7
1.3 Display and control buttons
The instrument contains the following control and display components:
1. MODE
button
is used for turning the instrument ON; switching between
operation modes; background update (calibration); changing parameters in Setup
Menu.
2. LIGHT
button
is used for switching on the backlight, enabling IR-
communication with PC, changing parameters in Setup mode, turning the
instrument OFF.
3.
IR port, is used for the advanced instrument setup and data download.
4.
Alarm LED.
5.
Battery compartment cover.
6.
External vibrator socket.
7.
Audible alarm buzzer.
8.
LCD.
The LCD of the instrument may display any of the following information:
•
gamma Dose Equivalent Rate
in µSv/h or
µ
R/h;
•
gamma countrate
in counts per second (s
-1
);
•
average statistical error of the measured value
in %;
•
n coefficients
: number of mean square deviations for the gamma threshold;
•
Messages:
"tESt", "CAL", “bAtt” , "OL", "oFF", "bt", etc.;
•
Critical battery discharge
: displayed when the battery voltage drops below
1.1 V.
The analog bar in the middle of the LCD display indicates the time left until self-tests
or the background calibration are completed. In the Search Mode, the bar represents a
relative value of a gamma count rate excess over the calculated alarm threshold (the point at
which the alarm is expected to be set off).
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