 4 velocity flags U40426
1 Air flow generator (230 V, 50/60 Hz)

U15425-230

Fig. 2: Measurements of the time interval (number of
timer pulses) for the rider to travel between two points
on the air track

or
1 Air flow generator (115 V, 50/60 Hz)

U15425-115
2 Stand base, 1 kg U13265
2 Stand rods, 100 mm U15000
2 Universal clamps U13255

• Assemble stands by inserting stand rods into

two bases and attach the two photo gates to
them at the desired positions on the air track
(Fig. 1).

Fig. 1: Measuring the velocity of a glider over a given
distance on the air track

• On the 3B NETlog

mode, and in the software of the 3B NETlab

TM

, select the digital input

TM

select the experiment template for measuring
the velocity of a glider on the air track. The
software contains all the necessary instructions
for setting up the calculation.

• Carry out the experiment and evaluate the

result.

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com

Subject to technical amendments

© Copyright 2008 3B Scientific GmbH