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2.3.9.2 When the value of the set control threshold is reached, sound signal turns on. It is turned

off in the following cases:

if the value measured within 8 seconds doesn't exceed the set threshold;

at the shutter being opened/closed;

for 20 seconds - if any button is pressed; at that the button function is being operated; after

20 seconds the sound signal will resume.

2.3.10 Turning the display illumination on/off

To turn the display illumination on without changing the operation mode, press the

for a short time. The illumination will turned off automatically in 15 seconds. If within this period the

button is pressed again, the illumination will turn off.

2.3.11 Battery replacement

The dosimeter's power supply voltage is in the range 4 to 1.8 V. The dosimeter can operate

when the voltage drops down to 0.9 V, but take into account that during startup the dosimeter

consumes current of up to 50 mA, and thus fully discharged batteries can not provide the required

starting voltage. The foregoing also applies to the case when one battery is deeply discharged and the

other battery is fully operable.

In the upper part of the display window the residual capacity of batteries is indicated according

to the Table 2.2.

Table 2.2 – Residual capacity of batteries

Symbol

Capacity of

More than

batteries (%)

90 %

When

symbol appears on the display, batteries should be replaced. To replace batteries,

open the battery compartment and insert two alkaline batteries of AA-size in accordance with polarity.

The following batteries can be used in the dosimeter (see Table 2.3).

Table 2.3 – Types of batteries be used for power supply

Typical residual capacity voltage

Type of

battery

90 %

NiCd

2.68

NiMh

2.60

ZnCl

2.74

Alkaline

2.88

CZn

2.64

Please note:

potential and residual capacity depend on the type of batteries and their correct installation;

indicated residual capacity is for reference only, the dosimeter does not take any action if

the potential drops below acceptable limit;

residual capacity is calculated on the basis of measured potential of two tandem batteries,

and thus readings may not correspond to reality due to the deep discharge or malfunction of one of the

batteries.

90÷70 %

(for two batteries)

70 %

50 %

30 %

2.60

2.54

2.48

2.52

2.48

2.44

2.40

2.20

2.00

2.70

2.58

2.40

2.24

2.14

2.02

FVKM.412152.005RE

70÷50 %

50÷30 %

Typical

capacity (Ah)

=10

load

10 %

Ohm

2.30

1.3 ÷ 2.7

2.30

1.8 ÷ 2.4

1.90

0.5 ÷ 0.8

2.20

2.5 ÷ 3.0

1.90

0.3 ÷ 0.6

Less than

30÷10 %

10 %

specific attribute

for GP batteries

Marking

Green case

Marking, golden case

Grey case

button