Ludlum Measurements 12, Technical Manual

Page: 13 / 46

Model 12 Technical Manual
Section 3
Ludlum Measurements, Inc. Page 3-1 July 2017
Specifications
0
Multipliers
: ×1, ×10, ×100, and ×1000 selected by a front-panel range
selector switch
High Voltage
: adjustable from 400 to 2500 volts; can be read on the
meter; electronically regulated to 1%; support of scintillation loads to
1500 volts, proportional loads to 2500 volts
Input Sensitivity
: adjustable from -1 to -100 mV
Input Impedance
: 0.1 megohm
Meter
: 6.4 cm (2.5 in.) arc, 1 mA analog type
Meter Dial
: 0-500 cpm, 0-2.5 kV,
BAT TEST
(others available)
Range
: typically 0-500,000 counts/minute (
CPM
)
Linearity
: reading within 10% of true value with detector connected
Calibration Controls
: individual potentiometers for each range;
accessible from the front cover while in operational status
Response
: toggle switch for
FAST
(4 seconds) or
SLOW
(22 seconds)
from 10% to 90% of final reading
Connector
: Series ˝ C ˝ (other available)
Cable
: 39-inch with
˝
C
˝
connector
Reset
: pushbutton to zero the meter
Audio
: built-in unimorph speaker with
ON
-
OFF
switch (greater than
60 dB at 0.61 m {2 ft})
Section
3