7
-
enter the coefficient n setting mode and the audible alarm on/off mode (hold
the button pressed for more than 4 sec);
-
set (decrease) coefficient n in 0.1 steps in the setting mode;
-
switch on/off audible alarm (press shortly for less than 1 s).
16
−
LIGHT Button:
-
turn the instrument off (press and hold the button until the LCD displays
“Off” message;
-
activate LCD backlight;
-
initiate infrared communication with personal computer;
-
activate the coefficient n setting mode;
-
increase coefficient n in 0.1 steps in the setting mode;
-
switch on (Aud on) or switch off (Aud off) audible alarm in the setting mode;
-
switch on (Vibr of) or switch off (Vibr on) headphones alarm in the setting
mode.
LCD indication:
15
−
LCD upper line:
-
count rate in count per second (s
-1
);
-
messages “test”, “CAL”, “Aud”, etc;
-
coefficient n value in the setting mode.
Analog Scale (not shown in the Figure)
−
19 segments:
-
time left until self-tests are complete: segments countdown the test time;
-
time left until background calibration is complete: segments increase as the
instrument calibrates.
Low Battery Indicator (not shown in the Figure)-displayed when voltage
drops below 1.1V.
17
−
LCD lower line:
-
Relative root mean square uncertainty of count rate (statistical uncertainty) in
percent at 0.95 confidential probability;
-
audible alarm on/off.
Block Diagram of the instrument is shown in Figure 2.
The instrument is composed of:
-
detector unit;
-
processor unit;
-
audible alarm (headphones);
-
power supply unit.
