2.2.4 Switching the dosimeter OFF
To switch off the dosimeter, enter "SETTINGS", press "NEXT" to go to "POWER OFF"
and press "SELECT", then press "YES" to confirm (Figure 2.4).
Figure 2.4
2.2.5 DER measurement mode
The dosimeter enters the DER measurement mode ("DER") automatically upon power on.
In this mode the dosimeter can measure:
- DER of continuous photon radiation;
- average DER of pulsed radiation.
2.2.5.1 Measurement of continuous photon radiation DER
While in the DER measurement mode ("DER") the dosimeter’s LCD indicates continuously
measured DER values of photon radiation in "Sv/h", "mSv/h", "Sv/h", statistical uncertainty of
DER indication in percent with 0.95 probability, status of the rechargeable battery (icon) and
current time in hours and minutes (Figure 2.5).
Figure 2.5
The DER values can be read when the statistical uncertainty is 15 % and less.
Attention! Please remember that the lower the statistical uncertainty is, the more
accurate the measurement result is.
It is possible to re-start DER measurement in this mode. Press "START", then "1" button
(line "1 – DER") and the current DER value will be zeroed and the measurement will re-start.
The dosimeter monitors two settable alarm thresholds for the DER (2.2.7.5). When the DER
alarm threshold (Threshold 1 or Threshold 2) is exceeded, the dosimeter goes to the DER
measurement mode, indicates "THRESHOLD 1" or "THRESHOLD 2" on the upper line and
triggers enabled sound (intermittent signal for threshold 1 and rapid intermittent signal for threshold
2), light and vibration alarms (2.2.7.6). Press any key to switch off the alarms. The alarm is
triggered again when the DER level becomes lower than one of the thresholds and threshold 1 or
threshold 2 is exceeded again.
If the DER indication range is exceeded, the dosimeter triggers an alarm and the LCD
indicates "OVERLOAD" and value 12.0 Sv/h.
2.2.5.2 Measurement of average DER of pulsed radiation
It becomes necessary to measure average DER of pulsed radiation when the user is exposed to
pulsed photon radiation at pulse duration more than 1 ms.
Measurement of average DER of pulsed radiation can be started from the DER measurement
mode. Press "START", then press button "2" (line "2- AVERAGE DER OF IMP EXPOSURE"), the
DER values will be zeroed and the dosimeters will start measurement of average DER of pulsed
radiation ("AVERAGE DER") (Figure 2.6).
The average DER of pulsed radiation can be read when statistical uncertainty is 15% or less.
Measurement of the average DER can be continued for unlimited time to reduce statistical
uncertainty for more accurate results. Press "BACK" to exit the average DER measurement mode.
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