5
4
ALARM TONES
The meter provides six different alarm tones. Only one of these can be emitted at a
time. These alarm tones and their meanings are described below in order of
importance:
Meaning of tone
Timing
Duration
1. Battery voltage too low.
- - - - - - - - - - - - - - - -
5 seconds
2.
Radiation level exceeds measurement range
.
––
––
––
––
…
continuous
3. Dose rate alarm level.
- - - - - -
…
continuous
4. Cumulative dose alarm level.
––
––
...
continuous
5. Button pressed.
-
single beep
6. Radiation pulse detected.
-
single beep
The symbols used in the timing chart above have the following meanings:
-
=
tone
=
pause
...
=
sequence repeats
5
SPECIAL DISPLAY MESSAGES
:
Low battery voltage warning. Appears in the display when the battery voltage
drops below a certain level. This indicates that the meter will operate for only fifty
more hours at the most, and that the battery should be replaced with a new one as
soon as possible. If the battery voltage continues to drop the meter will emit an
alarm tone for 5 seconds then switch itself off. This is done to ensure that data is
retained in memory, and in the case of NiCd batteries, to prevent complete
discharge of the battery.
OFL
Out-of-range warning. This message will appear in the display when the dose rate
exceeds the meter’s measurement range. An alarm tone is also emitted.
xxE3
When the dose rate exceeds 9999 µSv/h it will be displayed in exponential mode in
integer units of one thousand. For example, a dose rate of 55000 µSv/h will be
displayed in the form 55E3.
Auto
See section on measurement mode selection.
Fast
See section on fast measurement.
h/H
See section on precision measurement.
The meter executes a self-diagnostic routine to detect possible fault situations. If a fault is
detected the meter displays an error message consisting of the letters ‘Er’ followed by a
number. All error messages except Er1, which remains in effect until the fault has been
corrected, can be cancelled by pressing any function button.
The error messages are described below:
Summary of Contents for DGM-1500 Turva
Page 1: ...Manual DGM 1500 Turva Personal Survey Meter Made in Finland...
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