MGP WRM2 Spezifikationen PDF herunterladen (Seite 29)

TelePole WR/ Operating & Maintenance Manual Page 29

High Voltage Power Supply

The H.V. board includes an ORAM 5525 transformer, a voltage multiplier (D1, D2, D3,

C8, C11), an RV4192 switching regulator.

R3 and R4 are voltage feedback for the switching regulator.

H.V. range: 500V to 550V DC. The high voltage is aimed for both geigers.

Pulse Shaper

Each geiger includes a pulse shaper circuit.

Q3 and RC for the low range geiger 1201.

Q5 and RC for the high range geiger 1301.

7.3.1. Select Geigers

The detector includes two geigers: Low range - ZP-1201 (or equivalent), and high range -

ZP-1301 (or equivalent).

In a field of 0.01 mR/h to 800 mR/h both geigers are connected and the field is measured by

the low range geiger. In case the radiation field is higher than 800 mR/h, the low range

geiger is disconnected, and the radiation field is measured by the high range geiger.

The switching between the low and high range geigers is done at 800 mR/h when the

radiation field increases (low range geiger is disconnected), and at 600 mR/h when the

radiation field decreases (low range geiger is connected).

Geigers selection is performed via J1/2 control line.

Pulse Drive

Q2, Q4 and R23 drive the detector pulses to the meter.

High Range

Geiger Type

Low Range

Overflow

alarm

Field

800 mR/h

1000 R/h

ZP 1301

ZP 1201

600 mR/h

0.01 mR/h

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MGP WRM2 Spezifikationen Seite 29