Geiger-Müller Counter 513610
AC513610
p
. 6/8
Connections
Connect either a GM tube (BNC connector) or a
GM sensor with integrated electronics (¼” Jack).
An ordinary GM tube is the natural choice, but if
you have a GM sensor, it may also be used.
The counter's GM voltage adjustment has only
effect for the BNC input. A GM sensor with ¼” Jack
has its own high voltage supply.
Pulse Out delivers an approximately 50 μs long
5 V pulse when the counter detects a GM pulse.
The matching cable (512560 – not incl.) ends up in
a ¼” Jack, which can be connected to counter
200250 or Pasco digital adapter PS-2159.
The communication port requires a special USB
cable (512565 – not incl.) and an associated driver.
See section
Communication with a Computer
.
The power supply input may be connected to a DC
adapter (option) if you want to save the batteries.
Time
Set the counting period by using the buttons
and
, until the arrow next to
Time
flashes.
Press
and set the time with
and
. An
arrow at the top of the display shows the time to
be selected when pressing
.
Pressing
when at 300 s or
when at 1 s, the
arrow disappears - this means manual start/stop.
The current counting period is
not
changed before
the final
press. Any ongoing counting
continues in the background.
If possible, an ongoing measurement will continue
after pressing
until the
new
period expires.
This will fail when you choose a time that has
already expired. If the measurement in this way is
invalid, the display will be reset.
When a measurement with fixed time is under
way, the horizontal bar next to
Time
will show the
amount of time that has elapsed. The bar stays at
its maximum after the measurement completes.
In repeat mode, however, the bar is reset
immediately as the next measurement begins.
Until a valid measurement is available, a small
hourglass is shown on the display. This applies
when a single measurement is started, and during
the first measurement period in repeat mode.
G-M voltage
The voltage to the GM tube is set by using the
buttons
and
, until the arrow next to
GM
Voltage
flashes. Press
and set the voltage with
and
. The voltage change immediately – not
at the final
press.
The voltage is shown in the main display and can
be adjusted in the range from 300 to 700 V.
When counting simultaneously with adjusting the
voltage, the counts are displayed in the auxiliary
display. This is handy if you want to measure the
GM tube characteristics. Set the counter to single
measurements to read the results easier.
There is a certain, short reaction time when the
voltage increases – and one a little longer when
the voltage is lowered. If you wish to
systematically study the effect of changing
voltage, it is most practical to start at a low voltage
and increase it in small steps.
As mentioned earlier, this setting only applies for
tubes connected to the BNC input.
