MGP WRM2 Spezifikationen PDF herunterladen (Seite 28)

TelePole WR/ Operating & Maintenance Manual Page 28

Internal / External Geiger Selection

U2 - 74HC132 and port J2/4 are used to select between the internal and external geiger.

J2/4 enables to select between operation and display of internal geiger or external geiger.

J2/4 = “0” - internal geiger

J2/4 = “1” - external detector.

3V to 5V Converter & Low Battery Identification

MRX756 (U1) and RCL components convert the battery voltage to 5V, (which is) the

meter’s main power supply.

Input voltage range: 1.7V to 3V DC.

Output voltage range: 5V ±0.1V.

Low battery identification is performed by U1. When the battery voltage reduces below

2.0V on pin LB1, LB0 (pin 4) on U1 resets to “0”.

3V to 12V Converter

MAX771 (U4) and RCL components convert the battery voltage to 12V that is aimed for

the speaker circuit.

7.2. WRM Communication

Q2, Q3 and resistors adapt between the WRM transmitter and meter voltage levels.

E1 (1-3) should be shorted.

7.3. Wide Range Detector

DRW # 12852-40-00

Detector Block Diagram

Pulse

Shaper

H.V.

GM 1201

Low

Range

H.V.

Power supply

500V

±±

20V

Select

Geiger

Driver

Pulse

Driver

Pulse

Shaper

H.V.

GM 1301

High

Range

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 57 58

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