PRM-7000 / 8000 / 9000 Users Guide | 7
3. Using The PRM Instrument For The First Time
This section provides some basic operations most new users will want to perform before
using the PRM Instrument.
3.1 Powering On the PRM Instrument
Press and hold down until the start up message and serial number is displayed on
the LCD. After approximately three seconds the unit will default to the home screen and
begin displaying the current measurement. The unit will beep every time it detects an
ionized radiation particle.
This detection is normal everywhere as background radiation exists everywhere. Your
particular background radiation level is dependent on many factors including altitude. For
example, in Castle Rock, Colorado a normal background radiation measurement is 0.022
mR/hr while in Miami, Florida a normal background radiation measurement would be in
the 0.012 mR/hr range. For comparison, on an airplane, at cruising altitude of 40,000
feet, a typical reading would be in the vicinity of 0.400 mR/hr, or approximately 180
beeps per minute for the PRM-7000, 400 beeps per minute for the PRM-8000, or 1,400
beeps per minute for the PRM-9000. Additional information on background radiation and
its measurement using the PRM Instrument can be found in the Users Guide, section
14.1 “Determining Background Radiation.” For more information on radiation units see
the Users Guide, section 15.1 “Units.”
3.2 Muting The Beeper
The beeper is a vital indicator on the PRM Instrument. Changes in the rate of beeps will
be the fi rst indication of a radioactive object or area. However, it is oftentimes desirable
to mute the beeper. To mute the beeper:
1. If the Display is off (power saving mode), press any key to wake up the
PRM Instrument
2. Press
to display the “Main Menu”
3. Press
two times to display the “Settings” menu
4. Press
to select the “Settings” menu
5. The fi rst setting displayed is the beeper and the factory default is
“Beeper: Medium”
6. Press
to rotate through the beeper settings until you reach “OFF”
7. Press
to move back to the “Main Menu” and press again to return
to the Home Screen
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