3B Scientific Millisecond Counter User Manual
3B SCIENTIFIC
Millisecond Counter (230 V, 50/60 Hz) 1012832
Millisecond Counter (115 V, 50/60 Hz) 1012833
Instruction sheet
06/12 SD
®
PHYSICS
1 4-mm-socket “Start”
2 4-mm socket “Stop”
3 4-mm socket “Ground”
4 Power supply socket
5 4-digit display
1. Safety instructions
The millisecond counter conforms to the safety
regulations for electrical test, control and laboratory
equipment as specified in DIN EN 61010 Part 1. It is
intended for use in dry rooms suitable for electrical
equipment or installations.
Safe operation of the equipment is guaranteed,
provided it is used correctly. However, there is
no guarantee of safety if the equipment is used
in an improper or careless manner.
If it is deemed that the equipment can no longer
be operated without risk (e.g. visible damage
has occurred), the equipment should be
switched off immediately.
• Use the equipment in dry rooms only.
• Only operate using the supplied plug-in
power supply.
• Do not exceed the maximum input voltage
of 5 V for the start and stop inputs.
2. Description
The millisecond counter is a compact counter for
measuring times in the millisecond range. It is
particularly well suited for use in experiments with
the free-fall apparatus 1000738. Counting starts
with a signal to the “Start” input and stops on one
to the “Stop” input. Zero calibration is carried out
automatically for each start. Both inputs respond
to a rising edge and feature internal pull-up resistors.
The millisecond counter 1012833 is for operation
with a mains voltage of 115 V (±10%), and the
unit 1012832 is for operation with a mains voltage
of 230 V (±10%).
3. Contents
1 Counter
1 Plug-in power supply
1 Instruction sheet
1
4. Technical data
7. Operation
Inputs:
Connectors: 4-mm safety sockets
7.1 General operation
• Connect a 12 V AC plug-in power to the
Internal resistance
“Start” input: 2.4 kΩ
“Stop” input: 5.6 kΩ
Connect both inputs (1 + 2) to ground (3).
• Opening the “Start” input (1) (disconnecting
Edges for “Start”
and “Stop” inputs: Rising
Trigger threshold for
“Start” input: Low 0...0.5 V, high 1...5 V
“Stop” input: Low 0...1 V, High 2...5 V
Display:
Display: 4-digit LED display
Measuring range: 1...9999 ms
Resolution: 1 ms
Measurement ceases as soon as the “Stop”
input (2) is opened.
The display will go back to displaying zero as
soon as both inputs are connected to ground
again.
Both inputs should be connected via normally
closed switches (see Fig. 1).
Precision: Quartz precision
General data:
Voltage supply: Plug-in power supply
12 V AC, 500 mA
Dimensions: 100x75x35 mm³ approx
Weight: 400 g approx. incl. plug-
in power supply
5. Care and maintenance
millisecond counter (4).
the ground) starts the measurement.
• Before cleaning the equipment, disconnect it
from its power supply.
• Use a soft, damp cloth to clean it.
6. Disposal
• The packaging should be disposed of at
local recycling points.
• Should you need to dispose of the equip-
ment itself, never throw it away in normal
domestic waste. Local regulations for the
disposal of electrical equipment will apply.
Fig. 1 Schematic diagram for connection of the
inputs
7.2 Set-up with free-fall apparatus
Additionally required:
1 Free fall apparatus 1000738
• Connect the inputs (1, 2, 3) of the millisecond counter to the 3 sockets of the free-fall
apparatus making you sure you match all
the colours (see Fig. 2).
• Connect a 12 V AC plug-in power to the
millisecond counter (4).
Measurement starts as soon as the steel ball is
released from the start console and stops when
it hits the trap plate. Zero calibration is carried
out as soon as the steel ball is placed on the
start console. The timer is then ready to carry
out another measurement.
2
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