23 MN1007-C
4.3.2 cps Minus Background Mode
Press the Mode
key to change the measuring units from cps to cps minus background mode.
The display shows a bar graph as well as digital readout. The measurement units and mode are indicated by the
“cps” and “– Background” text.
In this mode the digital display will show the cps count rate with the last stored background count subtracted.
Figure 6 - Background subtracted CPS screen
The value subtracted for background cps will be that held in memory by the instrument. The operator may update
the background value at any time. [See section 4.7]
Stored background counts are held for each probe type. If the SA50 scintillator probe and SA49 GM probe are
interchanged, the corresponding background reading for that probe type is automatically loaded and used in
the background subtraction calculation.
4.3.3 Dose Rate Mode
Press the Mode key to change the measuring units from cps minus background to Dose Rate mode
The screen will show the analogue scale and digital display in µSv/h units. If the instrument has been configured for
use in the USA then these units will be displayed in µR/h.
Figure 7 - Dose Rate screen with SI units
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General