Model 12-4 Technical Manual Section 3
Ludlum Measurements, Inc. Page 3-2 May 2016
Linearity: reading within 10% of true value with detector connected
Discriminator: adjustable from 1 to 50 mV
Audio: built-in unimorph speaker with ON-OFF switch (greater than
60 dB at 61 cm {2 ft})
Response: toggle switch for FAST (4 seconds) or SLOW (22 seconds)
from 10% to 90% of final reading
Connector
: Series ˝C˝ (other available)
Cable: 99.1 cm (39 in.) with ˝C˝ connector (others available)
Power: two ˝D˝ cell batteries housed in a sealed externally accessible
compartment
Battery Life: typically 600 hours with alkaline batteries (battery
condition may be checked on the meter)
End-of-Battery Life Warning: At 2.1 Vdc (voltage direct current) 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: instrument calibration change less than 3%
within battery check limits on the meter
Size: 43.2 x 22.9 x 26.7 cm (17 x 9 x 10.5 in.) (H x W x L)
Weight: 7.9 kg (17.5 lb)
Construction: cast and drawn aluminum with beige powder-coat finish
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