3B Scientific Digital Counter with Interface User Manual
3B SCIENTIFIC® PHYSICS
Digital Counter with Interface (115 V, 50/60 Hz) 1003122
Digital Counter with Interface (230 V, 50/60 Hz) 1003123
Instruction sheet
09/12 ALF
1. Safety instructions
The counter conforms to safety regulations for
electrical measuring instruments and control and
laboratory equipment as per DIN EN 61010, part
1. It is intended for operation in a dry environment,
suitable for the operation of electrical equipment
and systems.
Safe operation of the counter is guaranteed,
provided it is used correctly. However, there is
no guarantee of safety if the counter is used in
an improper or careless manner.
If it may be assumed for any reason that nonhazardous operation will not be possible (e.g. visible damage), the counter should be switched off
immediately and secured against any unintended
use.
• Before using the counter for the first time,
confirm that the specifications printed on the
rear side of the housing are compatible with
the local mains voltage.
• Replace a faulty fuse only with one matching
the specifications stated at the rear of the
housing.
• Disconnect the counter from the mains be-
fore replacing a fuse.
• Never short the fuse or the fuse holder.
2. Description
The digital counter with interface is a microprocessor based counter. It was specially designed for the
education in Physics.
The instrument has the following functions and
measuring modes:
Frequency counting
Period measurement
Impulse counting
Start A - Stop B
Pass times
Run + Pass times
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The digital counter with interface can be used as a
stand-alone instrument or together with a Personal Computer. A Windows programme for
operation and data logging from the instrument
is supplied with the instrument. Also a cable for
connecting the counter and the PC serial port
(COM-1 or COM-2) is supplied.
The Geiger-Müller amplifier module is as standard supplied with the counter.
The counter with the order number 1003123 is
for mains supplies of 230 V (±10%) while the one
with order no. 1003122 is for 115 V (±10%) systems.
3. Operating controls and connections
Front panel
POWER
On / Off contact
FUNCTION
Push button for selection of function. Push
to select next.
SELECT
Push button for selection of measuring
method, and for use
with display of results
START/STOP
Push button to start
and stop of measurement
Hz LED for indication
of measurement in Hz
kHz LED for indication
of measurement in
kHz
s LED for indication of
measurement in seconds
ms LED for indication
of measurement in
milli seconds
4-digit LED-display for
results
2x16-character LCDdisplay for function,
selection, setup etc.
A LED
indicator for input A
B LED
indicator for input B
IMPULSE Electrical
impulse input A
IMPULSE Electrical
impulse input B
SWITCH
Electro/mechanical
switch input A
SWITCH
Electro/mechanical
switch input B
PHOTO/MIC
mini-DIN8 socket for
connection of photo
gates or microphone
PHOTO/MIC
mini-DIN8 socket for
connection of photo
gates or microphone
Rear panel
Mains connection 230 V or 115 V AC 50/60 Hz
Mains fuse (0.5 AT)
RS232 interface to PC
für PC
GM
BNC-connector for
Geiger-Müller tube
GM VOLTAGE
Voltage regulation
potmeter for the Geiger-Müller tube.
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4. Technical data
Input A and B
Input impedance: 500 kΩ
Sensitivity: 200 mV
Trigger polarity: positive going or
negative going, individually selectable in
each function if relevant
Frequency
Range: 0.01 Hz – 99,9 kHz
Hint: Voltage can be measured with a 10 MΩ
multimeter, and multiplied by 2.
General data
Mains connection:
1003122: 115 V (±10 %), 50/60 Hz
1003123: 230 V (±10 %), 50/60 Hz
Power consumption: 20 VA approx.
Dimensions: 95x245x185 mm
Weight: 5 kg approx.
Resolution: 0.01 Hz - 10 Hz
Method: continuous / single
measurement
Period
Range: 0.01 Hz – 99.9 kHz
Resolution: 0.01 ms - 10 ms
Method: continuous / single
measurement
Impulse count
Range: 0 - 9999 impulses per s
Resolution: 1 impulse
Method: continuous;
counting for 1 s; 6 s; 10
s and 60 s;
counting for 10 s followed by 5 s pause;
counting for 10 s continuous
Start A - Stop B
Range: 0.01 ms - 100 s
Resolution: 0.01 ms
Pass time
Range: 0.01 m - 100 s
Resolution: 0.01 ms
Method: simultaneous on both
channels
Memory: up to 9 times per
The instrument is powered by activating the
switch marked ‘POWER’.
Immediately on power-on the instrument displays the version number (i.e. ‘r 1 1.00 .00 .00’
for approx. 2 secs.).
The counter is now ready for use.
The selected function and method of measure-
ment are shown in the LCD-display.
To change language turn off the power, hold the
‘SELECT’ and simultaneous switch on the power.
Use the ‘SELECT’ button to change the lan-
guage, press ‘FUNCTION’ to store the selection
in memory.
Select a function with the push-button ‘FUNC-
TION’ and then the measuring method with the
pushbutton ‘SELECT’.
If the selected function has the option to select
the trigger polarity, then a simultaneous push on
‘FUNCTION’ and ‘SELECT’ displays the trigger
polarity in the LCD-display for each input.
Pushing the ‘SELECT’ changes the trigger polarity. Push the ‘START/STOP’ to store the se-
lection in memory.
List of the functions and measurement methods:
Function Select Description
channel
Pass / Run time
Range: 0.01 ms - 100 s
FREQUENCY
Resolution: 0.01 ms
Method: first pass time on A,
then pass time on B
Memory: one set of measure-
ments (run time A to
B, pass time A and
pass time B)
Geiger-Müller amplifi er module
Anode resistor: 10 MΩ (Ri)
GM voltage range: 325 – 650 V DC con-
tinuously adjustable
5. Operation
Continuous
Single
measurement
Pendulum
continuous
approx.
When button
‘START/STOP’ is
pressed, frequency
is continuously
measured
When button
‘START/STOP’ is
pressed, a single
measurement is
started
When button
‘START/STOP’ is
pressed, a pendulum’s freq. is continuously measured
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