Attachment 1.pdf

Comments, suggestions, or questions on this document should be addressed to Commander, Naval Sea Systems Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to CommandStandards@navy.mil, with the subject line “Document Comment”. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https://assist.dla.mil.

AMSC N/A FSC 6625

DISTRIBUTION STATEMENT A. Approved for public release. Distribution is unlimited.

NOT MEASUREMENT

SENSITIVE

MIL-PRF-28800G

17 November 2021

SUPERSEDING

MIL-PRF-28800F

24 June 1996

PERFORMANCE SPECIFICATION

TEST EQUIPMENT FOR USE WITH ELECTRICAL AND ELECTRONIC EQUIPMENT

This specification is approved for use by all Departments and Agencies of the Department of Defense.

1. SCOPE

1.1 Scope. This specification covers the general requirements for, but is not limited to, test equipment (see 6.6.28) used in testing and calibrating electrical and electronic equipment. The test equipment may be of commercial design and includes general purpose, special purpose, peculiar, console mounted, automatic test equipment (ATE) (see 6.6.3), and calibration standards. This specification should also be used for built-in test equipment (BITE) (see 6.6.6) when the requirements for a built-in test (BIT) (see 6.6.5) are not included in the system specification. Detailed requirements for particular test equipment should be as specified (see 6.2).

1.2 Classification. Test equipment covered by this specification is categorized by performance characteristics required for an intended location of use and the most severe prevailing environmental conditions of such locations.

Test equipment are of the following classes as specified (see 6.2), and the performance characteristics required for each class are summarized in table II:

a. Class 1 - Equipment is designed for hostile operational environments where the environmental conditions are extremes of world climatic variation. Examples include test equipment for use in the vicinity of aircraft, in tracked and wheeled vehicles, or for typical above-deck applications.

b. Class 2 - Equipment is designed for rugged (see 6.6.22) operational environments where the environmental conditions are routinely encountered in an unprotected, uncontrolled climate. Test equipment for use as a portable (see 6.6.20) instrument in more than one location that has a substantial degree of environmental protection may be considered as class 2.

c. Class 3 - Equipment is designed for operational environments where conditions are routinely encountered in a diverse, controlled climate. Examples include test equipment for bench-top (see 6.6.4), rack-mount, or occasional portable use in diverse and environmentally controlled locations.

d. Class 4 - Equipment is designed for benign operational environments where the environmental conditions are controlled and protected. Examples include test equipment for use in a fully protected and environmentally controlled service area such as a laboratory.

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed.

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MIL-PRF-28800G

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests

(Copies of this document are available online at https://quicksearch.dla.mil.)

2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

NAVAL SEA SYSTEMS COMMAND (NAVSEA) PUBLICATIONS

S9310-AQ-SAF-010 - Technical Manual for Batteries, Navy Lithium Safety Program Responsibilities and Procedures

(Copies of this document are available online via Technical Data Management Information System (TDMIS) at https://mercury.tdmis.navy.mil by searching for the document number. Refer questions, inquiries, or problems to:

DSN 296-0669, Commercial (805) 228-0669. This document is available for ordering (hard copy) via the Naval Logistics Library at https://nll.navsup.navy.mil. For questions regarding the NLL, contact the NLL Customer Service at nllhelpdesk@navy.mil, (866) 817-3130, or (215) 697-2626/DSN 442-2626.)

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

ELECTRONIC COMPONENTS INDUSTRY ASSOCIATION (ECIA)

EIA/ECA-310 - Cabinets, Racks, Panels, and Associated Equipment

(Copies of this document are available online at https://global.ihs.com.)

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, INC. (IEEE)

IEEE 315 - Graphic Symbols for Electrical and Electronic Diagrams (Including Reference Designation Letters

IEEE 488.1 - Higher Performance Protocol for the Standard Digital Interface for Programmable Instrumentation – Part 1: General

IEEE 488.2 - Standard Digital Interface for Programmable Instrumentation – Part 2: Codes, Formats, Protocols and Common Commands

IEEE 802.3 - IEEE Standard for Ethernet

(Copies of these documents are available online at www.ieee.org.)

INTERNATIONAL ELECTROTECHNICAL COMMISSION (IEC)

IEC 61000-4-2 - Electromagnetic Compatibility (EMC) – Part 4-2: Testing and Measurement Techniques – Electrostatic Discharge Immunity Test

IEC 61000-4-3 - Electromagnetic Compatibility (EMC) – Part 4-3: Testing and Measuring Techniques – Radiated, Radio-Frequency, Electromagnetic Field Immunity Test

IEC 61000-4-4 - Electromagnetic Compatibility (EMC) – Part 4-4: Testing and Measurement Techniques – Electrical Fast Transient/Burst Immunity Test

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IEC 61000-4-6 - Electromagnetic Compatibility (EMC) – Part 4-6: Testing and Measurement Techniques – Immunity to Conducted Disturbances, Induced by Radio-Frequency Fields

IEC 61010-1 - Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use – Part 1: General Requirements

IEC 61010-031 - Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use – Part 031: Safety Requirements for Hand-Held and Hand-Manipulated Probe Assemblies for Electrical Test and Measurement

IEC CISPR 11 - Industrial, Scientific and Medical Equipment – Radio-Frequency Disturbance Characteristics – Limits and Methods of Measurement

(Copies of these documents are available online at www.iec.ch.)

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 7779 - Acoustics – Measurement of Airborne Noise Emitted by Information Technology and Telecommunications Equipment

(Copies of this document are available online at www.iso.org.)

UNDERWRITERS LABORATORIES, INC. (UL)

UL 60950-1 - Information Technology Equipment – Safety – Part 1: General Requirements

(Copies of this document are available online at www.comm-2000.com.)

2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 Equipment sample requirements.

3.1.1 Bid sample. When specified (see 6.2), a bid sample shall be subjected to bid sample inspection (see 6.3) in accordance with 4.2.

3.1.2 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.4) in accordance with 4.3.

3.2 Equipment components. Parts, materials, and processes shall be as specified herein and shall permit the test equipment to meet all applicable requirements of its class.

3.2.1 Finish. Unless otherwise specified (see 6.2), the equipment shall be the finish normally provided by the manufacturer.

3.2.2 Color. Unless otherwise specified (see 6.2), the color shall be the color normally provided by the manufacturer.

3.2.3 Interchangeability. A model number shall be designated for the units (see 6.6.28) provided. All units and the replaceable assemblies, subassemblies, and parts comprising the unit shall be interchangeable on a noninterference basis with all such designated models provided.

3.2.4 Restricted materials. Test equipment furnished to the Navy that uses material restricted for Navy use (see 3.2.4.1) or that exceeds the size limitations (see 3.7.1) of this specification requires NAVSEA approval prior to procurement.

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3.2.4.1 Material restricted for Navy use. Unless otherwise specified (see 6.2), the following materials and parts shall not be used in equipment for the Navy:

a. Mercury, including mercury batteries

b. Radioactive material

c. Lithium electrochemical cells

d. Helium-3

e. Cadmium, except batteries

3.2.4.2 Other restricted materials and gases. Test equipment shall not contain materials that promote the premature failure of the equipment or that present a health hazard under normal use or storage conditions as specified herein.

3.2.4.2.1 Organic materials. Test equipment shall not contain materials prone to organic decay or that act as a nutrient for the growth of multicelled organisms.

3.2.4.2.2 Flammable materials. Test equipment shall not contain materials that ignite into flames at operating or storage temperatures.

3.2.4.2.3 Explosive materials. Test equipment shall not contain materials that explode at operating or storage temperatures.

3.2.4.2.4 Carcinogens. Certain chemicals have been identified by the Occupational Safety and Health Administration (OSHA) in CFR Title 29 Part 1910 as cancer-producing substances (carcinogens). Electrical test equipment shall not contain carcinogenic materials.

3.2.4.2.5 Helium. Helium shall not be used as pressurizing gas in sealed units containing electron tubes. When necessary to use helium for leak detection purposes, exposure shall be limited to the time necessary for the test followed by thorough purging. Helium-3 shall not be used due to limited availability.

3.2.4.3 Combination of materials. The equipment shall not contain any combination of materials that cause deterioration of any material contained in the equipment due to the effects of outgassing.

3.2.5 Recycled, recovered, environmentally preferable, or biobased materials. Recycled, recovered, environmentally preferable, or biobased materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs.

3.3 Design and construction.

3.3.1 Operator adjustments. The equipment shall include built-in adjustments or compensating devices for any function or parameter that would exceed the specified tolerance within the calibration interval defined in 3.13.

Under all specified service conditions, the variation of any adjustment or control shall produce the desired control action to bring the equipment within tolerance.

3.3.2 Operator controls. Operating controls and indicators shall be readily accessible to the operator from the front of the equipment. The readings presented on the controls and indicators shall be available to the operator without conversion or calculation.

3.3.3 Electric connectors. Provision shall be made to ensure that connectors can only be mated with the appropriate counterparts. Where design considerations require close proximity of connectors of similar configuration, the mating connectors shall be suitably coded or marked. The live or hot side of unmated connectors shall be protected against shorting.

3.3.4 Internal wiring. Internal wiring practices shall be such that the wiring shall not be damaged during normal maintenance, filter service, and calibration.

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3.3.5 Internal cooling. The equipment shall be capable of operating without interruption for at least 24 hours (or maximum battery life) at the maximum operating temperature for the applicable class. Cooling devices used in the equipment shall be an integral part of the equipment and shall not degrade any aspect of performance or safety.

3.3.6 Front panel display indicators. Front panel display indicators designed to present change-of-state information to the operator shall be distinguishable at a distance of 1 meter (m) in a maximum ambient light level of 100 foot-candles (fc) and a minimum light level of 1 fc. All display indicators shall be discernible at viewing angles from 0 to 45 degrees.

3.3.7 Self-test capability. The equipment shall be able to provide automatic diagnostic self-test (see 6.6.25) information. At a minimum, the information provided shall indicate whether the equipment is functional or identify malfunctions. Passive devices (see 6.6.18) are not required to have a self-test function.

3.4 Cybersecurity. Cybersecurity requirements shall be as specified (see 6.2).

3.5 Digital control interface. When specified (see 6.2), a digital control interface shall be provided. The measurement information to be transferred by the digital control interface shall be as specified (see 6.2). The digital control interface shall have the programmable capability to control each device function including all ranges, modes, and levels. Primary power control and other non-measurement functions need not be controllable through the digital control interface.

3.5.1 IEEE 488 interface requirements. If an IEEE 488 digital control interface is specified (see 6.2), it shall comply with IEEE 488.1 and with the specified portions of IEEE 488.2. The interface functions and subset identifications specified below shall be considered for determining equipment requirements.

Interface function Subset identification

Source handshake SH1 Acceptor handshake AH1 Talker T1 or TE1 Listener L1 or LE1 Service request SR1 Remote local RL1 Parallel poll PP0 Device clear DC1 Device trigger DT1 Controller C0 Configuration CF

3.5.2 IEEE 802.3 ethernet interface requirements. If an IEEE 802.3 digital control interface is specified

(see 6.2), it shall comply with the 10/100/1000 Base-T communications sections of IEEE 802.3.

3.5.3 USB interface requirements. If a USB digital control interface is specified (see 6.2), it shall conform to the standards specified by the Universal Serial Bus Implementers Forum (USB-IF).

3.6 Electrical power sources and connections.

3.6.1 Electrical power source. The equipment shall operate from the input power (see 6.6.12) conditions specified herein. When multiple power source requirements are invoked, the equipment shall operate with each required source without changing manually operated devices for compensation, such as tapped transformers (variable setting transformers) and other similar devices. When multiple power source requirements are invoked, all power source settings shall be automatically selected or externally selectable.

3.6.1.1 Power consumption. The maximum power for operation shall be as specified (see 6.2).

3.6.1.2 Nominal and alternate power source. Equipment that does not have a battery as the primary power source shall operate at 120 volts root mean square (Vrms), single-phase, 50 hertz (Hz) and 60 Hz source (see table I). Alternate power source requirements, which may be required for equipment, are specified as follows:

a. 50 Hz, 60 Hz, and 400 Hz single-phase 120 Vrms.

b. 50 Hz, 60 Hz, and 400 Hz single-phase with voltage selectable from a 100/120/220/240 Vrms range.

c. 50 Hz, 60 Hz, and 400 Hz single-phase 120/240 Vrms (see 3.6.1.2.4).

d. Direct current (DC) internal power source (see 3.6.1.2.5).

e. DC external power source (see 3.6.1.2.6).

Equipment designed to operate from both external and internal power sources shall conform to specified performance and accuracy requirements when operated from the external source with the internal battery removed.

There shall be an indication of the selected power source.

TABLE I. Power source.

Voltage (Vrms)

Steady-state Transient-state Interruption

Nominal 108 to 132 84 to 108 132 to 156 0 to 84

Alternate (see 3.6.1.2.4) 216 to 264 168 to 216

264 to 312 0 to 168

Frequency (Hz)

Steady-state Transient-state Interruption

Nominal

47.5 to 52.5 45 to 47.5

52.5 to 57 0 to 45

57 to 63 54 to 57 63 to 66 0 to 54

Alternate (see 3.6.1.2.4) 380 to 420 360 to 380

420 to 440 0 to 360

3.6.1.2.1 Steady-state conditions. The performance and accuracy of the equipment shall not be adversely affected when operating under any combination of the following conditions:

a. The steady-state voltage variation (see 6.6.12.d) shall be ±10 percent of the nominal power source voltage as specified in table I.

b. The steady-state frequency variation (see 6.6.12.d) shall be ±5 percent of the nominal power source frequency as specified in table I.

c. The deviations in waveform characteristics shall be as follows:

(1) Waveform deviation factor of ±10 percent or less (see 6.6.12.a)

(2) Total harmonics of ±10 percent or less (see 6.6.12.b(1))

(3) Individual harmonics of ±5 percent or less (see 6.6.12.b(2))

(4) Crest factor of 1.27 to 1.56 (see 6.6.12.c)

3.6.1.2.2 Transient-state conditions. For transients that do not exceed the nominal steady-state band specified in table I, the transient recovery time (see 6.6.12.f) of the equipment shall not exceed 500 milliseconds (ms).

Operation of the equipment during voltage and frequency transients that exceed the allowable nominal steady-state bands specified in table I shall be in accordance with the following:

a. The maximum transient amplitude (see 6.6.12.e) of voltage transients within the range of ±10 percent to ±30 percent shall not cause the operation of the equipment to be impaired for longer than 30 seconds following the transient and shall not cause loss of information stored in volatile memory. Testing shall be in accordance with 4.5.5.6.3.

b. The maximum transient amplitude (see 6.6.12.e) of frequency transients within the range of ±5 percent to ±10 percent shall not cause the operation of the equipment to be impaired for longer than 30 seconds following the transient and shall not cause loss of information stored in volatile memory. Testing shall be in accordance with 4.5.5.6.4.

The equipment performance may be impaired during the transient. Transient values are derived from and referenced to the nominal values specified for voltage and frequency.

3.6.1.2.3 Interruption of power source. Voltage or frequency interruptions shall not cause damage to the equipment. A power source interruption is when the voltage falls in the range of 0 to 70 percent of nominal or frequency falls in the range of 0 to 90 percent of nominal. Equipment performance is not required during interruption of the power source. After power interruptions of any duration, the equipment shall automatically resume operation at either the last operating condition before interruption or a default power-up condition.

3.6.1.2.4 Alternating single-phase source. When the equipment is designed to operate from a 240-Vrms nominal or 400-Hz nominal alternating single-phase source, the tolerance and times of the steady-state, transient-state, and interruption of power source requirements shall apply to the alternate power source.

3.6.1.2.5 DC internal power source. When specified (see 6.2), the equipment shall be designed to operate from self-contained batteries.

3.6.1.2.5.1 Battery restrictions. Battery restrictions shall apply as follows:

a. Standard batteries. Unless otherwise specified (see 6.2), maximum use shall be made of standard, nomenclatured battery-power sources.

b. Mercury batteries. Unless otherwise specified (see 6.2), the use of mercury batteries is restricted and these shall not be used in equipment. If a restricted type of battery is specified, the Use and Installation Manual (see 6.6.32) and the Maintenance and Service Manual (see 6.6.15) shall reference substitute battery types and all necessary modifications to use the substitute batteries. The equipment shall incorporate safety precautions of UL 60950-1 and a label containing the following caution and battery information shall be affixed to the outside of the unit:

c. Lithium batteries. S9310-AQ-SAF-010 establishes the safety guidelines for the usage of lithium batteries.

Unless otherwise specified (see 6.2), the use of lithium batteries is prohibited without prior authorization.

S9310-AQ-SAF-010 promulgates the exception requirements for approving the usage of lithium batteries If equipment qualifies for one or both of the documented exceptions, then the required information shall be as specified (see 6.2) at the time of submission of proposals. If equipment does not qualify for an exception, then a request for approval for the use of lithium batteries shall be as specified (see 6.2). Approval shall apply only to the specific model proposed.

THIS UNIT CONTAINS MERCURY BATTERIES

Battery Manufacturer:

Battery Part Number:

The lithium ion rechargeable cell manufacturer, part number, configuration (number of cells in series), nominal voltage, and rated capacity shall be as specified (see 6.2) at the time of submission of proposals. The equipment shall incorporate safety precautions of UL 60950-1 and a label containing the following caution and battery information shall be affixed to the outside of the unit:

3.6.1.2.5.2 Battery information. If batteries are used in the equipment, instructions shall be provided that describe the procedure for battery replacement, including the part number of the battery and description of the replacement process. If lithium batteries are used, proper disposal procedures shall be contained in the Use and Installation Manual and the Maintenance and Service Manual.

3.6.1.2.5.3 Battery state indicator. A battery state indicator shall be provided to indicate when the capacity of batteries used for primary power is low. The approximate remaining operating time for the low battery state shall be specified in the Use and Installation Manual.

3.6.1.2.5.4 External battery pack. When the equipment is required to operate from an external portable battery pack, the battery pack shall be as specified (see 6.2).

3.6.1.2.6 DC external power source. Equipment operation from an external DC source shall be as specified (see 6.2).

3.6.2 Electrical power connections. The requirements specified herein shall apply to equipment rated at 10 amperes (A) rms or less. Power connectors and connections for equipment rated above 10A rms shall be as specified (see 6.2). When single-phase operation is specified, the equipment shall operate with a ground at the primary power source whether from an ashore site that has “grounded circuitry” or afloat where the ship has “ungrounded circuitry.

3.6.2.1 Multiphase equipment. Except as specified for leakage current (see 3.11), equipment requiring multiphase power shall be as specified (see 6.2).

3.6.2.2 Input power cable. Unless otherwise specified (see 6.2), the appropriate input power cable shall be a detachable power cable normally provided by the manufacturer.

3.6.2.3 Input power switch. For bench top equipment, the operator shall be able to energize the equipment from the front panel; a standby (see 6.6.27) capability may be incorporated to activate and deactivate the equipment.

If such a capability is included, warnings shall be placed in the Use and Installation Manual and on the equipment to warn the operator of possible shock hazards during servicing due to partially activated power supplies.

3.6.2.4 Power selection switch. When the configuration of the equipment requires a power selection switch, the equipment shall include options to operate at 120 Vrms or 240 Vrms. A safety mechanism shall be incorporated to prevent accidental switching between voltage selections.

3.6.2.5 Excessive current drain protection. Automated safety mechanisms shall be incorporated to automatically disconnect the equipment in the event of current being drawn that is in excess of the equipment rating.

The mechanism shall be in the front for class 1 equipment or in an exterior panel for class 2, class 3, and class 4 equipment.

3.6.2.6 Indicators. The front panel shall include visual indicators that indicate when the equipment is energized.

3.6.2.7 Battery operating and recharge time. When battery operation is required, the operating and recharge time shall be as specified (see 6.2).

THIS UNIT CONTAINS LITHIUM BATTERIES

Battery Manufacturer:

Battery Part Number:

3.6.2.8 Battery charger. When specified (see 6.2), the equipment shall be provided with an internal battery charger capable of charging the internal batteries when the equipment is connected to the specified alternating current (AC) power source. Unless otherwise specified (see 6.2), the recharging time to 90 percent capacity provided by the battery charger shall be less than or equal to 75 percent of the operating time provided by a fully charged battery. The charging circuit shall not load the internal battery when the equipment is disconnected from the AC power source. If mechanical or electrical disconnection of the charging circuit is required by the design, disconnection shall be allowed by means other than manual switching. When rechargeable batteries and a charger are required, an automatic protective device shall be included to prevent overcharging the batteries.

3.6.2.9 Battery compartment. When specified (see 6.2), the equipment powered from internal batteries shall include an externally accessible, covered battery compartment. The compartment shall only provide access to the battery and features required for normal operator service, such as fuse replacement, but shall not allow for user alteration of calibration. The battery compartment shall provide protection from external sources that could damage the battery, protect the equipment from deteriorated batteries, and provide access to clean the compartment. The battery polarity, voltage, and type shall be marked in a prominent place on or adjacent to the battery compartment.

3.7 Enclosure physical characteristics. Unless otherwise specified (see 6.2), a commercial-off-the-shelf (COTS) enclosure (see 6.6.9), normally provided by the manufacturer, that meets the requirements herein shall be acceptable.

3.7.1 Dimensions. Dimensions shall be as specified (see 6.2). The required dimensions for the height, width, and depth may be specified for both maximum and partial dimensions (see 6.6.8). For Navy use in shipboard applications, the maximum dimensions shall not exceed a size capable of passage through hatches 508 millimeters

(mm) (20 inches) wide by 965 mm (38 inches) high, reduced further by round corners on a 254-mm (10-inch) radius and through circular openings 635 mm (25 inches) in diameter.

3.7.2 Weight. The maximum weight shall be as specified (see 6.2). When a mainframe (see 6.6.28.1) and plug-in (see 6.6.28.2) configuration is supplied, the combined weight shall not exceed the maximum weight allowed.

If the weight exceeds 20 kilograms (kg) (44 pounds), a label containing the following cautionary note and weight information shall be affixed to the outside of the unit:

3.7.3 Mechanical stability. Equipment shall be designed to preclude tipping during normal handling and operation. Testing shall be in accordance with 4.5.7.4. This requirement is not applicable to test equipment smaller than 2000 cubic centimeters (cc) with a weight less than 2.5 kg and excludes equipment that has a depth of 4.5 or more times the height or that has a height of less than 100 mm.

3.7.3.1 Attitude. Equipment shall be mechanically stable when positioned in its normal attitude on a bench for horizontal viewing of the front panel and when placed in its alternate attitude on the floor or deck for vertical viewing of the front panel. The size and weight limitations of 3.7 apply to this requirement.

3.7.4 Enclosure requirements. The degree of protection provided by the enclosure shall allow the equipment to pass the environmental tests applicable to the specified class.

3.7.4.1 Cover. When specified (see 6.2), the enclosure shall have a cover.

3.7.4.2 Latches. When latches are incorporated in the design of the equipment, they shall incorporate a quick-opening mechanism.

3.7.4.3 Stacking provisions. Equipment enclosures shall have a geometric configuration that permits stacking without harm to the enclosure or its contents. The maximum stacking height (expressed as a quantity of equipment in excess of one) shall be as specified (see 6.2).

TWO-PERSON LIFT

THIS UNIT EXCEEDS 20 KG (44 LBS) AND REQUIRES

TWO PERSONS TO MOVE

3.7.4.4 Component protection. Panels shall be designed to conform to the bench handling requirement of 3.9.5.3.

3.7.4.5 Handles. Unless otherwise specified (see 6.2), one or more handles shall be provided. The number and location of handles shall be such that the load distribution per handle shall not exceed 20 kg. Handles shall be located above the equipment center of gravity to ensure carrying stability. Handles shall permit compliance with the enclosure attitude provisions specified in 3.7.3.1.

3.7.4.6 Accessory stowage. When specified (see 6.2), the enclosure shall be capable of stowing all accessories (see 6.6.1). Stowage shall not adversely affect the carrying stability of the equipment and shall be contained in a manner that prevents damage to the accessories or equipment during transit. Stowed items shall be available without disturbing enclosure seams.

3.7.4.7 Corners. All corners shall be designed to preclude injury to personnel or damage to material. All corners shall be reinforced to protect the equipment from damage during the specified environmental conditions.

3.7.4.8 Connections and controls. Unless otherwise specified (see 6.2), all external electrical connections (except power connections) and operating controls shall be on the instrument panel. Electrical power connections shall be on the rear.

3.7.4.9 Chassis fasteners. Unless otherwise specified (see 6.2), the chassis shall be securely fastened within the enclosure conforming to the maintainability requirements of 3.15.3.

3.7.4.10 Pressure equalizing valve. Unless otherwise specified for class 1 equipment (see 6.2), a mechanism shall be provided for equalizing air pressure within the enclosure when the enclosure is sealed. The mechanism provided shall not protrude beyond the enclosure.

3.7.4.11 Console cabinet enclosures. When specified (see 6.2), the equipment shall be fitted with a console cabinet. The console cabinet enclosure shall provide protection for the contained equipment from the specified environmental conditions. Access to the interior of the enclosure shall be provided. With the equipment installed in the console cabinet, the console cabinet enclosure shall be designed so that the console cabinet can be lifted and transported by forklift vehicles when the console cabinet is in its normal upright position. Additional requirements for transportability shall be as specified (see 6.2).

3.7.4.12 Console cabinet work surfaces. When specified (see 6.2), equipment fitted with a console cabinet shall have work surfaces for personnel provided. Personnel work surfaces shall be constructed of nonconducting material. Any work surface that projects from the console cabinet shall not be damaged during or interfere with transport or shipping.

3.7.4.13 Rack-mounting requirements.

3.7.4.13.1 Rack-mountable enclosures. Enclosures that are required to be rack-mounted and enclosures required to accommodate rack-mountable equipment shall be in accordance with EIA/ECA-310 for a 482.6-mm (19-inch) standard panel width.

3.7.4.13.2 Convertible/rack-mountable equipment. When specified (see 6.2), the equipment shall be capable of being rack-mounted. All convertible/rack-mountable equipment shall conform to the requirements of its class when configured for rack-mounting use in accordance with 3.7.4.13.3.

3.7.4.13.3 Rack-mount conversion. Conversion shall be accomplished by use of a kit that converts the enclosure for rack-mounting but will not prevent return to the original configuration. The rack-mount conversion kit shall include all hardware required to configure the equipment for rack-mounting. When the height of the front panel is not a multiple of the preferred panel height increment or when the width is less than rack-width, the conversion kit shall include filler panels to provide the preferred height and width in accordance with 3.7.4.13.1. No part of the equipment shall protrude above or below the front panel when the enclosure is rack-mounted.

3.8 Transit case. When specified (see 6.2), all handheld (see 6.6.11) equipment and other types of equipment shall be fitted with a transit case. The transit case shall provide protection for the contained test equipment from the specified environmental conditions. The transit case is not an integral part of the test equipment. The transit case need not provide for operational capability of the equipment when enclosed. The physical characteristics of the transit case shall be as specified herein.

3.8.1 Transit case cover. The transit case shall have a cover that can be closed and fastened. Fasteners shall allow for quick opening. If the cover is removable, fasteners shall not interfere with cover removal.

3.8.2 Transit case stacking provisions. The transit case shall have a geometric configuration that permits stacking without harm to the enclosure or its contents. The maximum stacking height (expressed as a quantity of equipment in excess of one) shall be as specified (see 6.2).

3.8.3 Transit case handles. One or more handles shall be provided. The number and location of handles shall be such that the load distribution per handle shall not exceed 20 kg (44 pounds). Handles shall be located above the equipment center of gravity to ensure carrying stability. Handles shall permit compliance with the enclosure attitude provisions specified in 3.7.3.1.

3.8.3.1 Hard transit case handles. A transit case shall include hinged handles with sufficient internal clearance to allow a block 44 mm (1.75 inches) by 106 mm (4.17 inches) in cross-section with edges rounded to a 25-mm (1-inch) radius to pass through them. The grip portion of the handles shall be of a nonmetallic material at least 89 mm (3.5 inches) in length with a 19-mm (¾-inch) diameter or other approved cross-section that is shaped to fit the hand comfortably. Handles shall stop open at 90 degrees and have a retaining mechanism to keep them in the closed and 90-degree position. Handles shall be recessed or protected. A handle located on the top of the enclosure shall be recessed to facilitate stacking.

3.8.3.2 Soft transit case handles. When a soft transit case is specified (see 6.2), one or more handles shall be provided. A shoulder strap may be provided in addition to the required handles. Handles shall be attached to the case in a manner to ensure serviceability over the life of the equipment under normal conditions of use.

3.8.4 Transit case accessory stowage. The transit case shall allow for the stowage of accessories, operating instructions, removable power cables, signal leads, and designated spares. Stowage shall not adversely affect the carrying stability of the equipment and shall be contained in a manner that prevents damage to the accessories or equipment during transit.

3.8.5 Transit case corners. All hard-edged corners shall be designed to preclude injury to personnel or damage to material. All corners shall be adequately reinforced to protect the instrument from damage during the environmental conditions specified.

3.8.6 Watertight and airtight transit case pressure equalizing valve. Watertight and airtight transit cases shall have a mechanism for equalizing air pressure within the enclosure when the enclosure is sealed. The mechanism shall not protrude beyond the transit case enclosure.

3.9 Environmental requirements. Environmental performance requirements shall be as specified herein and in table II.

3.9.1 Environmental conditions. Equipment shall conform to the specified performance requirements (see 6.6.19) when subjected to the environmental conditions indicated in this specification. Combinations of environments beyond those covered by the specified test procedures (see 4.5 and 6.6.30) shall be as specified (see 6.2). Unless otherwise specified (see 6.2), equipment shall conform to the specified performance requirements when subjected to a 30-minute warm-up period preceded by a 2-hour not operating temperature stabilization period or when tested in accordance with the applicable test method (see section 4).

3.9.2 Temperature and humidity (T/H). The temperature ranges and humidity limits for both operating and not operating conditions shall be as specified herein. A relative humidity (RH) of 95 percent (with the applicable tolerance) shall be achieved in a non-condensing condition.

3.9.2.1 Temperature, not operating. Equipment shall conform to the specified performance and accuracy requirements after being stored at the temperatures specified herein for the applicable class.

3.9.2.1.1 Class 1 and 2. Class 1 and 2 equipment shall be subjected to not operating temperatures ranging from -51 to 71 °C.

3.9.2.1.2 Class 3 and 4. Class 3 and 4 equipment shall be subjected to not operating temperatures ranging from -40 to 71 °C.

TABLE II. Environmental requirements by class.

Environmental conditions Class 1/

1 2 3 4

Temperature, not operating (°C) (3.9.2.1 and 4.5.5.1) -51 to 71 -51 to 71 -40 to 71 -40 to 71

Temperature, operating (°C) (3.9.2.2 and 4.5.5.1) -40 to 55 2/ -10 to 55 0 to 50 10 to 40

RH (percent) (3.9.2.3 and 4.5.5.1) 3/ 5 to 95±5 4/, 5/ 5 to 95±5 6/, 7/ 5 to 95±5 6/, 7/ 5 to 95±5 6/, 7/ Altitude, not operating (3.9.3 and 4.5.5.2) 4600 meters 4600 meters 4600 meters 4600 meters Altitude, operating (3.9.3 and 4.5.5.2) 8/ 4600 meters 4600 meters 4600 meters 3000 meters

Vibration limits (3.9.4.1 and 4.5.5.3.3) Random 10-2000 Hz

Random 10-500 Hz

Random 5-500 Hz

Random 5-500 Hz

Loose cargo bounce (3.9.4.3 and 4.5.5.3.3) Yes Yes 9/ 9/

Functional shock (3.9.5.1 and 4.5.5.4.1) 30g 10/ 30g 10/ 30g 10/ 30g 10/

Transit drop (3.9.5.2 and 4.5.5.4.2) Yes 11/ 11/ 11/

Bench handling (3.9.5.3 and 4.5.5.4.3) Yes Yes Yes Yes High-impact shock (3.9.5.4 and 4.5.5.4.4) 9/ 9/ 9/ 9/

Watertight (3.9.6.1 and 4.5.5.5.1) Yes 9/ 9/ 9/

Splash-proof (3.9.6.2 and 4.5.5.5.2) Yes 9/ 9/ 9/

Drip-proof (3.9.6.3 and 4.5.5.5.3) N/A 9/ 9/ 9/

Fungus resistance (3.9.7 and 4.5.6.1) 9/ Yes Yes Yes Yes Salt exposure, enclosure (3.9.8.1 and 4.5.6.2.1) 9/ 48 hours 48 hours 48 hours 48 hours

Salt exposure, structural parts (3.9.8.2 and 4.5.6.2.2) 48 hours 48 hours 9/ 48 hours 9/ 48 hours 9/

Explosive atmosphere (3.9.9 and 4.5.6.3) Yes 9/ 9/ N/A Dust resistance (3.9.10 and 4.5.6.4) Yes 9/ 9/ N/A Solar radiation (3.9.12 and 4.5.6.8) 9/ 9/ N/A N/A

TABLE II. Environmental requirements by class – Continued.

NOTES:

1/ See 3.9 for complete environmental requirements.

2/ 20-minute operation at 71 °C.

3/ RH not controlled below 10 °C.

4/ 85±5% RH above 30 °C.

5/ 60±5% RH above 40 °C.

6/ 75±5% RH above 30 °C.

7/ 45±5% RH above 40 °C.

8/ Allowances shall be made for derating of high voltage accuracy to achieve required altitude denoted by a warning label viewable by the operator.

9/ When specified (see 6.2).

10/ Half-sine shock pulse (see 3.9.5.1).

11/ See 3.9.5.2, 4.5.5.4.2, and table XIII.

3.9.2.2 Temperature operating. Equipment shall conform to the specified performance and accuracy requirements while operating at the temperatures specified herein for the applicable class.

3.9.2.2.1 Class 1. Class 1 equipment shall be subjected to operating temperatures ranging from -40 to 55 °C.

Class 1 test equipment shall operate for 20 minutes at 71 °C.

3.9.2.2.2 Class 2. Class 2 equipment shall be subjected to operating temperatures ranging from -10 to 55 °C.

3.9.2.2.3 Class 3. Class 3 equipment shall be subjected to operating temperatures ranging from 0 to 50 °C.

3.9.2.2.4 Class 4. Class 4 equipment shall be subjected to operating temperatures ranging from 10 to 40 °C.

3.9.2.3 Humidity. Equipment shall conform to the specified performance and accuracy requirements for conditions where the RH is 5 to 95±5 percent in the temperature range of 10 to 30 °C and as specified herein for the applicable class. At temperatures below 10 °C, the humidity is uncontrolled, but the equipment shall conform to the specified performance requirements (after the specified warm-up period) and shall withstand the effects of humidity up to 100 percent.

3.9.2.3.1 Class 1. Class 1 equipment shall be subjected to conditions where the RH is 5 to 85±5 percent in the temperature range of 30 to 40 °C and where the RH is 5 to 60±5 percent in the temperature range above 40 °C.

3.9.2.3.2 Class 2, 3, and 4. Class 2, 3, and 4 equipment shall be subjected to conditions where the RH is 5 to 75±5 percent in the temperature range of 30 to 40 °C and where the RH is 5 to 45±5 percent in the temperature range above 40 °C (as appropriate for the specified class).

3.9.3 Altitude. Class 1, 2, and 3 equipment shall conform to the specified performance and accuracy requirements while operating at an altitude of 4600 meters and after returning from an altitude of 4600 meters when tested in accordance with 4.5.5.2. Class 4 equipment shall conform to the specified performance and accuracy requirements while operating at an altitude of 3000 meters and after returning from an altitude of 4600 meters when tested in accordance with 4.5.5.2.

3.9.4 Vibration.

3.9.4.1 Random vibration. Class 1, 2, 3, and 4 equipment shall conform to the specified performance and accuracy requirements when subjected to the random vibration conditions specified in table III in accordance with 4.5.5.3.1.

TABLE III. Random vibration by class.

Class Duration per axis (minutes)

Frequency (Hz)

Slope (dB/Octave)

PSD

(g2/Hz)

1 60 10-1000

1000-2000 ≥2000

-6

0.04

0.01 2 30 10-500 0 0.03

3, 4 10

5-100 100-137 137-350 350-500 ≥500

-6 -6

0.015

0.0075

0.0039

3.9.4.2 Sinusoidal vibration. When specified (see 6.2), class 1, 2, 3, and 4 equipment shall conform to the specified performance and accuracy requirements when subjected to the sinusoidal vibration conditions specified in table IV in accordance with 4.5.5.3.2.

TABLE IV. Sinusoidal vibration by class.

Class Frequency increments

(Hz)

Displacement peak-to-peak

(mm)

Resonance search time per increment

(minutes 1/)

Cycling time per axis

(minutes)

Resonance dwell time per axis (minutes)

1, 2 5 to 15

16 to 25 26 to 55

1.5 1.0 0.5

15 10

3, 4 5 to 55 0.33 15 15 10

NOTE:

1/ Search times specified shall be for a low frequency to high frequency to low frequency sweep of the applicable increment.

3.9.4.3 Loose cargo bounce. Unless other classes of equipment are specified (see 6.2), only class 1 and 2 equipment shall conform to the specified performance and accuracy requirements when subjected to the loose cargo bounce conditions in accordance with 4.5.5.3.3.

3.9.5 Mechanical shock.

3.9.5.1 Functional shock. Class 1, 2, 3, and 4 equipment shall conform to the specified performance and accuracy requirements when subjected to the 30g half-sine shock test of 4.5.5.4.1.

3.9.5.2 Transit drop. Equipment for which the enclosure acts as the transit case, equipment that is specified to include a transit case, and all class 1 equipment shall conform to the specified performance and accuracy requirements when subjected to the transit drop test of 4.5.5.4.2. When a soft transit case is specified (see 6.2), only those with shoulder straps shall be subjected to this test. The equipment shall remain inside the transit case throughout this test.

3.9.5.3 Bench handling. Equipment shall conform to the specified performance and accuracy requirements and there shall be no damage to any controls, indicators, or fuseholders when subjected to the bench handling test of 4.5.5.4.3.

3.9.5.4 High-impact shock. When specified (see 6.2), equipment shall conform to the specified performance and accuracy requirements when subjected to a high-impact shock test. The high-impact shock test shall be as specified (see 6.2).

3.9.6 Water resistance. Water resistance shall be as specified herein and summarized in table V.

3.9.6.1 Watertight.

3.9.6.1.1 Class 1. Class 1 equipment shall conform to the specified performance and accuracy requirements when subjected to the 0.9-meter submergence test in accordance with 4.5.5.5.1.

3.9.6.1.2 Class 2, 3, and 4. Unless otherwise specified (see 6.2), class 2, 3, and 4 equipment need not be watertight.

3.9.6.1.3 Airtight transit case. When a transit case is specified, and it is specified to be airtight (see 6.2), the transit case shall be watertight. Equipment housed in an airtight transit case shall conform to the specified performance and accuracy requirements when subjected to the 0.9-meter submergence test with the equipment in the transit case in accordance with 4.5.5.5.1.

3.9.6.2 Splash-proof.

3.9.6.2.1 Class 1. Class 1 equipment shall conform to the specified performance and accuracy requirements after covers, if present, have been removed when subjected to the splash-proof test in accordance with 4.5.5.5.2.

3.9.6.2.2 Class 2, 3, and 4. Unless otherwise specified (see 6.2), class 2, 3, and 4 equipment need not be splash-proof.

3.9.6.3 Drip-proof.

3.9.6.3.1 Class 2, 3, and 4. Unless otherwise specified (see 6.2), class 2, 3, and 4 equipment need not be drip-proof. This requirement is not applicable for class 1 equipment.

3.9.6.3.2 Hard transit case. When a hard transit case is specified (see 6.2), the transit case shall conform to the specified performance and accuracy requirements when subjected to the drip-proof test with the equipment in the transit case in accordance with 4.5.5.5.3. Testing of this requirement is not applicable for airtight transit cases.

3.9.6.3.3 Soft transit case. Unless otherwise specified (see 6.2), if a soft transit case is specified, it need not be drip-proof.

TABLE V. Water resistance.

Requirement Class 1 Class 2, 3, and 4 Transit case – general

Transit case – airtight

Transit case – hard

Transit case – soft

Watertight Submergence

0.9 m

1/ 1/ Submergence

0.9 m

1/ N/A

Splash-proof Yes 1/ N/A N/A N/A N/A Drip-proof N/A 1/ 1/ N/A Yes 1/

NOTE:

1/ When specified (see 6.2).

3.9.7 Fungus resistance. Equipment shall not contain materials that provide nutrients for the growth of fungus.

When a transit case is specified (see 6.2), it shall not contain materials that provide nutrients for the growth of fungus. Verification of fungus resistance and fungus-inert material shall be in accordance with 4.5.6.1.

3.9.8 Salt atmosphere.

3.9.8.1 Enclosure exposure. Equipment shall conform to the specified performance and accuracy requirements when subjected to the salt fog test in accordance with 4.5.6.2.1.

3.9.8.2 Structural exposure. Material used for the fabrication of panels and structural parts shall conform to all applicable requirements after being exposed for 48 hours to a 5-percent salt atmosphere in accordance with

4.5.6.2.2. Unless otherwise specified (see 6.2), testing samples of panels and structural parts for class 1 equipment shall be required.

3.9.9 Explosive atmosphere for class 1 equipment. The operation of class 1 equipment shall not cause ignition of an ambient-explosive-gaseous mixture with air when tested in accordance with 4.5.6.3.

3.9.10 Dust exposure for class 1 equipment and hard transit cases. Class 1 equipment and equipment in hard transit cases shall conform to all requirements after exposure to dust when tested in accordance with 4.5.6.4.

3.9.11 DC field (Navy) magnetic environment. When specified (see 6.2), the equipment shall conform to the performance and accuracy specified when tested in accordance with the 20-oersted DC test of 4.5.6.6.

3.9.12 Acoustic noise. Unless otherwise specified (see 6.2), equipment shall not generate acoustic noise in excess of 70 A-weighted decibels (dBA) sound pressure level (SPL) when measured at the operator and bystander positions in accordance with ISO 7779.

3.9.13 Solar radiation. When specified (see 6.2), class 1 and 2 equipment shall conform to applicable requirements after exposure to solar radiation when tested in accordance with 4.5.6.8.

3.10 Electromagnetic compatibility (EMC). EMC control for all classes of equipment shall meet the requirements in table VI when tested in accordance with 4.5.6.5.

TABLE VI. EMC requirements.

Description of requirement Test limit

Conducted…