3. OPERATING INSTRUCTIONS page 12
Model PRM-470B
3.4. MODE CHANGE AND RESET
The instrument may be switched between search and background modes at any time by pressing
and releasing the mode switch.
If the internal motion switch is enabled, the modes may be switched by setting the instrument on
a stable platform like a table and waiting for the 15 second timer to expire.
To reset, the instrument must be power cycled. The instrument will go through another self-test
and wait period. It will then display a new background count.
3.5. DISPLAY BACKLIGHT
The display backlight is turned on automatically at power-up. The display backlight will turn off
again when the instrument enters the initial background countdown.
After the countdown starts, and at any other time while the instrument is operating, pressing the
light switch will turn on the backlight for 30 seconds. Excessive use of the light will shorten the
useful life of the battery by up to 50%.
3.6. LOW BATTERY DETECT
The PRM-470B is equipped with an automatic low battery detect circuit.
When the battery voltage drops to 5.2Vdc, all signal processing will stop, the display will show
"LO", and the beeper will sound for five seconds.
The instrument will automatically power down at the end of the five seconds to avoid damage to
the batteries. The PRM-470B will resume normal operation after replacing the batteries.
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