Model 12-4 Technical Manual Section 1
Ludlum Measurements, Inc. Page 1-1 May 2016
Introduction
he Model 12-4 is a Survey Meter coupled to a Model 42-31H
Neutron Detector; providing the required electronic circuitry and
detector for measuring and monitoring of neutron radiation. The
instrument provides four linear ranges used in combination with an
exposure rate or
CPM
(counts per minute) meter dial. The instrument
features a regulated HV (high-voltage) power supply, unimorph speaker
with audio
ON
-
OFF
capability, fast-slow meter response, meter reset button
and a six-position switch for selecting battery check or range multiples of
×1, ×10, ×100, and ×1000. Each range multiplier has its own calibration
potentiometer. The unit body and meter housing are made of cast aluminum
and the can is 0.23 cm (0.090 in.) thick aluminum.
The unit is powered by two ˝
D
˝ cell batteries for operation from -20 to 50 ˚C
(-4 to 122 ˚F). For instrument operation below 0˚C (32 ˚F), use very fresh
alkaline or rechargeable NiCd batteries.
Sectio
1
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