3. OPERATING INSTRUCTIONS page 11
Model PRM-470B
3.2. SEARCH MODE
After the initial 10 second background countdown, the instrument will automatically go into
search mode. In this mode the display will be steady (not flashing) and will update the display
every second.
There is an internal motion switch in the instrument that will automatically enable the search
mode when the instrument is moved.
This feature can be enabled or disabled with jumper X1 on the PRCB-001 board.
To enable the motion switch, place the jumper between X1-1 and X1-2.
To disable the motion switch, place the jumper between X1-2 and X1-3.
When the motion switch is enabled, each time the instrument is moved, a 15 second timer is
activated. The instrument will stay in search mode until the 15 second timer expires.
The instrument will produce an audio alarm from time to time in a search mode. When
radioactive materials are present, it will alarm more rapidly. This is dependent on the intensity
of the radiation and the sigma switch settings.
3.3. BACKGROUND MODE
The background mode is characterized by the display flashing once per second, and will update
with a new background every 10 seconds. Pressing the mode switch and holding it until it is
acknowledged with a "beep" toggles between search and background modes.
While in background mode the audio alarm is disabled and the display will continue to flash.
