PRM-7000 / 8000 / 9000 Users Guide | 9
4. Home Screen
The Home Screen provides the user with the ability to quickly access measurement
information with a single key press. The
and keys allow the user to scroll
through various displays as indicated in the table below. Pressing the
key turns the
LCD backlight on and off.
Home Screen Operation
Toggle Backlight On and Off
or
Move up and down through the seven screens:
1. Current Measurement (Section 4.1)
2. Average Measurement (Section 4.2)
3. Maximum Measurement (Section 4.3)
4. Minimum Measurement (Section 4.4)
5. Total Count Measured (Section 4.5)
6. Time/Date of Maximum Measurement (Section 4.6)
7. Current Time and Date (Section 4.7)
8. Elapsed Time Since Power Up, or Reset (Section 4.8)
Select Main Menu
This Home Screen and the recording of the measurements indicated above has been
implemented in the PRM Instrument specifi cally to provide the user with a complete as-
sessment of the radiation level of the environment where the monitor is located.
While powered on and even in sleep mode, the PRM Instrument is constantly record-
ing this information and doing so while preserving battery power. The following sections
provide additional detail on the screens.
4.1 Current Measurement
This display indicates the current radiation measurement in the chosen measurement
units. The user can select microrems per hour (μR/hr), millirems per hour (mR/hr),
microSieverts per hour (μSv/hr), Counts per Second (CPS) or Counts per Minute (CPM).
The default unit of measurement is mR/hr.
While powered on, the PRM Instrument takes measurements every second. At low
levels of radiation (less than 6.00 mR/hr) these measurements are averaged across the
number of seconds as determined by the Low AvWin setting.
The default setting is 20 seconds. In this setting the display will update with the average
of the last 20 seconds of measurements. The setting can be changed to enable a quicker
(shorter averaging period) response time at low levels.
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