LUDLUM MODEL 3, Техническое руководство

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Model 3 Technical Manual
Section 3
Ludlum Measurements, Inc. Page 3-1 April 2016
Specifications
0
High Voltage
: adjustable from 400 to 1500 Vdc
Threshold
: fixed at -35 mV
±
10 mV
Response
: toggle switch for fast (4 seconds) or slow (22 seconds) from 10%
to 90% of final reading
Range
: typically 0-200 mR/hr, or 0-500,000 cpm
Linearity
: reading within 10% of true value with detector connected
Meter
: 6.4 cm (2.5 in.) arc, 1 mA analog type
Meter Dial
: 0-2 mR/hr, or 0-5 kcpm,
BAT TEST
(others available)
Multipliers
: ×0.1, ×1, ×10, ×100
Calibration Controls
: individual potentiometers for each range; accessible
from front of instrument (protective cover provided)
End-of-Battery Life Warning
: At 2.1 Vdc, the meter needle will drop to the
edge of the
BAT TEST
or
BAT OK
area when the meter selector switch is
moved to the
BAT
position. At 2.0 Vdc, a steady audible tone will be emitted
to warn the user of the low battery condition.
Battery Dependence
: less than 3% change in readings to battery failure
indication
Reset
: pushbutton to zero the meter
Audio
: built-in unimorph speaker with
ON
-
OFF
switch (greater than 60 dB at
2 feet)
Connector
: series
˝
C
˝
(other available)
Cable
: one-meter (39-inch) with
˝
C
˝
connector (others available)
Power
: two
˝ D ˝
cell batteries housed in a sealed externally accessible
compartment
Battery Life
: typically greater than 2000 hours with alkaline batteries and
with the
AUD ON
-
OFF
switch in the
OFF
position
Section
3