29 MN1007-C
4.7 Background Measurement
It is good practice to update the background value held in the instrument at regular intervals; particularly where
there has been a significant change in the environment where monitoring work is being carried out; or where the
operator is uncertain of the value held in memory.
The measurement takes 60 seconds and thus provides a statistically accurate count value for use with background
subtraction measurement modes.
If using more than one probe type, ensure that a background reading is taken for each type (ie SA50 & SA49).
Press the Log Back-ground key. The display will begin to flash indicating that a background measurement is in
progress. The data presented represents a running average of the current measurement.
Figure 16 - Background measurement
After a period of one minute the monitor will cease counting and the new background value in cps (or cpm) will be
displayed. The operator can accept this value or repeat the count by pressing the Log Back-ground key once
more.
Press the Rate/Int./Stop
key to accept the new reading and automatically update the value held in memory.
The instrument will then return to its previous measuring mode.
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General