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Press the Select button repeatedly until the Period
LED is lit. After a short time the Continuous LED will
flash and normally you will now press Memory/Con-
tinuous to achieve continuously repeated measure-
ments.
Press the Start/Stop button to start the measure-
ment.
Measurements are stored in the internal memory –
see later.
Frequency
This function is used to determine the frequency of
a simple periodic signal. Electrical sine or square
wave signals connected to pulse input A works fine.
In order to work with audio through a microphone,
the sound must be strong and look like a sine wave.
In other words, the sound should be without over-
tones. Sounds with strong overtone content cannot
be used with this counter.
Press the Select button repeatedly until the Period
LED is lit. After a short time the Continuous LED will
flash and normally you will now press Memory/Con-
tinuous to achieve continuously repeated measure-
ments.
Press the Start/Stop button to start the measure-
ment.
Measurements are stored in the internal memory -
see later.
Counts
This function is typically used when working with ra-
dioactivity. Use input A.
With the Count function, the measurement time in-
terval must be selected. A typical time interval for
demonstration tests and many student labs is 10 s.
Accurate measurements may require longer intervals
like 60 s or 100 s. Even longer time intervals can be
achieved by simply making multiple measurements
and adding the results. If very long measurement pe-
riods are necessary, you can use manual start and
stop.
Press the Select button repeatedly until the Count
LED is lit. Afterwards the Select button switches bet-
ween the possible time intervals. “Start/Stop” means
manual start and stop, the setting “Special” is not
used.
Shortly after you select the measurement period,
the Continuous LED flashes and normally you will
now press the Memory/Continuous to achieve conti-
nuously repeated measurements. Measurements will
be stored in the built-in memory – see later.
Press the Start/Stop button to start the measure-
ment.
When in continuous mode, the counting initially runs
for, say, 10 seconds. Next, the result is displayed for
3 seconds while the next measurement is already
underway. The next 7 seconds of the counting is fol-
lowed ”live”, and then the result is displayed for 3
seconds – etc.
The shortest counting interval leaves no time for
readout, but the data can later be retrieved from
memory.
After a single measurement, the display is reset by
pressing Select once. The unit is now ready for a
new measurement.
A Continuous series of measurements is terminated
by pressing the Start/Stop button. The current mea-
surement continues until the end before stopping.
Instant stop is achieved by pressing Select.
Memory
The functions Collision and Acceleration use the
memory as described previously.
All the other functions continuously save the
results in memory. There is access to browse the
memory when the LED next to Memory/Continuous is
flashing. This requires that a measurement is not in
progress.
Each press of the button Memory/Continuous steps
”backwards” from newest to oldest results. When
you have reached the end, the symbol ”--------” is
displayed; after that the sequence is started over
again.
There is room for 50 numbers in memory, oldest
entries will be overwritten.
Pressing Select resets the memory.
