12
The microprocessor controls the dosimeter’s operating modes, backlight driver,
audible alarm driver, infrared communication channel, LCD, non-volatile memory, high-
voltage power supply of the detector, operates the control buttons, performs all the
necessary calculations, self-diagnostics.
The dosimeter’s operating algorithm ensures continuity of the measurement
process, statistical processing of the measurement results, a prompt adaptation to the
variation of level of the photon radiation dose rate (setting the time of measurement in
inverse dependence on the dose rate) and effective output of the information obtained to
the LCD. The IR-communication channel provides an exchange of information with PC.
The dosimeter has an internal non-volatile memory that allows the information
accumulation and storage.
Seco
ndary power supply provides transformation of the battery’s voltage 1.5 V into
a stable voltage 3.0
V necessary for the dosimeter’s power supply.
1.4.2 The Dosimeter is designed as a unit housed in a plastic shock-proof case.
General overview of the dosimeter and its parts are shown in Figure 1.2. Indication
elements, positions
1
4
, are on the LCD (
8
).
1
– DER analog scale (seven segments) for effective control over radiation
situation, analog scale (four segments)
– sound pressure level indicator in the search
mode;
2
– DER digital panel in DER measurement mode, DE in DE measurement mode,
year of production in the dosimeter’s number indication mode, indication of IR
communication channel switch on/off in the PC communication mode;
3
– digital panel of indication of statistical error in percents in DER measurement
mode, DE accumulation time indication in thousands of hours (h) in DE measurement
mode, month of production in the dosimeter’s number indication mode;
4
– digital panel of indication of time of averaging DER values (in seconds) in DER
measurement mode, of DE accumulation time in DE measurement mode;
5
– the
(
LIGHT/SET
)
button for switching on LCD backlight, switching on PC
communication mode, entering the set mode and exiting it;
6
– the
(
MODE
)
button for selecting the dosimeter’s indication mode (DER, DE,
the dosimeter’s number, PC communication);
7
– light alarm outlet;
8
– LCD;
9
– IR-transceiver window;
10
– detector;
11
– screw-cover of battery compartment.
A direction of calibration and the detector effective center relative to which the
factory calibration is performed are placed at a 15 mm distance from the dosimeter
detector’s surface (Attachment C).
The total surface density of the walls surrounding the detector is 1 g/cm
2
that
provides the detector shielding from the background beta radiation.
РМ1621М and РМ1621МА dosimeters are equipped with removable clip to be worn
on belt. See Figure 1.3 for the way to demount the clip from the dosimeter body.
Dosimeter can be supplied with protective case made from synthetic fabric so that
user can wear it on the belt. Polimaster recommends demounting the clip when wearing
dosimeter in protection cover.
Summary of Contents for PM1621
Page 1: ...X RAY AND GAMMA RADIATION PERSONAL DOSIMETERS 1621 Models 1621 1621 1621 1621 OPERATING MANUAL...
Page 13: ...13 Figure 1 2 General overview of the dosimeter...
Page 14: ...14 Figure 1 3 Demounting the clip from 1621 and 1621...
Page 21: ...21 Figure 2 2 Select the 1621 1621 dosimeter operating indication mode...
Page 22: ...22 Figure 2 3 Setting the DE threshold values...
Page 23: ...23 Figure 2 4 Setting the DER threshold values...
