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3B Scientific Digital Counter with Interface (230 V, 50__60 Hz) User Manual

Page 3

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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, indi-
vidually selectable in
each function if rele-
vant

Frequency
Range:

0.01 Hz – 99,9 kHz

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 fol-
lowed by 5 s pause;
counting for 10 s con-
tinuous

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
channel

Pass / Run time
Range:

0.01 ms - 100 s

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

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

approx.

Weight:

5 kg approx.


5. Operation

The instrument is powered by activating the
switch marked ‘POWER’.
Immediately on power-on the instrument dis-
plays 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 po-
larity. Push the ‘START/STOP’ to store the se-
lection in memory.

List of the functions and measurement me-
thods:

Function

Select

Description

FRE-
QUENCY

Continu-
ous

When button
‘START/STOP’

is

pressed, frequency
is continuously
measured

Single
measu-
rement

When button
‘START/STOP’

is

pressed, a single
measurement is
started

Pendulum
continu-
ous

When button
‘START/STOP’

is

pressed, a pendu-
lum’s freq. is con-
tinuously measured