MGP WRM2 Especificações descarregar pdf (Página 35)

15-00044

Revision 5

April 2008

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is stored and the display is showing the net rate.

3. Connect the meter to PC (using the null modem adapter) and run the RMV software, in the Amp setup

function type desirable ‘9999’ the background value.

8. Calibration Summary for the DRM-1/2

8.1 Preface

8.1.1 Calibration Factors

To improve the linearity, the DRM-1 includes five calibration factors: The two lower factors are for the low

range GM tube, from 0.01 mR/h to 800 mR/h; and the other three are for the high range GM tube, from 600 mR/h

to 1000 R/h. Once the F factors have been set a linearity verification should be performed on all ranges.

The calibration factors will be set using the RMC software:

F1 - first calibration factor for low range.

F2 - second calibration factor for low range.

F3 - first calibration factor for high range.

F4 - second calibration factor for high range.

F5 - third calibration factor for high range.

• F1 and F3 are used to compensate the GM tube sensitivity tolerances.

• F1 for the low range (ZP1201) and F3 for the high range (ZP1301).

• F2, F4 and F5 are used to compensate the dead time tolerances.

• F2 for the low range (ZP1201) and F4, F5 for the high range (ZP1301).

8.1.2 Calibration Ranges

F1 m

ust be set at 50 mR/h ± 20 mR/h

F2 must be set at 350 mR/h ± 50 mR/h

F3 must be set at 10 R/h ± 2 R/h

F4 must be set at 200 R/h ± 60 R/h

F5 must be set at 600 R/h ± 100 R/h

Measured (displayed) readings are calculated by one of the following two formulas, depending on the

intensity of the radiation field:

• Low range: N(mR/h) = [n*F1 + dead time correction {n*F2}]/17

• High range, up to 300 R/h: N(R/h) = [n*F3 + dead time correction {n*F4}]/300

• High range, over 400 R/h: N(R/h) = [n*F3 + dead time correction {n*F5}]/300

Where

n is the detector frequency obtained in the radiation field.

N is the updated measurement reading.

Between 300 R/h to 400 R/h, a weighed average of F2 and F3 is used as the dead time correction factor. The

calculation of the "averaged factor" and the corresponding measurement formula follow:

x = (last N(R/h) - 300)/100

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MGP WRM2 Especificações Página 35