General; Specifications; Description Of Controls And Functions - LUDLUM Model 6 Manual

1.

GENERAL

The Model 6 is a portable battery operated
Geiger Counter with an internal GM detector.
The instrument features a regulated high-voltage
supply, five-position switch for selecting battery
check or scale multipliers of X1, X10, X100, and
internal calibration controls for the range
2.

SPECIFICATIONS

two standard "D" size batteries
POWER:
0-1 R/hr; meter presentation
LINEAR RANGES:
of 0-10 mR/hr with range multiples of X1, X10,
and X100
DETECTED RADIATION:
±10% full scale
LINEARITY:
exceeds 600 hours with a fresh
BATTERY LIFE:
set of alkaline "D" cell batteries
BATTERY DEPENDANCE:
changes less than 3% within battery check limits
on meter
OVERLOAD PROTECTION:
deflects meter pointer to full scale when the
detector is exposed to radiation intensities greater
than the upper operating limit (greater than 10
R/hr)
3.

DESCRIPTION OF CONTROLS AND FUNCTIONS

Range Multiplier Selector Switch: A five-
position switch marked OFF, BAT, X100, X10,
and X1. Turning the range selector switch from
OFF to BAT position provides the operator a
battery check of the instrument. A BAT check
scale on the meter provides a visual means of
checking the battery status. Moving the range
selector switch to one of the range multiplier
positions (X1, X10, X100) provides the operator
Model 6 Geiger Counter
February 2011
gamma; X-ray
instrument calibration
overload circuitry
page 1
multipliers, and high voltage. The meter scale
reads 0 to 10 mR/hr, producing a range of 0 to 1
R/hr with the three linear range multipliers. The
unit body is made of cast aluminum, including
the meter housing. The instrument cover (can) is
0.23 cm (0.090 in.) thick aluminum.
1 milli-amp, 6.4 cm (2.5 in.) scale with
METER:
pivot-and-jewel movement
four seconds measured from
RESPONSE TIME:
10% to 90% of full scale
internally-mounted 71412 tube
DETECTOR:
10.7 x 8.9 x 21.6 cm (4.2 x 3.5 x 8.5 in.) (H
SIZE:
x W x L), less handle
1.4 kg (3 lb) less detector, batteries, and
WEIGHT:
handle
drawn-and-cast aluminum, with beige
FINISH:
powder coat
with an overall range of 0-1R/hr. Multiplying the
scale reading by the multiplier determines the
actual reading.
Range Calibration Adjustments: Internal
potentiometers which allow individual calibration
for each range multiplier.
instrument housing will allow access to these
controls.
Removing the