Attachment 0001 - ANUSM-783 Electronic Counter Purchase Description (Rev -).pdf

TEMOD-23-03

Revision: -

24 October 2024

PURCHASE DESCRIPTION

FOR THE

COUNTER, ELECTRONIC:

AN/USM-783

Prepared by:

Product Director, Test, Measurement, and Diagnostic Equipment Bldg 3651, Army TACMS Drive

Redstone Arsenal, Alabama 35898-5000

Distribution Statement A: Approved for public release; distribution is unlimited.

Distribution Statement A

Table of Contents

1.0 GENERAL INFORMATION

1.1 Intended Use

1.2 Purpose

1.3 Classification

1.4 Acquisition Process

2.0 APPLICABLE DOCUMENTS

2.1 General

2.2 Government Documents

2.2.1 Specifications, Standards, Handbooks, and Data Item Descriptions

2.2.2 Other Government Documents, Drawings, Publications, and Their Associated Addendums

2.3 Non-Government Publications

2.4 Order of Precedence

3.0 GENERAL REQUIREMENTS

3.1 Equipment Components

3.2 Design and Construction

3.2.1 Self-Test

3.2.2 Front Panel Controls

3.3 Safety

3.4 Physical Characteristics

3.4.1 Weight

3.4.2 Dimensions

3.4.3 Cold Weather Operation

3.4.4 Nuclear, Biological, and Chemical (NBC) Storage

3.5 Power Source

3.5.1 Primary Power Source

3.5.2 Input Power Switch

3.5.3 Power Indicator

3.5.4 Excessive Over Current Protection

3.6 Maintainability

3.6.1 Median Time to Repair

3.6.2 Preventative Maintenance

3.6.3 Maintenance Provisions

3.6.4 Fault Isolation

3.6.5 Maintenance and Calibration During Warranty Period

3.7 Calibration

3.7.1 Calibration Access

3.7.2 Variable Value Adjustments

3.7.3 Calibration by Substitution

3.7.4 Calibration Interval

3.7.5 Mean Time to Calibrate

3.8 Reliability

3.9 Testing Requirements

3.9.1 Methods of Verification

3.9.2 Classes of Inspection

3.9.3 General Inspection Requirements

3.10 Environmental Requirements

3.10.1 Temperature and Humidity (T/H)

3.10.2 Shock and Vibration

3.10.3 Altitude

3.10.4 Water Resistance

3.10.5 Dust Resistance

3.10.6 Fungus Resistance

3.10.7 Electromagnetic Compatibility (EMC)

3.10.8 Environmental Stress Screening

3.11 Software / Firmware Requirements

3.11.1 Software Version

3.11.2 Software / Firmware Upgradeability

3.12 Accessories

3.12.1 Fuses

3.12.2 Input Power Cable

3.12.3 Coaxial Cables

3.12.4 Coaxial Adapters

3.13 Transit Case

3.13.1 Transit Case

3.13.2 Cover

3.13.3 Stacking Provisions

3.13.4 Color

3.14 Marking and Identification

3.14.1 Marking

3.14.2 Equipment Identification

4.0 OPERATIONAL REQUIREMENTS

4.1 Warmup Performance

4.2 Time Base

4.2.1 Time Base Stability

4.2.2 External Standard Input

4.2.3 External Standard Input Impedance

4.3 Front Panel Display

4.3.1 Numeric Readout

4.3.2 Gate or Measuring Time Indicator

4.4 Single Measurement

4.4.1 Reset

4.5 Self-Check

4.6 Input Characteristics

4.6.1 Common Input

4.6.2 Attenuators

4.6.3 Sensitivity

4.6.4 Dynamic Range

4.6.5 Maximum Input

4.6.6 Protection

4.6.7 Input Impedances

4.6.8 Coupling

4.6.9 Triggering

4.6.10 Arming

4.6.11 Arming Triggering

4.7 Frequency Measurements

4.7.1 Frequency Range

4.7.2 Frequency Accuracy

4.7.3 Frequency Resolution

4.7.4 Frequency LSD

4.7.5 Math Functions

4.7.6 Amplitude Peaks

4.7.7 Pulse Width

4.7.8 Rise/Fall Time

4.7.9 Phase

4.7.10 Duty Cycle

4.8 Time Interval Measurements

4.8.1 Time Interval Range

4.8.2 Time Interval Accuracy

4.8.3 Time Interval Resolution

4.8.4 Time Delay Range

4.9 Period Measurements

4.9.1 Period Range

4.9.2 Period Accuracy

4.9.3 Period Resolution

4.9.4 Period LSD

4.10 Ratio Measurements

4.10.1 Ratio Range

4.10.2 Ratio Accuracy and Resolution

4.10.3 Ratio LSD

4.11 Totalize Measurements

4.11.1 Totalize Range

4.11.2 Totalize Accuracy and Resolution

4.11.3 Totalize LSD

4.12 Outputs

4.12.1 Standard Frequency Output

4.13 Logic Interface

5.0 QUALITY ASSURANCE PROVISIONS

5.1 Responsibility for Inspection

5.2 Product Acceptance

5.3 Quality System Requirements

5.4 Inspection Equipment Calibration

5.5 Workmanship

5.6 Electrostatic Discharge

5.7 Failure Reporting, Analysis, and Corrective Action System

6.0 PACKAGING

7.0 FACILITY OF USE (FOU)

7.1 General

7.1.1 Controls

7.1.2 Wiring

7.1.3 Unsuitable Methods

7.1.4 Mechanical Stability

7.1.5 Human Factors

7.1.6 Workmanship

7.1.7 Ease of Calibration

7.1.8 Maintainability

8.0 NOTES

8.1 Glossary / Definitions

8.1.1 Accessories

8.1.2 Corrective Action

8.1.3 Fractional Frequency Error (FFE)

8.1.4 MIL-PRF-28800G Class 3

8.1.5 Mean Time Between Essential Function Failures

8.1.6 Mean Time to Calibrate

8.1.7 Median Time to Repair

8.1.8 Self-Test

8.1.9 Short Term Stability

8.1.10 Verification

8.2 Acronyms

1.0 GENERAL INFORMATION. This procurement is for a portable, general purpose, digital electronic counter that measures frequency from DC to 1.3GHz. The digital electronic counter should also be designed for measurements such as period, time interval, totalize, phase, ratio pulse width, rise/fall time, duty cycle and peak volts.

1.1 Intended Use. The Digital Electronic Counter: AN/USM-783 Electronic Counter, hereinafter referred to as AN/USM-783 Electronic Counter, is classified as a general-purpose piece of test equipment that will replace the AN/USM-459, AN/USM-459A, and AN/USM-459B Digital Electronic Counter in the Army’s inventory. It will be used by United States Forces to provide measurement functions including frequency, period, time interval, totalize, pulse width, rise/fall time, duty cycle, phase, peak voltage, and frequency ratio. The Digital Electronic Counter will be used at both the Field and Sustainment Maintenance Levels throughout the Army and will be deployed to Army Commands, Army Service Component Commands, and Direct Reporting Units as required. This instrument will be used on an “as needed” basis to measure frequency from DC to 1.3 GHz using one of three input channels to measure and display the period of a waveform, time interval between two events, pulse width of a waveform, rise or fall time of a waveform, duty cycle of a waveform, total events occurring on one input, phase difference between two signals, frequency ratio of two signals, and peak amplitude of a signal.

The Digital Electronic Counter will be used by all Communication/Electronic repair personnel performing maintenance, as directed by the Maintenance Allocation Chart of the prescribed Communication/Electronic system.

1.2 Purpose. The purpose of the AN/USM-783 Electronic Counter is to provide United States Forces the capability to provide measurement functions including frequency, period, time interval, totalize, pulse width, rise/fall time, duty cycle, phase, peak voltage, and frequency ratio.

For this mission, a general purpose digital electronic counter is required. The AN/USM-783 Electronic Counter must also operate over the specified temperature ranges as well as in the diverse regions the United States Forces are deployed.

1.3 Classification. The AN/USM-783 Electronic Counter shall meet the requirements of the Performance Specification titled, “Test Equipment For Use With Electrical and Electronic Equipment” MIL-PRF-28800G, Class 3 (defined in paragraph 8.1.4 “MIL-PRF-28800G Class 3” of this Purchase Description) as tailored by this Purchase Description.

1.4 Acquisition Process. A solicitation announcement and release will include all pertinent information for interested sources to submit their best offer. Bid samples will be required as part of the solicitation. Product Director Test, Measurement, and Diagnostic Equipment (PD TMDE) will be utilizing a Two-step Sealed Bidding acquisition process. This procurement will result in a firm-fixed-price, multiple year, indefinite delivery – indefinite quantity contract.

NOTE: This is not a solicitation and does not obligate the Government to issue a solicitation.

2.0 APPLICABLE DOCUMENTS.

2.1 General. The documents listed in this section are specified throughout this purchase description. This section does not include documents recommended for additional information or as examples. While every effort has been made to ensure the completeness of the list, users are cautioned that they must meet all specified requirements of the documents cited in this purchase description, whether or not they are listed below. And, unless otherwise specified, the latest document issued, including document revisions and addendums, are those in effect the date of the contract award.

2.2 Government Documents.

2.2.1 Specifications, Standards, Handbooks, and Data Item Descriptions. The following specifications, standards, handbooks, and data item descriptions 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.

MIL-PRF-28800G Test Equipment for use with Electrical and Electronic Equipment

MIL-DTL-17/28C Cables, Radio Frequency, Flexible, Coaxial, 50 Ohms, M17/28-RG058

MIL-PRF-55339/17B Adapter, Connector, Coaxial, Radio Frequency, “T”

(Within Series BNC Jack to Jack and Series BNC Plug to Jack) Class 2

MIL-PRF-55339/20A Adapter, Connector, Coaxial, Radio Frequency, In-Line

(Between Series BNC Jack To Series N Plug) Class 2

MIL-STD-1472H Human Engineering

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

(Copies of these documents are available online at http://quicksearch.dla.mil/)

2.2.2 Other Government Documents, Drawings, Publications, and Their Associated Addendums. The following other Government documents, drawings, publications, and their addendums 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.

ATP 3-11.32 Multi-Service Tactics, Techniques, and Procedures for Chemical, Biological, Radiological, and Nuclear Passive Defense

ATP 3-90.97 Mountain Warfare and Cold Weather Operations http://quicksearch.dla.mil/

SC 5180-91-R63 Electronic System Tool Kit: TK-17/G

(Copies of these documents are available online at http://armypubs.army.mil or will be provided by request)

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.

ANSI/ESD S20.20-2014 Protection of Electrical and Electronic Parts, Assemblies and Equipment (Excluding Electrically Initiated Explosive Devices)

ISO 9001 Quality Management Systems: Requirements

(Copies of these documents are available online or by individual search by document number)

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

IEEE-STD-488.1 IEEE Standard For Higher Performance Protocol for the

Standard Digital Interface for Programmable Instrumentation

IEEE-STD-488.2 IEEE Standard Codes, Formats, Protocols, and Common

Commands for Use With IEEE Std 488.1, IEEE Standard Digital Interface for Programmable Instrumentation

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

2.4 Order of Precedence. 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.

http://armypubs.army.mil/ http://www.ieee./

3.0 GENERAL REQUIREMENTS.

3.1 Equipment Components. The AN/USM-783 Electronic Counter shall be In Accordance With (IAW) all sections of MIL-PRF-28800G, paragraph 3.2 “Equipment components,” except for paragraph 3.2.4.1 “Material restricted for Navy use.”

3.2 Design and Construction. The AN/USM-783 Electronic Counter shall be IAW all sections of MIL-PRF-28800G, paragraph 3.3 “Design and construction” and as tailored below.

3.2.1 Self-Test. The AN/USM-783 Electronic Counter shall possess a built-in self-test (defined in paragraph 8.1.8 “Self-Test” of this Purchase Description) capability IAW MIL-PRF- 28800G, paragraph 3.3.7 “Self-test capability” to provide the operator and maintainer an indication that the AN/USM-783 Electronic Counter is operating properly. The AN/USM-783 Electronic Counter shall prevent the user from continuing with testing after a self-test failure.

3.2.2 Front Panel Controls. All displays and indicators shall be located on the front panel and shall include the following functions listed below:

a. Standby / Operate: (see paragraphs 3.5.3 & 3.5.4 of this Purchase Description)

b. Display: (see paragraph 4.3 of this Purchase Description)

c. Reset / Local: (see paragraph 4.4.1 of this Purchase Description)

d. Self check: (see paragraph 4.5 of this Purchase Description)

e. Frequencies: (see paragraph 4.7 of this Purchase Description)

f. Math Function: (see paragraph 4.7.5 of this Purchase Description)

g. Period: (see paragraph 4.9 of this Purchase Description)

h. Ratio: (see paragraph 4.10 of this Purchase Description)

i. Totalize: (see paragraph 4.11 of this Purchase Description)

j. Time Interval: (see paragraph 4.8 of this Purchase Description)

k. Gate or Measuring Time: (see paragraph 4.3.2 of this Purchase Description)

l. Coupling: (see paragraph 4.6.8 of this Purchase Description)

m. Input Impedance: (see paragraph 4.6.7 of this Purchase Description)

n. Attenuation: (see paragraph 4.6.2 of this Purchase Description)

o. Common Input: (see paragraph 4.6.1 of this Purchase Description)

p. Trigger Level: (see paragraph 4.6.9.2 of this Purchase Description)

q. Tigger Slope: (see paragraph 4.6.9.1 of this Purchase Description)

r. Function Programming Characteristics: (see paragraph 4.13.1 of this Purchase

Description)

s. Sampling Programming: (see paragraphs 4.13.1.2 of this Purchase Description)

3.3 Safety. The AN/USM-783 Electronic Counter shall meet the safety requirements IAW MIL-PRF-28800G, paragraph 3.11 “Safety.”

3.4 Physical Characteristics. The AN/USM-783 Electronic Counter shall be IAW all sections of MIL-PRF-28800G, paragraph 3.7 “Enclosure physical characteristics,” as tailored below.

3.4.1 Weight.

3.4.1.1 Without Transit Case. The AN/USM-783 Electronic Counter itself shall be classified as a handheld portable equipment IAW MIL-PRF-28800G, paragraph 6.6.20 “Portable equipment.” The maximum weight of the AN/USM-783 Electronic Counter shall not exceed 8 lbs.

3.4.1.2 With Transit Case. The AN/USM-783 Electronic Counter including transport case and accessories shall be IAW MIL-PRF-28800G, paragraph 3.7.2 “Weight.” If the weight exceeds 20 kilograms (kg) (44 lbs.), a label stating the weight information and two-person lift shall be required and affixed to the outside of the transit case.

3.4.2 Dimensions. Dimensions are specified in units of width, height, and depth of the equipment in its normal operating position IAW MIL-PRF-28800G, paragraph 6.6.8 “Dimensions.” The AN/USM-783 Electronic Counter shall be classified as a portable instrument IAW MIL-PRF-28800G, paragraph 6.6.20 “Portable equipment.”

3.4.3 Cold Weather Operation. The AN/USM-783 Electronic Counter shall allow Army operators and maintainers wearing Army issued cold weather equipment, as defined in ATP 3- 90.97, Appendix C “Army Cold Weather Uniform and Equipment Posture” to use the controls and perform the functions required to operate the AN/USM-783 Electronic Counter.

3.4.4 Nuclear, Biological, and Chemical (NBC) Storage. Army operators and maintainers shall be able to shut down and store the AN/USM-783 Electronic Counter while wearing their field duty uniform and Army issued NBC Mission Oriented Protective Posture (MOPP), Level 4 gear, as defined in ATP 3-11.32, Table 2-2 “Land and ship CBRN MOPP comparison with NATO dress states” and section 2-74.

3.5 Power Source. The AN/USM-783 Electronic Counter shall operate from an external power source. The AN/USM-783 Electronic Counter shall be IAW all sections of MIL-PRF- 28800G, paragraph 3.6.1 “Electrical power source,” except paragraph 3.6.1.2.5.4 “External battery pack,” as tailored below.

3.5.1 Primary Power Source. The AN/USM-783 Electronic Counter shall have a primary power source IAW MIL-PRF-28800G, paragraph 3.6.1.2 “Nominal and alternate power source,” option c with the following tailoring: The AN/USM-783 Electronic Counter shall operate from 120 Root Mean Squared Voltage (Vrms) plus or minus (±) 10 percent (%), single phase 50, and 60 Hz and 230 Vrms ± 10%, single phase 50, and 60 Hz. The AN/USM-783 Electronic Counter shall be IAW MIL-PRF-28800G, paragraphs 3.6.1.2.4 “Alternating signal-phase sources” and Table 1 of paragraph 3.6.1.2 “Nominal and alternate power source.”

3.5.2 Input Power Switch. The operator shall be able to energize the AN/USM-783 Electronic Counter from the front panel IAW MIL-PRF-28800G, paragraph 3.6.2.3 “Input power switch.”

3.5.3 Power Indicator. The AN/USM-783 Electronic Counter front panel shall include a visual indicator when the equipment is energized IAW MIL-PRF-28800G, paragraph 3.6.2.6 “Indicators.”

3.5.4 Excessive Over Current Protection. The AN/USM-783 Electronic Counter shall perform IAW all sections of MIL-PRF-28800G, paragraph 3.6.2.5 “Excessive current drain protection.” Automated safety mechanisms shall be incorporated to automatically isolate the AN/USM-783 Electronic Counter from the source of power in the event of current being drawn that is in excess of the equipment rating. No degradation of specifications or accuracy shall occur due to an overload or short circuit condition once the short circuit or overload is removed. Normal operation shall be restored after the short circuit or overload interruption has been removed, without requiring the use of tools to reset the protection.

If the mechanism protecting the AN/USM-783 Electronic Counter from excessive over current requires operator intervention to reset, the mechanism shall be easily accessible by the user. The over current mechanism shall be resettable or replaceable by bare hands without disassembly of the chassis.

If the excessive over current protection is a solid state device, then the interruption shall be automatically resettable when the power is disconnected, the fault is corrected, and power is reapplied or resettable from the front panel by the operator. If fuses are used as the safety mechanism the following shall apply:

NOTE: Fuses contained in a power adapter do not have to be accessible by the user.

3.5.4.1 Fuse Holders. Common or separate fuse holders may be provided. If only one fuse holder is used (common), the AN/USM-783 Electronic Counter shall be provided with the 120 Volts (V) Alternating Current (AC) fuse installed and any other required fuses shall be stowed with the accessories.

3.5.4.2 Standard Fuses. The fuses shall be standard fuses available through commercial sources.

3.5.4.3 Labeling. A label (non-removable) clearly identifying fuse rating and type shall be located near or on the fuse holder(s).

3.5.4.4 Other Methods. Other methods of interrupting an over-current condition may be proposed, and if approved, substituted for the requirements in MIL-PRF-28800G, paragraph 3.6.2.5, “Excessive current drain protection.”

3.6 Maintainability.

3.6.1 Median Time to Repair. The AN/USM-783 Electronic Counter shall have a Median Time to Repair (defined in paragraph 8.1.7 “Median Time to Repair” of this Purchase Description) rating of no more than 1.5 hours.

3.6.2 Preventative Maintenance. The AN/USM-783 Electronic Counter shall perform IAW MIL-PRF-28800G, paragraph 3.15.2 “Preventive maintenance.”

3.6.2.1 Special Tools. The AN/USM-783 Electronic Counter shall not require any special tools (defined IAW MIL-PRF-28800G, paragraph 6.6.26 “Special Tools”) or unique tools (tools that are not included in the SC 5180-91-R63 tool kit) for preventive maintenance unless such special tools are included with each AN/USM-783 Electronic Counter as an accessory.

3.6.3 Maintenance Provisions. The AN/USM-783 Electronic Counter maintainability characteristics shall perform IAW all sections of MIL-PRF-28800G, paragraph 3.15.3 “Maintenance provisions” as tailored below:

3.6.3.1 Tools Required for Maintenance. The AN/USM-783 Electronic Counter shall allow maintenance access to the AN/USM-783 Electronic Counter utilizing the SC 5180-91-R63 tool kit.

3.6.3.2 Ease of Access, Adjustment, and Removal. The AN/USM-783 Electronic Counter shall have easy access to the interior parts, terminals, and wiring for maintenance and required circuit checking. Maintenance adjustments shall not require the removal of any component, printed circuit card, or subassembly unless extender boards are provided for this purpose. Printed circuit cards shall be removable without the need to unsolder cables and interconnecting wiring. Printed circuit cards (motherboards) designed primarily to distribute power and signals to other printed circuit cards (daughter-boards) are excluded from this requirement. The printed circuit cards shall be accessible from both sides. Unsoldering of wires, wire harnesses, parts or subassemblies shall not be required in order to gain access to terminals, soldered connections, mounting screws and the like for calibration purposes. The use of extender cards or cables is permitted.

3.6.3.3 Accessibility for Repair. The AN/USM-783 Electronic Counter shall incorporate chassis subassemblies that can be removed without removing other hardwired subassemblies IAW all sections of MIL-STD-1472H, paragraphs 5.9.19 “Tools,” 5.9.5.1 “Separate adjustability,” and 5.9.6 “Access and accessibility.”

3.6.3.4 Printed Circuit Cards. The AN/USM-783 Electronic Counter shall perform IAW all sections of MIL-STD-1472H, paragraph 5.9.20 “Printed circuit boards” for printed circuit cards (mother boards) designed primarily to distribute power and signals to other printed circuit cards (daughter boards) to be accessible from both sides.

3.6.3.5 Accessibility for Adjustment. The AN/USM-783 Electronic Counter shall permit personnel to make adjustments without removing any component, printed circuit cards, or subassembly, excluding the installation of extender boards IAW all sections of MIL-STD- 1472H, paragraph 5.9.17.2 “Adjustment.”

3.6.4 Fault Isolation. The AN/USM-783 Electronic Counter shall be IAW all sections of MIL-PRF-28800G, paragraph 3.15.1 “Fault isolation.”

3.6.5 Maintenance and Calibration During Warranty Period. Government technicians performing normal maintenance or company directed warranty work while following manufacturer approved procedures printed in the maintenance manuals shall not void the warranty.

3.7 Calibration. The AN/USM-783 Electronic Counter shall meet the following calibration requirements:

3.7.1 Calibration Access. The AN/USM-783 Electronic Counter shall require no unsoldering of wires, wire harnesses, parts or subassemblies for a maintainer to gain access to terminals, soldered connections, mounting screws for calibration purposes; the use of extender cards or cables shall be permitted IAW all sections of MIL-STD-1472H, paragraphs 5.9.19 “Tools,”

5.9.5.1 “Separate adjustability,” and 5.9.6 “Access and accessibility.”

3.7.2 Variable Value Adjustments. The AN/USM-783 Electronic Counter shall allow calibration by variable value components and shall be adjustable by means of tools contained in the SC 5180-91-R63 tool kit, or by variable parameters stored in non-volatile memory.

3.7.3 Calibration by Substitution. The calibration of an AN/USM-783 Electronic Counter by substitution of selected components or parts is unacceptable.

3.7.4 Calibration Interval. The AN/USM-783 Electronic Counter shall maintain a calibration interval (defined IAW MIL-PRF-28800G, paragraph 6.6.7 “Calibration interval”) that meets the tolerance specifications for no less than 12 months IAW MIL-PRF-28800G, paragraph

3.13 “Calibration interval.”

3.7.5 Mean Time to Calibrate. The AN/USM-783 Electronic Counter shall have a Mean Time to Calibrate (defined in paragraph 8.1.6 “Mean Time to Calibrate” of this Purchase Description) that does not exceed two hours.

NOTE: Calibration time shall not include the time to repair and readjust the AN/USM-783 Electronic Counter because of malfunction.

3.8 Reliability. The AN/USM-783 Electronic Counter shall have a Mean Time Between Essential Function Failures (defined in paragraph 8.1.5 “Mean Time Between Essential Function Failures” of this Purchase Description) of no less than 2,700 hours. The Median Time to Repair for all Unscheduled Maintenance Demands (UMDs) at the field level shall not exceed 1.5 hours. The Maximum Time to Repair shall not exceed two (2) hours for 90% of all UMDs at field level.

3.9 Testing Requirements. A Product Verification Test Plan (PVTP) shall be written after contract award that describes the test procedures for all requirements in paragraphs 3.0 “General Requirements” and 4.0 “Operational Requirements” of this Purchase Description, unless exempted by the Government. Unless otherwise specified in the contract or purchase order, all testing requirements shall be conducted IAW the methods and procedures defined in paragraphs

3.9.2.2 “Product Verification Testing” of this Purchase Description.

3.9.1 Methods of Verification. The accepted methods that shall be utilized to accomplish verification (defined in paragraph 8.1.10 “Verification” of this Purchase Description) are:

3.9.1.1 Analysis. Analysis is a method of verification that utilizes established technical or mathematical models or simulations, algorithms, charts, graphs, circuit diagrams, or other scientific principles and procedures to provide evidence that state requirements were met.

3.9.1.2 Demonstration. Demonstration is a method of verification, which generally involves the actual operation, adjustment, or re-configuration of equipment to provide evidence that the designed functions were accomplished under specific scenarios. Given input values are entered and the resulting output values are compared against the expected output values. The equipment may be instrumented during a demonstration and quantitative limits of performance may be monitored.

3.9.1.3 Examination. Examination is a method of verification consisting of investigation, without the use of special laboratory appliances or procedures, of equipment to determine conformance to specified requirements that can be determined by such investigations.

Examination is generally nondestructive and typically includes the use of sight, hearing, smell, and touch; simple physical manipulation; mechanical and electrical gauging and measurement;

and other forms of investigation.

3.9.1.4 Test. Testing is a method of verification that generally denotes the determination, by physical means, of the properties or elements of equipment, including functional operation, and involves the application of established scientific principles and procedures. It consists of a procedure, sequence, or action performed on equipment for the purpose of- determining the performance characteristics of equipment while functioning under controlled conditions. Testing is an examination, evaluation, observation, or trial used under actual or simulated environmental operating conditions to determine and document capabilities and characteristics of a product.

3.9.2 Classes of Inspection.

3.9.2.1 Bid Sample Testing. Bid Sample Test inspections (referred to in MIL-PRF- 28800G as bid sample inspection, paragraphs 4.2 and 6.3 “Bid Sample inspection”) shall be required, before contract award. Specific instructions regarding arrangements for examinations and disposition of the bid samples will be provided in the invitations for bids.

3.9.2.2 Product Verification Testing. Product Verification Test (PVT) inspections (referred to in MIL-PRF-28800G as first article inspection, paragraphs 4.3 and 6.4 “First article inspection”) shall be required, after contract award. The AN/USM-783 Electronic Counter unit

(s) used for testing shall be from a production-representative lot. Commercial testing and acceptance practices may be proposed in lieu of any or all of Product Verification Testing requirements, and if approved by the procuring agency, the proposed testing and data generated by that testing may be substituted for the testing requirement.

3.9.2.3 Acceptance Inspection. Each unit shall be subjected to the demonstrations, examinations, and tests IAW paragraph 5.2 “Product Acceptance”, of this Purchase Description.

3.9.3 General Inspection Requirements.

3.9.3.1 Inspection Methods. Unless otherwise specified in the contract or delivery order, all inspections shall be conducted IAW the methods and procedures defined in paragraphs

3.9.1 “Methods of Verification” of this Purchase Description. When specific methods and procedures are not specified, methods and procedures necessary to verify compliance to the performance requirements defined in paragraphs 3.0 “General Requirements” and 4.0 “Operational Requirements” of this Purchase Description shall be contractor developed and United States Government approved.

3.9.3.2 Operational Test. An operational test shall be used IAW MIL-PRF-28800G, paragraph 4.5 “Examination and test methods” prior to, during (as applicable), and after each environmental test to verify compliance with paragraph 3.10 “Environmental Requirements” of this Purchase Description.

3.9.3.3 Test Item Configuration. Unless otherwise specified, the test item configuration shall be an AN/USM-783 Electronic Counter. Other accessories, cables, etc. shall be included as necessary to verify specified performance requirements.

3.9.3.4 Standard Test Conditions. Unless otherwise specified in the environmental test procedures, all measurements, and tests shall be made at standard test conditions IAW MIL- PRF-28800G, paragraph 4.5.1.1 “Test conditions.”

3.9.3.5 Failure Criteria. Unsuccessful completion of the operational test or any performance requirements as defined in paragraphs 3.0 “General Requirements” and 4.0 “Operational Requirements” of this Purchase Description shall constitute a failure and shall be cause for rejection of the unit and/or lot as applicable.

3.10 Environmental Requirements. The AN/USM-783 Electronic Counter shall perform IAW the environmental requirements, either separately or in any natural combination thereof, of MIL-PRF-28800G for Class 3 equipment (defined in paragraph 8.1.4 “MIL-PRF-28800G Class 3” of this Purchase Description) and as tailored below. Operational testing (defined in paragraph

3.9.3.2 “Operational Test” of this Purchase Description) shall be performed before and after all tests listed below. All of the following tests shall be conducted on the AN/USM-783 Electronic Counter itself, unless this Purchase Description specifically states that the AN/USM-783 Electronic Counter is to be enclosed in the transit case.

3.10.1 Temperature and Humidity (T/H).

3.10.1.1 T/H Operating with Primary Power Source. The AN/USM-783 Electronic Counter, using the primary power source (see paragraph 3.5.1 “Primary Power Source” of this Purchase Description), shall perform according to the requirements of this purchase description during and following exposure to temperatures ranging from -0°C to +50°C (32°F to +122°F) as specified IAW MIL-PRF-28800G, paragraph 3.9.2.2 “Temperature operating.” These requirements shall be verified by testing IAW MIL-PRF-28800G, all sections of paragraph

4.5.5.1 “Temperature and humidity (T/H) tests” (including 4.5.5.1.1 “T/H procedure”, 4.5.5.1.1.1 “Temperature test procedure”, and 4.5.5.1.1.2 “Humidity cycle procedure”).

3.10.1.2 T/H Non-Operating. The AN/USM-783 Electronic Counter shall perform according to the requirements of this purchase description prior to and following exposure, while in a fully loaded transit case in a non-operating state, to temperatures ranging from –40°C to +71°C (–40°F to +159.8°F) as specified IAW MIL-PRF-28800G, paragraph 3.9.2.1 “Temperature, not operating.” These requirements shall be verified by testing IAW MIL-PRF- 28800G, all sections of paragraph 4.5.5.1 “Temperature and humidity (T/H) tests” (including

4.5.5.1.1 “T/H procedure”, 4.5.5.1.1.1 “Temperature test procedure”, and 4.5.5.1.1.2 “Humidity cycle procedure”).

NOTE: The above test is for the AN/USM-783 Electronic Counter itself, not for the transit case.

3.10.2 Shock and Vibration.

3.10.2.1 Transit Drop. The AN/USM-783 Electronic Counter, while enclosed in a hard transit case in a non-operating state with all accessories, shall perform according to the requirements of this purchase description prior to and after being dropped as specified IAW MIL-PRF-28800G, paragraph 3.9.5.2 “Transit drop.” These requirements shall be verified by testing IAW MIL-PRF-28800G, paragraph 4.5.5.4.2 “Transit drop test”.

3.10.2.2 Bench Handling. The AN/USM-783 Electronic Counter, shall conform to the specified performance and accuracy requirements and there shall be no damage to any controls, indicators, or fuse holders when subjected to bench handling as specified IAW MIL-PRF- 28800G, paragraph 3.9.5.3 “Bench handling.” These requirements shall be verified by testing IAW MIL-PRF-28800G, paragraph 4.5.5.4.3 “Bench handling test”.

3.10.2.3 Functional Shock. The AN/USM-783 Electronic Counter shall perform to the specified performance and accuracy requirements when subjected to the 30g half-sine shock as specified IAW MIL-PRF-28800G, paragraph 3.9.5.1 “Functional shock.” These requirements shall be verified by testing IAW MIL-PRF-28800G, paragraph 4.5.5.4.1 “Functional shock test.”

3.10.2.4 Random Vibration. The AN/USM-783 Electronic Counter shall perform according to the requirements of this purchase description prior to and after being exposed to random vibrations as specified IAW MIL-PRF-28800G, paragraph 3.9.4.1 “Random vibration” using conditions specified in Table III “Random vibration by class” for Class 3 equipment.

These requirements shall be verified by testing IAW MIL-PRF-28800G, paragraph 4.5.5.3.1 “Random vibration test” using Figure 13 “Vibration profile for class 3 and 4.”

3.10.3 Altitude. The AN/USM-783 Electronic Counter shall perform to the specified performance and accuracy requirements non-operating at an altitude of 4600 meters and after returning from an altitude of 4600 meters IAW MIL-PRF-28800G, paragraph 3.9.3 “Altitude.”

These requirements shall be verified by testing IAW the requirements specified in MIL-PRF- 28800G, paragraph 4.5.5.2 “Altitude test.”

3.10.4 Water Resistance.

3.10.4.1 Transit Case Drip-proof. The AN/USM-783 Electronic Counter, while enclosed in a hard transit case in a non-operating state with all accessories, shall perform according to the requirements of this purchase description prior to and after being subjected to the drip-proof test IAW MIL-PRF-28800G, paragraph 3.9.6.3.2 “Hard transit case.” These requirements shall be verified by testing IAW MIL-PRF-28800G, paragraph 4.5.5.5.3 “Class 2, 3, and 4 and hard transit case drip-proof test.”

3.10.4.2 Enclosure Salt Fog. The AN/USM-783 Electronic Counter, while enclosed in a hard transit case in a non-operating state with all accessories, shall perform according to the requirements of this purchase description prior to and after being subjected to method 509.7 (salt fog) as specified in MIL-STD-810G, IAW MIL-PRF-28800G, paragraph 4.5.6.2 “Salt fog tests.”

These requirements shall be verified by testing IAW MIL-PRF-28800G, paragraph 4.5.6.2.1 “Enclosure (salt fog test).”

3.10.5 Dust Resistance. The AN/USM-783 Electronic Counter, while enclosed in the hard transit case in a non-operating state with all accessories, shall perform according to the requirements of this purchase description during and following exposure to a dust environment as specified in IAW MIL-PRF-28800G, paragraph 3.9.10 “Dust exposure for class 1 equipment and hard transit cases.” These requirements shall be verified by testing IAW MIL-PRF-28800G, paragraph 4.5.6.4 “Dust resistance test (class 1 and hard transit case).”

3.10.6 Fungus Resistance. The AN/USM-783 Electronic Counter and transit case shall not contain materials that provide nutrients for the growth of fungus for a period of no less than 28 days as specified in IAW MIL-PRF-28800G, paragraph 3.9.7 “Fungus resistance.” These requirements shall be verified by testing IAW MIL-PRF-28800G, paragraph 4.5.6.1 “Fungus resistance test.” Each of the five species of test fungus as specified IAW MIL-STD-810H, Method 508.8, Table 508.8-I. TEST FUNGUS shall be used. Any fungal growth on the test item shall be evaluated by technically qualified personnel (e.g., microbiologists).

3.10.7 Electromagnetic Compatibility (EMC). The AN/USM-783 Electronic Counter shall perform according to the requirements of this purchase description prior to, during, and after exposure to conducted emissions, conducted immunity, radiated emissions, radiated immunity, and electrostatic discharge immunity as specified in IAW MIL-PRF-28800G, paragraph 3.10 “Electromagnetic compatibility (EMC)”. These requirements shall be verified by testing IAW MIL-PRF-28800G, paragraph 4.5.6.5 “EMC test.”

3.10.8 Environmental Stress Screening. All sections of MIL-PRF-28800G, paragraph

3.16 “Environmental stress screening (Applicable to Class 1 ONLY)” are not applicable.

3.11 Software / Firmware Requirements.

3.11.1 Software Version. The AN/USM-783 Electronic Counter shall be delivered with the latest version of software installed at the time of delivery.

3.11.2 Software / Firmware Upgradeability. The Software / Firmware of the AN/USM- 783 Electronic Counter shall be upgradeable to the latest versions available using Army approved systems.

3.12 Accessories. The accessories (defined in paragraph 8.1.1 “Accessories” of this Purchase Description) shall be packed within the hard transit case.

3.12.1 Fuses. For each fuse contained in the AN/USM-783 Electronic Counter, two spare fuses shall be provided in a small, plastic fuse case / box that meets best commercial practices to contain fuses, if applicable.

3.12.2 Input Power Cable. A detachable input power cable that operates with 110 – 240 VAC at 50 – 60 Hz IAW MIL-PRF-28800G, paragraph 3.6.2.2 “Input power cable” shall be provided with the AN/USM-783 Electronic Counter.

3.12.3 Coaxial Cables. A minimum of five coaxial cables with BNC male connectors on each end shall be provided with the AN/USM-783 Electronic Counter. Each cable shall be at a minimum 48 inches in length and shall conform to characteristics IAW MIL-DTL-17/28C.

3.12.4 Coaxial Adapters. A minimum of two coaxial in series “T” adapters with BNC male to double female connectors shall be provided with the AN/USM-783 Electronic Counter.

Each adapter provided shall conform to characteristics IAW MIL-PRF-55339/17B. Also, a minimum of two coaxial BNC female to Type N adapters shall be provided with the AN/USM- 783 Electronic Counter. Each adapter provided shall conform to characteristics IAW MIL-PRF- 55339/20A.

3.13 Transit Case.

3.13.1 Transit Case. The AN/USM-783 Electronic Counter shall come with a hard transit case that provides protection for the contained test equipment, accessories, and over-packed items IAW MIL-PRF-28800G, paragraph 3.8 “Transit case” and shall conform to the environmental conditions specified in paragraph 3.10 “Environmental Requirements.”

NOTE: The transit case is not an integral part of the test equipment; therefore, the transit case need not provide for operational capability of the equipment when enclosed.

3.13.2 Cover. The transit case shall have a cover that can be closed and fastened with fasteners that allow for quick opening IAW MIL-PRF-28800G, paragraph 3.8.1 “Transit case cover”.

3.13.3 Stacking Provisions. The transit case shall have a geometric configuration that permits stacking without harm to the enclosure or its contents IAW MIL-PRF-28800G, paragraph 3.8.2 “Transit case stacking provisions” with a maximum stacking height of six transit cases.

3.13.4 Color. The transit case shall be neutral in color (e.g. desert tan, olive green, black), excluding white.

3.14 Marking and Identification. The AN/USM-783 Electronic Counter marking and identification shall be IAW all sections of MIL-PRF-28800G, paragraph 3.12 “Marking and identification” as tailored below:

3.14.1 Marking. The AN/USM-783 Electronic Counter shall be IAW all sections of MIL- PRF-28800G, paragraph 3.12.1 “Marking.” In addition, all replaceable assemblies, subassemblies, modules, and printed circuit card assemblies shall also be individually marked in a permanent fashion with either the manufacturer’s Commercial and Government Entity (CAGE) Code and manufacturer’s part number or a unique identification which allows the Government to determine the CAGE Code and manufacturer’s part number.

3.14.2 Equipment Identification. The AN/USM-783 Electronic Counter equipment identification markings shall be as specified IAW all sections of MIL-PRF-28800G, paragraph

3.12.2 “Equipment Identification.” The AN/USM-783 Electronic Counter shall have plates/labels permanently affixed to the outside of its case as described below.

3.14.2.1 Identification Plates/Labels. Identification plates/labels (equipment labels, warranty labels, calibration labels, etc.…) shall be constructed of a material and affixed in such a manner to allow for identification for a minimum of ten (10) years. The equipment identification plates/labels information/text shall be marked on the plates/labels in a color which contrasts with the color of the surface of the plates/labels. The equipment identification plates/labels shall have no sharp edges or burrs. The contractor shall permanently affix the plates/labels to the equipment at no additional cost to the Government and shall be capable of:

(a) withstanding the environmental extremes,

(b) withstanding approved cleaning procedures, and

(c) no degradation of legibility.

The equipment identification plates/labels shall not:

(a) Be placed across cover joints,

(b) Be placed over screw heads to prevent access to the inside of the equipment, or

(c) Be placed over other information or warning labels.

3.14.3 Transit Case Identification Plate/Label. The contractor shall provide an identification plate/label on the transit case as specified IAW MIL-PRF-28800G, paragraph 3.12.3 “Transit case identification plate.” The contractor shall construct the transit case identification plate/label of a material and affixed in such a manner to allow for identification for a minimum of ten (10) years. The transit case identification plate/label information/text shall be marked on the plates in a color, which contrasts with the color of the surface of the plate. The transit case identification plate/label shall have no sharp edges or burrs. The transit case identification plate/label shall be located on the transit case cover. This procedure will allow the Government to identify the equipment in the shipping containers without opening the transit case.

4.0 OPERATIONAL REQUIREMENTS.

The specifications provided below are the minimum requirements and accuracies that will meet the Government’s need. The AN/USM-783 Electronic Counter shall at least meet these requirements and accuracies and may provide better performance.

4.1 Warmup Performance. Warmup time shall not exceed one minute after the operate mode is selected when time has previously elapsed in the standby mode to permit the time base to stabilize to the degree required for the measurement IAW the requirements of paragraphs 4.2 through 4.2.1.7 of this Purchase Description.

4.2 Time Base. Time base specifications are given in terms of Fractional Frequency Error (FFE) (defined in paragraph 8.1.3 “Fractional Frequency Error (FFE)” of this Purchase Description). Except for temperature stability, all time base requirements are specified under standard test conditions IAW MIL-PRF-28800G, paragraph 4.5.1.1 “Test conditions.” Time base requirements are specified for measurement from the 10 MHz standard output.

4.2.1 Time Base Stability. The AN/USM-783 Electronic Counter shall comply with the requirements as described below.

4.2.1.1 Long Term Stability (Aging Rate). The aging rate shall be less than + 5 x 10-10 per 24 hours after 24 hours of operation preceded by at least 24 hours with no source power applied.

4.2.1.2 Frequency Retrace. Thirty minutes after application of source power, following at least a 24-hour period of non-operation, the FFE shall be within + 3 x 10-8 of the frequency immediately prior to the 24-hour period of non-operation. The FFE 5 hours after application of source power, following at least a 24-hour period of non-operation, shall be within + 1 x 10-8 of the frequency immediately prior to the 24-hour period of non-operation. The 24-hour period of non-operation shall be preceded by at least 24 hours of operation.

4.2.1.3 Restabilization. The FFE 5 hours after application of source power shall be within + 5 x 10-9 of the frequency measured 24 hours after application of source power.

Application of source power shall be preceded by no more than 24 hours of non-operation.

4.2.1.4 Short Term Stability. The short-term stability (defined in paragraph 8.1.9 “Short Term Stability” of this Purchase Description) shall be less than 1 x 10-10 root mean square (rms) 30 minutes after application of source power and less than 1 x 10-11 rms 5 hours after application of source power. Application of source power shall be preceded by at least 24 hours with no source power applied.

4.2.1.5 Stability During Power Change. The FFE shall not change more than +1 x 10-8 during the first 2 minutes after any power change within the specified steady stated band no more than 1 x 10-9 at the end of the 2 minutes (Ref. paragraph 3.5 “Power Source” as specified in this Purchase Description).

4.2.1.6 Stability During Temperature Change. The FFE shall not change more than +10 x 10-9 total for any incremental or total temperature change within the specified temperature operating range.

4.2.1.7 Oscillator Adjustments. The internal time base oscillator shall be capable of being adjusted so that the 10MHz standard output shall be within +1 part in 109 of an external 10 MHz standard. The total range of adjustment shall be at least +1 part in 107 from 10MHz.

4.2.2 External Standard Input. The AN/USM-783 Electronic Counter shall be capable of specified operation from any 10MHz external frequency standard having a value of 1Vp-p into 50 Ω with performance at least equal to paragraph 4.2 “Time Base” as described by this Purchase Description. When the external standard is used, it shall be in lieu of the internal standard.

4.2.3 External Standard Input Impedance. The load impedance at the equipment external standard input port on the rear panel of the equipment shall be 1 KΩ nominal paralleled by not more than 60 picofarad (pF).

4.3 Front Panel Display. The AN/USM-783 Electronic Counter shall possess a Graphic Users Interface (GUI) to all visual representation of all instrument signal characteristics. The GUI shall have at a minimum a readable numeric readout.

4.3.1 Numeric Readout. The numeric readout shall be at least a nine character, in line, horizontal, single plane, digital display at least 10mm (0.4 inches) high. Provisions shall be included to test all light emitting segments of the display device.

4.3.1.1 Measurement Units. Measurement units (frequency and time) IAW paragraphs a and b shall be displayed in conjunction with the numeric display.

a. Frequency: MHz, kHz, Hz, or Hz with proper exponent.

b. Time: s, ms, µs, ns, or s with proper exponent.

4.3.1.2 Display Storage. The numeric readout shall be continuous and change only when the measurement is different from that counted during the previous measurement cycle.

4.3.2 Gate or Measuring Time Indicator. A front panel indicator shall indicate gate opening and closing.

4.4 Single Measurement. The AN/USM-783 Electronic Counter shall include provisions to take a single cycle measurement and hold the display until a new measurement is taken.

4.4.1 Reset. The reset control shall allow manual initiation of the gate.

4.5 Self-Check. A self-check function shall be provided to verify functional operation of the frequency measurement mode.

4.6 Input Characteristics. Two channels shall have identical characteristics and shall be capable of high impedance (1 MΩ) and 50 Ω use. The third channel shall be provided for 50 Ω use only. For clarity, the high impedance channels are identified and Channel A and Channel B, and the 50 Ω only channel is identified as Channel C.

4.6.1 Common Input. Provisions shall be made for selection of common or separate input.

During common input the signal applied to Channel A shall be applied to both Channels A and B, and Channel B shall be isolated.

4.6.2 Attenuators. Separate attenuators shall be provided for Channels A and B which operate manually or automatically when the input signal level crosses either a nominal 5Vp-p or a nominal +5V threshold.

4.6.3 Sensitivity. The sensitivities for Channels A and B shall be at least 20 mVrms to ± 5 V ac + dc from 0 Hz to 100 MHz for sine waves, 30 mVrms to ± 5 V ac + dc from 100 to 200 MHz, and 40 mVrms to ± 5 V ac + dc from 200 to 225. The sensitivity for Channel C shall be at least -27 dBm to +19 dBm from 100 MHz to 1.3 GHz for sine waves.

4.6.4 Dynamic Range. Within the constraints of the maximum input without damage requirement specified in paragraph 4.6.5 of this Purchase Description, the dynamic ranges of Channels A and B shall be at least 100 mV to 5 Vp-p up to 20 MHz and at least 100 mV to 2.5 Vp-p to 100 MHz. The dynamic range of Channel C shall be at least 15 mVrms to 500 mVrms from 100 MHz to 200 MHz, 15 mVrms to 1 Vrms from 200 MHz to 500 MHz.

4.6.5 Maximum Input. The maximum input without damage for Channels A and B, in high impedance (1 MΩ), shall be at least 200V (DC plus peak AC) from DC to 3.5 kHz, 5 x 105 Vrms divided by frequency from 3.5 kHz to 100 kHz and 5Vrms from 100 kHz to 100MHz. The maximum input without damage from Channels A and B in 50 Ω shall be at least 5Vrms.

4.6.6 Protection. Channel C shall be protected to prevent damage from input signals with levels up to at least 8V (DC + peak AC). Protective devices designed to open circuit permanently to comply with this requirement shall be replaceable from the front panel without special tools.

4.6.7 Input Impedances. The input impedances of Channels A and B shall each be 1 MΩ nominal shunted by not more than 60pF. When Channels A and B are shunted in common input configuration (Ref. paragraph 4.6.1 “Common Input” as specified in this Purchase Description), the input impedance shall be 1 MΩ nominal shunted by not more than 85pf.