12
8
Factory Default Reset.
Automatically resets to Auto
averaging, CPM and mR/hr, and CAL 100.
9 Revision
#.
Displays the software version number.
Interfacing to an External Device
The lower output jack on the left side of the Radalert 100 is a dual
miniature jack that provides a data output that can be used to drive
external devices. You can use it to record the counts on a
computer, data logger, or accumulating counter. Use a 3.5 mm
stereo plug to access this port.
The outputs provide a positive pulse (9 volt peak, 1 kOhm
impedance) each time the Geiger tube detects a count. At the tip of
the plug, the pulse is approximately 1mS wide and is well suited
for chart recorders and audio output. The ring signal is
approximately 80
µ
S wide and is suitable for high speed counting
and RS-232 interfacing.
A cable with an RS-232 connector (capacitor coupled) for an IBM
PC-compatible computer serial port and accompanying software
are available from International Medcom. For 4.5V logic
compatible output, externally connect a 1 kOhm resistor from the
output to ground. A standard stereo or mono headphone can be
plugged directly into the jack. For some types of headphone,
external volume control may be needed.