Identification Of Controls And Functions - LUDLUM MODEL 3 Technical Manual

Model 3
4
Section
Ludlum Measurements, Inc.
Technical Manual
Identification of Controls and
Functions
See the Model 3 FRONT PANEL drawing at the
beginning of this manual to reference the
following controls:
: 6.4 cm (2.5 in.) arc, 1 mA analog type with pivot-and-jewel
Meter
suspension. Typical meter dials are 0-2 mR/hr, 0-20 µSv/h, 0-5 kcpm or
combination of exposure rates (0-2 mR/hr or 0-20 µSv/h) and cpm and
.
TEST
: Used to connect the detector to the instrument. Series ˝C˝ is
Connector
typically used, but "BNC," "MHV," "UHF," or others, can be used as well.
Range Selector Switch
×10, ×1, ×0.1. Turning the range selector switch from
the operator with a battery check of the instrument. A
the meter provides a visual means of checking the battery-charge status.
Moving the range selector switch to one of the range multiplier positions
(×100, ×10, ×1, ×0.1) provides the operator with an overall range of 0 to
500,000 cpm. Multiply the scale reading by the multiplier to determine the
actual scale reading.
Calibration Controls
individual range selections and allow for high-voltage adjustment from 400
to 1500 volts. A protective cover is provided to prevent tampering.
Battery Compartment
: When depressed, this switch provides a rapid means to drive
RESET Button
the meter to 0.
AUD ON-OFF Switch
located on the left side of the instrument. The frequency of the clicks is
relative to the rate of the incoming pulses. The higher the rate,
: A six-position switch marked
: Recessed potentiometers that are used to calibrate the
: Sealed compartment to house two ˝
: In the position, operates the unimorph speaker,
ON
Page 4-1
Section 4
BAT
, , ×100,
OFF BAT
to provides
OFF BAT
check scale on
BAT
˝ cell batteries.
D
April 2016