Posted: 11/21/2012 2:51:10 PM EDT
[#1]
Ok, this is a complicated question, but essentially, COMSPEC is anything that isn't MILSPEC.
So the question might be better phrased, "What is Milspec?"
Milspec can be used to define any monocular or otherwise any part that has been created for military use and that conforms the the various performance standards that were defined for that part.
However, it's not as simple as just the performance characteristics, since the Compsec models use the same parts as the Milspec ones right? And their performance is the same, as is their function.
So you might next ask; if Commspec monoculars sometimes use all Milspec parts, then why aren't those monoculars considered Milspec?
I did some research into exactly that question a few weeks back to work out the difference... Here's what I found. All of the specifications and tests it needs to have done during the manufacturing process, including the necessary standards of paperwork reflecting those standards... ( cut and pasted from another post I made... with slight changes. )
What makes a MILSPEC PVS-14... Just to make clear, ANY DEVICE THAT MEETS THE BELOW REQUIREMENTS SHOULD BE A MILSPEC AN/PVS-14, as defined by Omni VIII. MILPRFA3256342(CR) - Lens Assembly, Objective for Monocular Night Vision Device, AN/PVS-14 MIL-PRF-A3256363(CR) - Image Intensifier Assembly, 18MM, Microchannel Wafer MX-11769/UV MIL-PRF-49257 - Coated Optical Components (COC) MIL-PRF-49324(CR) - Monocular Night Vision Device, AN/PVS-14 MIL-PRF-49427(CR) - Lens Assembly, Eyepiece for Aviator’s Night Vision Imaging System, AN/AVS-6(V)( )and Monocular Night Vision Device, AN/PVS-14 A3207330 - Wired Housing Assembly AN/PVS-14 MNVD A3256337 - Wired Housing Assembly AN/PVS-14 MNVD TM 11-5855-306-10 - Operator’s Manual, Monocular Night Vision Device (MNVD), AN/PVS-14 TM 11-5855-306-23&P - Unit and Direct Support Maintenance Manual Including Repair Parts and Special Tools List, Monocular Night Vision Device (MNVD), AN/PVS-14 ANSI/ASQC Q9001:2008Quality Management Systems – Requirements ANSI/ASQ Z1.4-2008Sampling Procedures and Tables for Inspection by Attributes ANSI/NCSL Z540.3-2006Requirements for the Calibration of Measuring and Test Equipment AMSE Y14.5M-2009Dimensioning and Tolerancing ANSI/ASQ Q10012-2003Measurement Management Systems – Requirements for Measurement Processes and Measuring Equipment ASTM D 3951Standard Practice for Commercial Packaging Omni VIII AN/PVS-14 Test Requirements ( MILSPEC AN/PVS-14 by definition )
Test
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Requirement
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Freq.
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Sample
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Inspections
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|
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Parts and materials
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3.3.1, 3.3.2
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M
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100%
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Finishes
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3.3.6
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M
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100%
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Workmanship *
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3.3.7
|
M
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100%
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Marking *
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3.3.8
|
M
|
100%
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Head mount / helmet mount
|
3.4.1.2
|
M
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100%
|
|
|
|
|
Group A
|
|
|
|
Electrical/Switch *
|
3.4.1.1
|
M
|
100%
|
Resolution – Far focus *
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3.4.2.4.4.1
|
M
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100%
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Resolution – Close focus *
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3.4.2.4.4.2
|
M
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100%
|
Focus adjustment *
|
3.4.2.4.6
|
M
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100%
|
Light emitting diode *
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3.4.2.4.12
|
M
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100%
|
LED indicator *
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3.4.2.4.13
|
M
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100%
|
Low voltage indicator *
|
3.4.2.4.14
|
M
|
100%
|
High light cut-off *
|
3.4.2.4.16
|
M
|
100%
|
|
|
|
|
Group B
|
|
|
|
Brightness gain *
|
3.4.2.4.11
|
M
|
Level I, 1.5%
|
Off-axis veiling glare *
|
3.4.2.4.5
|
Q
|
Level S-4, 1.5%
|
|
|
|
|
Group C
|
|
|
|
|
|
|
|
Subgroup 1 (Tested in order listed)
|
|
|
|
Vibration
|
3.4.3.9
|
M
|
Level S-4, 1.5%
|
Temperature extremes
|
3.4.3.1
|
M
|
Level S-4, 1.5%
|
Immersion
|
3.4.3.4
|
M
|
Level S-4, 1.5%
|
Humidity
|
3.4.3.3
|
M
|
Level S-4, 1.5%
|
|
|
|
|
Subgroup 2
|
|
|
|
Temperature altitude
|
3.4.3.2
|
Q
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Level S-4, 1.5%
|
Weapon shock
|
3.4.3.12
|
Q
|
Level S-4, 1.5%
|
|
|
|
|
Group D
|
|
|
|
Reliability
|
3.4.5
|
Q
|
Five systems
|
EMI
|
3.4.
|
A
|
Three systems
|
Audibility
|
3.4.2.4.9
|
A
|
Three systems
|
Now, any PVS-14 that meets ALL of the above specifications, is built according to the standards and has documentation and records of that process maintained according to the standard and is tested and passes the above tests as required, can be considered a Milspec part.
Mill just one, and you have a commspec part. Even if the part otherwise meets the Milspec.
So, the difference can be slim, or it can be huge. A commspec part can even exceed Milspec performance, but, as an example, if they don't record that the LED test indicator was working, or it's recorded on a non-conforming sheet, or the serial number wasn't recorded, then it's just Commspec even if it meets every other requirement.
And that is the difference between Comspec and Milspec. Regards
David
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