MIL-PRF-23359H
4.5 Performance tests. Prior to starting the performance tests, the
contractor shall describe in detail that information which constitutes a
positive detection as heard in the headset (i.e., in amplitude, frequency, or
other signal) while also specifying the point(s) on the search head where a
maximum signal is received. Information shall also be provided on the
frequency, amplitude, or other signal when the detector is in the saturated
condition. The contractor shall provide information on the recommended head
height for best detection results.
4.5.1 Sensitivity test. The test shall be conducted with a fresh set of
batteries or suitable power supply. The headset output (i.e., amplitude,
frequency, etc.) shall be measured and recorded by electronic instruments and
compared to the information provided by the contractor prior to the start of
the test.
a.
Each detector shall be placed in a test jig fixture, at least 1 meter
from metallic objects (excluding those which are part of the detector
itself) and other extraneous magnetic/electrostatic fields.
b.
The detector shall be powered up using the on-board batteries or
suitable power supply and adjusted to the standard operational null
condition.
c.
The detector shall detect the targets described in table I, one at a
time, in a plane parallel to the underside of the search head and
passing by the point(s) on the search head where a maximum signal is
received at distances shown in table I. Point(s) on the search head
where a maximum signal is received shall be provided by the contractor.
Less than 100 percent detection constitutes failure of this test.
4.5.2 Detection capability. Balance the detector with the search head not
less than 1 meter from metallic objects. The detector shall be operational
when subjected to the sand, loam, and magnetite test lanes in a controlled
environment. Optimal head height shall be provided by the contractor. The
detector shall detect the targets in table II when buried up to, and
including, the maximum depths shown. Three of each type of target in table II
shall be buried in each soil type for a total of 12 targets per soil type.
This shall be referred to as a "lane". The detector shall detect the targets
of table II when the search head receiver coil(s) is at a head height
recommended by the contractor. The test shall be considered failed if, in any
lane, any target type is not detected a total of seven or more times.
4.5.3 No offset. The detector shall detect the metallic objects listed on
table II according to the specified depths, soils, and sweep speed. The
detector shall detect the targets of table II when the search head receiver
coil(s) is at a head height recommended by the contractor. A lane consists of
three of each type of target in table II buried in each soil type for a total
of 12 targets per soil type. A total of 37 passes shall be made over each
lane. The properties of the sand, loam, and magnetite soils containing
moisture from 2 to 25 percent and measured at frequencies of 300 through 600
MHz are as follows:
Sand
Relative dielectric constant of 2.57
Loam
Relative dielectric constant of 3.79
Magnetic susceptibility of 15k x 10-6 cgs.
Magnetite
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