CSS 19-NI001.pdf

CSS 19-NI001 REV B

CALIBRATION STANDARDS SPECIFICATION

PROCUREMENT PACKAGE

NAVY SECONDARY VIBRATION

CALIBRATION SYSTEM

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

SEP 2020

DISTRIBUTION STATEMENT A: APPROVED FOR PUBLIC RELEASE, DISTRIBUTION IS

UNLIMITED.

CALIBRATION STANDARDS SPECIFICATION

PROCUREMENT PACKAGE

Navy Secondary Vibration Calibration System

Prepared by:

Anh Nguyen

(Project Lead)

Navy Primary Standards Laboratory Metrology Calibration Engineering Branch

P.O. Box 357058 San Diego, CA 92135-7058

DEPARTMENT OF THE NAVY METROLOGY AND

CALIBRATION PROGRAM

Accelerometer Calibration System Specification CSS 19-NI001 REV B

Table of Contents

1 SCOPE

1.1 General

1.2 Usage

1.3 Classification

2 APPLICABLE DOCUMENTS

2.1 Reference documents

2.2 Order of precedence

3 REQUIREMENTS

3.1 Safety

3.2 Equipment components

3.3 Design and construction

3.4 Digital interface

3.5 Electrical power sources and connections

3.6 Marking and identification

3.7 Environmental requirements

3.8 Performance requirements

3.9 Calibration requirement

3.10 Functional requirement

3.11 Mechanical/Electrical design requirement

3.12 Controller requirement

3.13 Fault isolation

3.14 Maintenance provision

3.15 Calibration

3.16 Reliability

3.17 Workmanship

1 SCOPE

1.1 General. This document specifies the minimum requirements for the Secondary Vibration Calibration System. For the purpose of this Calibration Standard Specification (CSS), the Secondary Vibration Calibration System shall be referred to as the SVCS. It is intended to be used by Navy personnel in shore-based Depot laboratories. Operator control functions shall be clearly identified and marked as well as all functions will be documented in the user’s manual. The SVCS will be used to calibrate vibration transducers commonly seen in NAVAIR such as piezoelectric accelerometers, high impedance, low impedance and velocity transducers. The system is capable of simultaneously measuring either charge or voltage mode via separate inputs for both the device under test (DUT) and reference accelerometer.

This purchase description details two parts to this acquisition: One part is a SVCS where each system includes the following components: Rack Mounted Desktop PC with internal Data Acquisition Card (DAC) and Function Analyzer, Vibration Calibration Software, Shaker with accompanying Power Amplifier and Power Supply/Pressure Regulator, Internal Reference Accelerometer with Dual (or two Single) Amplifier and Signal Conditioner. In addition, the second part will be a Transfer Standard (Reference) Accelerometer, in which each will utilize an Amplifier previously mentioned. This vibration standard shall be used by the Navy to calibrate IEPE, Charge and Voltage accelerometers, sensors with voltage outputs from external signal conditioners and inductance type velocity transducers, and the system shall be upgradeable to calibrate piezoresistive and capacitive transducers. The SVCS shall conform to the applicable sections of International Organization for Standardization (ISO) 16063-21, Vibration by Comparison to a Reference Transducer, unless otherwise stated in this Purchase Description.

The manufacturer shall submit a technical description or product literature for the equipment it is proposing, which clearly identifies the manufacturer, make and model. The offeror must demonstrate that its proposed equipment meets or exceeds each minimum requirement described in this solicitation by providing a citation to the relevant section of its technical description or product literature.

1.2 Usage. US Navy civilian and support contractor personnel will use the SVCS.

Equipment covered by this CSS is intended for use in testing equipment and systems in the controlled environments in which test equipment is operated. The requirements of this CSS are tailored to the intended use of the equipment.

1.3 Classification. Test equipment specified herein is categorized by class, (requirements arising from the intended operational environment), as specified below in 1.3.1 Class through 1.3.3 Color. The class is assigned by the most severe environmental condition expected for the equipment.

1.3.1 Class. The SVCS shall conform to Class 4 requirements in accordance with MIL- PRF-28800F for Navy shore-based laboratory use as specified in this CSS.

1.3.2 Enclosure. For the purpose of this CSS, the enclosure refers to the rack/bench required as a foundation and workspace for the SVCS and drawer space required for the storage of all accessories delivered with the SVCS.

1.3.3 Color. The color of the equipment and transit cases shall be the color normally provided by the manufacturer.

2 APPLICABLE DOCUMENTS

2.1 Reference Documents. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issues of these documents shall be those in effect on the date of this solicitation.

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-PRF-28800F - Test Equipment for use with Electrical and Electronic Equipment, General Specification for.

(Copies of DoD specifications are available online at http://quicksearch.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-130 - Standard Practice of Identification Marking of

U.S. Military Property

(Copies of DoD Standards are available online at http://quicksearch.dla.mil/or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI-Y32.2 - Graphic Symbols For Electrical and Electronic Diagrams

ANSI-Y32.16 - Standard Reference Designations for Electrical and Electronics Parts and Equipment

(Copies of ANSI documents are available from http://webstore.ansi.org/ or ANSI Attn:

Customer Service Department, 25 W 43rd Street, 4th Floor, New York, NY, 10036

INTERNATIONAL ELECTROTECHNICAL COMMISSION (IEC)

IEC 60488-2 - Standard Digital Interface for Programmable Instrumentation

IEC 61010-1 - Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use (General Requirements)

(Copies of IEC documents are available online at http://www.iec.ch/ or EC publications are available in the US from the Sales Department. American National Standards Institute, 11 West 42nd Street,113 Floor, New York, NY 10036, USA.)

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 7779 - Measurement of Airborne Noise Emitted by

Information Technology and Telecommunications Equipment

ISO 16063-21 - Method for calibration of vibration and shock transducers

(Copies of ISO documents are available online at http://www.iso.org/iso/home.html or International Organization for Standardization (ISO) 1, ch. de la Voie-Creuse, Case postale 56, CH-1211 Geneva 20, Switzerland)

2.2 Order of Precedence. In the event of conflict between the text of this CSS and the references cited herein, the text of this specification shall take precedence.

Nothing in this CSS, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3 REQUIREMENTS

3.1 Safety. The equipment shall comply with the safety requirements of IEC 61010-1.

For safety ground all accessible surfaces of the equipment shall be at ground potential. Power cables shall include a safety ground conductor. This is also true of drawer assemblies; disconnecting the safety ground shall also disconnect the power conductors.

3.2 Equipment Components. Parts, materials, and process shall be as specified below in 3.2.2 Interchangeability through 3.2.3.3 Combination of materials and shall permit the equipment to comply with the requirements of this CSS.

3.2.1 Finish. Unless otherwise specified the equipment shall be the finish normally

3.2.2 Interchangeability. A model number shall be designated for all units 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. The contractor shall immediately inform the procuring activity of any conflict between the interchangeability requirements of this specification and the purchase description.

3.2.3 Restricted materials. Restricted materials shall be as specified below in 3.2.3.1 Material restricted for Navy use through 3.2.3.3 Combination of materials.

3.2.3.1 Materials restricted for Navy use. The materials and parts specified in a through c shall not be used in equipment for the Navy.

a. Mercury, including mercury batteries.

b. Radioactive material.

c. Lithium electrochemical cells.

3.2.3.2 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

3.2.3.2.1 Organic materials. Test equipment shall not contain materials prone to organic decay or that act as a nutrient for the growth of multi-celled organisms.

3.2.3.2.2 Flammable materials. Test equipment component/s shall not contain materials that ignite into flames at operating or storage temperatures.

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

3.2.3.2.4 Carcinogens. Certain chemicals have been identified in the Occupational

Safety and Health Act (OSHA) as cancer-producing substances (carcinogens).

Before using any materials that might contain these chemicals, the materials shall be evaluated in accordance with 3.1 Safety.

3.2.3.2.5 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.

3.2.3.3 Combination of materials. The equipment shall contain no combination of materials that cause deterioration of any material contained in the equipment due to the effects of outgassing.

3.3 Design and Construction. The test equipment shall be designed and constructed to permit compliance with all applicable requirements of its class as defined in this

CSS, as well as the performance, measurement uncertainty, and other requirements in this CSS.

3.3.1 Operator adjustments and controls. Operator adjustments and controls shall be as specified below in 3.3.1.1 Operator adjustments and 3.3.1.2 Operator controls.

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

3.3.1.2 Operator controls. Operating controls and indicators shall be readily accessible to the operator. The readings presented on the controls and indicators shall be available to the operator without the need for operator conversion or calculation.

3.3.2 Connectors, electric. Provision shall be made to ensure that connectors will be mated only 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.

3.3.3 Wiring, internal. Internal wiring practices shall be such that the wiring shall not be damaged during normal maintenance and calibration.

3.3.4 Internal cooling. The equipment shall be capable of operating without interruption for at least 24 hours at the maximum operating temperature as specified in this CSS without overheating, losing power or otherwise exhibiting failure.

3.3.4.1 Cooling devices. Cooling devices used in the equipment shall be an integral part of the equipment and not degrade any aspect of performance or safety.

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

3.3.6 Self-test capability. The SVCS shall perform an automatic diagnostic self-test at startup. The self-test shall determine operational readiness and isolate faulty component(s). The information provided by the self-test shall indicate operational readiness. If failure occurs, the associated lowest replaceable unit (LRU) causing the malfunction shall be identified.

3.4 Digital interface. A digital interface shall be provided and shall meet the requirements as specified below in 3.4.1 Digital interface requirements. The digital interface shall include an IEEE 488.2 General Purpose Interface Bus conforming to IEC 60488-2:2004 and an RS-232 serial port conforming to TIA- 232-F.

3.4.1 Digital interface requirements. The digital interface shall have the programmable capability to control the various SVCS functions including all ranges, modes, and levels. The hardware protocol and programming command sets shall be documented and provided via electronic media. Primary power control and other non-measurement functions need not be controllable through the digital interface.

The digital interface shall also support printing of test results.

3.5 Electrical power source and connections. The electrical power sources and connections shall be as specified below in 3.5.1 Electrical power source and 3.5.2 Electrical power connections.

3.5.1.1 Nominal and alternate power source. The equipment shall operate at the nominal values for voltage and frequency as specified in a and b below. An alternate power source is not required.

a. The nominal voltage shall be 120 V or 240 V (±10%).

b. The nominal frequencies shall be single phase 50 Hz and 60 Hz (±5%).

3.5.1.1.1 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% of nominal or frequency falls in the range of 0 to 90% 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.

3.5.1.1.2 Battery restrictions. For Navy applications, the use of lithium and mercury batteries is restricted and shall not be used in equipment. An exception is made for small lithium batteries used for memory backup. A label containing the following caution and information shall be affixed to the outside of the unit, as applicable for either lithium or mercury batteries:

THIS UNIT CONTAINS LITHIUM BATTERIES

Battery Manufacturer:

Battery Part Number:

THIS UNIT CONTAINS MERCURY BATTERIES

Battery Manufacturer:

Battery Part Number:

3.5.2 Electrical power connections. The requirements specified in 3.5.2.1 Input power cable through 3.5.2.4 Indicators shall apply to the equipment. The equipment shall operate with a ground at the primary power.

3.5.2.1 Input power cable. The input power cable shall be a detachable power cable

3.5.2.2 Input power switch. The operator shall be able to energize the equipment via an input power switch. A standby capability may be incorporated to activate and deactivate the equipment. If such a capability is provided, suitable warnings shall be placed in the operating and service manuals and on the equipment to warn the operator of possible shock hazards during servicing, due to partially activated power supplies.

3.5.2.3 Excessive current drain protection. An automated safety mechanism (circuit breaker/fuse) 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 readily available to the operator. Safety breaker or fuse shall be implemented on the input power line side (minimum) with external access to the breaker or fuse.

3.5.2.4 Indicators. Visual indication shall be provided on the front panel to indicate when the equipment is energized.

3.6 Marking and identification. Marking and identification of test equipment shall be as specified below in 3.6.1 Marking through 3.6.2 Equipment identification.

3.6.1 Marking. Test equipment shall be marked in a manner that does not adversely affect safety or performance.

3.6.1.1 Reference designations. Reference designations shall be used to identify each part for its particular circuit application. Subminiaturized and non-repairable assemblies need not be marked with reference designations.

Reference designator usage shall be in accordance with ANSI Y32.2 and

ANSI Y32.16.

3.6.1.2 Warning markings. Warning markings shall warn of the location, the nature, and the extent of a hazard. Letters of warning markings shall be of clearly legible gothic capitals. Warning markings shall have high contrast between the letter and background colors. The markings shall be as permanent as normal life expectancy of the test equipment, and located as close as possible to the point of danger. Warning markings indicating circuits of more than 500 Vdc or Vrms shall read:

DANGER HIGH VOLTAGE (maximum applicable voltage) VOLTS

3.6.1.3 Battery warning label. Equipment containing batteries shall be provided with a battery warning label attached to the equipment. Battery warning labels shall be as specified below:

3.6.1.4 Panel markings and processes. Panel markings shall enable the operator to identify the functions and use of all items requiring operator intervention.

3.6.2 Equipment identification. All equipment, excluding small accessory items contained within a reusable pouch or container, shall be identified with the items specified in a through d.

a. Manufacturer name

b. Equipment model number with installed options

c. Equipment nomenclature

d. Serial number

3.6.2.1 Identification plate. An equipment identification plate shall be affixed to the test equipment enclosure when the enclosure also serves as the transit case. The identification plate shall contain the information provided below in 3.6.2.1.1 Identification plate. The identification plate shall be permanently affixed.

3.6.2.1.1 Identification plate. The identification plate shall contain the information in a through f.

a. Configuration model number

b. Configuration nomenclature

c. Configuration CAGE

d. Component nomenclature

e. Component part number

f. Component serial number

3.6.2.1.2 Identification plate, supplemental. When accessories are required to meet the requirements of the CSS and the combination is given a part or model number designation that differs from that of the main unit, there shall be a supplemental identification plate containing the information in a and b. The plate shall be placed on the accessory container, as applicable. Whether or

WARNING

REMOVE BATTERIES BEFORE SHIPMENT OR INACTIVE

STORAGE OF 30 DAYS OR MORE.

NOTE: DO NOT REMOVE INTERNAL MEMORY BACKUP

BATTERIES.

not a configuration model designation is assigned to the accessory or group of accessories, all major accessories shall be marked as in c:

a. Model configuration number: (Model number assigned to the equipment configuration).

b. Consists of: [part number of all components (excluding cables and adapters) comprising the equipment configuration].

c. Part of (or p/o): (Model number assigned to the equipment configuration, or main unit model number, as applicable), s/n: (serial number assigned to the equipment comprising the set or the serial number of the primary instrument if a separate s/n is not assigned to the set).

3.6.2.1.3 Identification plate shall be corrosion resistant material.

3.6.2.1.4 Identification plate, marking. The plate background color shall be black. It shall have a minimum character size of 1/8 inch. All characters shall be permanent using best commercial practices for laser engraving, etching, or photosensitive marking of material.

3.6.2.2 Reusable pouch or container. If a reusable pouch or container is provided, containers shall be marked "accessories for use with" (test equipment nomenclature or model number), or, "maintenance aids for use with" (test equipment nomenclature or model number), as applicable.

3.6.2.3 Item unique identification (IUID). A two dimensional Unique Identification (UID) data matrix conforming to MIL-STD-130 shall be included on the Identification Plate.

3.6.2.3.1 IUID data elements. The following is required per DFARS clause 252.211-

7003, Paragraph 4(e):

• UID Type

• Issuing Agency Code

• UID Data Element

• Enterprise ID

• Original Part Number

• Serial Number

• Quantity Shipped

• Unit of Measure

• Description

• Unit Acquisition Cost

• Current Part Number Effective Date

• Current Part Number

3.7 Environmental requirements. The SVCS environmental performance requirements shall be as specified below in 3.7.1 Warm-up through 3.7.4 Acoustic noise. It shall conform to the specified performance when subjected to the environmental conditions of this specification.

3.7.1 Warm up. The SVCS shall comply with the specified performance requirements after a 1 5 -minute warm-up period preceded by a 24-hour not operating temperature stabilization period. The temperature and humidity during the stabilization period shall be within the specified operating conditions of 3.7.2.1.

Temperature operating and 3.7.2.3 Humidity operating.

3.7.2 Temperature and humidity. The temperature ranges and humidity limits for both operating and not operating conditions shall be as specified in 3.7.2.1 Temperature not operating through 3.7.2.3 Humidity operating.

3.7.2.1 Temperature not operating. The SVCS shall conform to the specified performance and accuracy requirements after being stored in a dry condition at temperatures ranging from -30 ºC to 70 ºC.

3.7.2.2 Temperature operating. The SVCS shall conform to the specified performance and accuracy while being operated in ambient temperatures over the range of 60 ºF to 85 ºF inclusive.

3.7.2.3 Humidity operating. The SVCS shall conform to the specified performance and accuracy for conditions where the relative humidity is 20 to 60 ± 5 percent.

3.7.3 Altitude. The SVCS components shall conform to the specified performance and accuracy requirements after being subjected to an altitude of 15,000 feet for 1 hour with equipment not operating.

3.7.4 Acoustic noise. The SVCS shall not generate acoustic noise in excess of 80 dBA sound pressure level (SPL) when measured at the operator position, in accordance with ISO 7779.

3.7.5 Compressed Air Requirement. Provide air filtration and dryer system to ensure the air supplied to the air bearing exciter is free of particles, oil and water. First stage filtration shall remove water and particulate to 3-5 micron or better. Second stage coalescing filtration shall filter down oil aerosols to 0.001 ppm and particulate to

0.01 micron or better. The air dryer shall be at maximum 35-40 º F pressure dew point at 100-125 psi. The air filtration and dryer system shall be able to connect to a 9/16’’-18 air supply line.

3.8 Performance requirements. US Navy civilian and support contractor personnel will use the SVCS. Equipment covered by CSS is intended for use in testing equipment and systems in the controlled environments in which test equipment is operated.

The requirements of this CSS are tailored to the intended use of the equipment.

3.8.1 Operational frequencies: 2 Hz to 20 kHz

3.8.2 Acceleration: 1 to 33 g rms where g = 32.1740 ft/sec2 or 9.80665 m/sec2

3.8.3 Units of Measure: Acceleration (g) ft/sec2 or m/sec2; Velocity in/sec (ips) or m/sec at a minimum.

3.8.4 Support Device Under Test (DUT) Ranges:

a. Charge: 0.1 pC/g to 1000 pC/g

b. Voltage: 0.1 mV/g to 1000 mV/g

c. Velocity: 10 mV-sec/in to 1048 mV-sec/in

3.8.5 Provide System Uncertainty Budget documentation:

a. Measurement uncertainties shall be specified over the entire range of operation with emphasis on the range defined in ISO 16063-21. The maximum measurement uncertainties of the magnitude must not exceed the following values for complex sensitivity of accelerometers over the following intervals:

o For 2 Hz to <10 Hz, +/- 2.5% o For 100 Hz &160 Hz, +/- 0.75% o For 10 Hz to ≤ 1000 Hz, +/- 1.0% o For 1000 Hz to ≤ 5 kHz, +/- 1.25% o For 5 kHz to ≤ 10 kHz, +/- 1.75% o For 10 kHz to <20 kHz +/- 5%

Exception: If the system consists of multiple exciters, DUTs with mass above 150 grams and require calibration on a high force rating exciter due to the DUTs’ amplitude and mass requirement will be held to a different uncertainty requirement. For these DUTs, the maximum uncertainty must not exceed the following values for complex sensitivity of accelerometers over the following intervals:

o For 10 Hz to <100 Hz, +/- 1.65% o For 100 Hz &160 Hz, +/- 1.0% o For 100 Hz to ≤ 2 kHz, +/- 1.25% o For 2 kHz to <7 kHz, +/- 4.0%

If the proposal consists of multiple exciters solution, the uncertainty budget for each individual exciter type must be provided and comply with the uncertainty requirement as stated in 3.8.5 a).

b. Manufacturer shall clearly provide an uncertainty budget and calculation for each claim in 3.8.5a that list out in detail all the factors contributing to the uncertainty magnitude. The measurement uncertainty shall be given following the procedures in the ISO/IEC Guide to Uncertainty in Measurement (GUM).

The combined standard uncertainty of calibration products, using a coverage factor of 2 (k=2) to provide a 95% confidence level, shall be based on the methodology described by ISO16063-21 and NIST Technical Note 1297 along with the other uncertainty components as listed below:

o Laser Calibration of reference transducer and any other standards used to calibrate the SCVS o Effect of calibration less than Reference amplitude o Base Strain Sensitivity of Reference o Nonlinearity of Reference Sensor o Reference signal-to-noise effects o Mounting Surface Perpendicularity to axis of motion o Reference Sensitivity Drift o Sensitivity of Conditioning Amplifier o Voltage Ratio Error o Influence from Relative Motion, including mass loading effect o Influence from non-linearity of amplifier o Influence from magnetic field from exciter o Influence from Temperature Variation o Influence from Vertical and Horizontal Transverse Motion o Influence from acceleration distortion o Influence of mounting parameters, cable, plug, torque o Difference between Reference level before and after measurement o Nonlinearity of Reference Signal Conditioner o Sensitivity of Conditioning Amplifier calibration o Gravity Influence o Magnetic Influence o Distortion Influence o Frequency measurement o Resolution

c. Manufacturer shall provide two separate uncertainty budgets for the two different traceability chains of the reference accelerometer. The first uncertainty budget is by calibrating the reference accelerometer with a transfer standard and the second uncertainty budget is by sending the reference accelerometer directly to a National Measurement Institute (NMI) such as NIST (National Institute of Standards and Technology).

3.8.6 The SVCS displacement/stroke (peak to peak) shall be able to deliver up to a minimal of 1 g rms acceleration at the lowest required frequency of 2 Hz.

3.8.7 The SVCS shall be capable of calibrating DUTs at the following combined frequency, amplitude and DUT weights conditions while still meeting the uncertainty budget stated in 3.8.5a: 1) DUTs up to 700 grams at an amplitude and frequency of at least 10 g rms and 6000 Hz, respectively 2) DUTs up to 125 grams at an amplitude and frequency of at least 1 in/sec and 2000 Hz, respectively. 3) DUTs up to 650 grams at an amplitude and frequency of at least 20 g rms and 1000 Hz, respectively.

3.8.8 The minimal axial resonance frequency of the moving element assembly is at least 50 kHz.

3.8.9 Provides amplitude linearity verification check from 1 g to 20 g at the DUT’s (listed in Table 2) reference frequency.

3.8.10 Signal generation system to drive the shakers that meets the following minimum specification:

3.8.10.1 Sine wave mode: Continuous and stepped, linear and logarithmic, with a range of 1 mHz to 30 kHz

3.8.10.2 RMS amplitude range: 1mV to 3 V

3.8.11 Input/signal conditioning that meets the following minimum specification:

3.8.11.1 Input for charge and voltage, IEPE (Integral Electronic Piezoelectric)

3.8.11.2 Frequency range DC to 30 kHz

3.8.11.3 Peak amplitude range: 1 pC to 10 nC (charge) and 10 mV to 10 V (voltage)

3.8.11.4 High pass filter setting: DC; either 0.1 Hz or 0.2 Hz

3.8.12 Support multiples sensors types: high impedance/charge mode accelerometer, low impedance accelerometers with constant current supply, electromagnetic velocity transducer, piezoelectric velocity transducer, piezoresistive, integrated electronics piezoelectric accelerometer (IEPE).

3.9 Calibration Requirement.

3.9.1 Calibration of individual test, measurement and diagnostic equipment that makes up the SVCS shall be accomplished by comparison to external standards traceable to an international standards organization, such as NIST.

3.9.2 A statement of conformance, calibration and traceability shall be provided with each individual piece of the measurement instruments that makes up an individual SVCS unit.

3.9.3 The design of the instrument shall readily provide accessible calibration and maintenance adjustments. All calibration adjustments shall be designed to bring the SVCS back to its ideal theoretical operational condition within certain defined limits, e.g. corrections shall not cover for a defective SVCS.

3.9.4 All peculiar calibration fixtures and accessories needed for full calibration of the SVCS, such as plug-in extension boards, cables, special adapters, and special tools, shall be furnished with each unit delivered.

3.9.5 The company shall provide all the necessary mechanical and/or electrical equipment and tool for performing calibration and/or adjustment of the SCVS.

3.9.6 The company shall provide the uncertainty value for all the electronics and equipment besides the reference accelerometer used to calibrate the SVCS.

3.9.7 The calibrations of the SVCS shall be performed with electrical and mechanical standards that are commercial off the shelf (COTS) items.

3.9.8 The calibration coefficients generated from gain calibrations of charge, voltage, and IEPE amplifiers over the frequency range 2 to 20 kHz must be capable of being stored, accessed, and then applied during the calibration of the vibration transducers.

3.10 Functional Requirement

3.10.1 Power Requirements: 110V or 240 V @ 20 amps/50-60 Hz

3.10.2 Resonant search capability to 50,000 Hz

3.10.3 Operating System and Software: All software must run under Microsoft Windows

10 Professional

3.10.4 Calibration Interval: The SVCS shall be able to meet and maintain all performance specification as indicated for a minimum of one year.

3.10.5 All operations of the SVCS shall be performed using controller commands or front panel controls on associated test equipment, with the exception of normal power-up procedures. All test equipment controls shall be labeled to indicate their functions.

3.10.6 The operator shall be able to view the current (real time) DUT and Reference Transducer signal output on a displayed screen. Software shall provide warning on signal deviation (e.g phase, amplitude) between DUT and Reference Transducer that would impact calibration accuracy.

3.10.7 The operator shall be able to view in real time the signal-to-noise ratio, as well as the voltage level of both the DUT and reference transducer. The voltage shall be appropriately averaged to show the relative magnitude of the two signals.

3.10.8 System shall capture and display the waveforms driving the vibration generator and received from the DUT and reference accelerometer or provide external access to those waveforms, or both.

3.10.9 The power amplifier to drive the shakers shall meet the minimum performance of the system.

3.10.10 System can operate in constant voltage and constant current amplification mode.

3.10.11 The operator shall be able to create a test profile with the desired frequency and amplitude level. The system should be capable of generating a report of calibration that at a minimal contain the sensitivity value reported in terms of pC/g or mV/g as in the tabulated format shown in Table 1 together with a plot of % deviation vs.

frequency value. The exact ordering of values in the table is not required, but the fact that at a minimum these values are stated in human readable format is required.

Table 1:

Frequency (Hz)

Applied Acceleration

Peak (g)

Sensitivity (pC/g)

Deviation

Pass/Fail Estimated Uncertainty

For K=2

3.10.12 The shaker vibration level shall be able to be set and adjusted in units of displacement, velocity or acceleration.

3.10.13 The SVCS software shall have mechanism to prohibit the shaker from exceeding the vibration limits of the given shaker and amplifier.

3.11 Mechanical/Electrical Design Requirement

3.11.1 Shaker Mounting Surface: Table 2 provides a list of the major Navy workload that utilizes the SVCS. Contractor shall refer to Table 2 for the requirements listed in item 3.11.2 to 3.11.7

Table 2: SCVS Workload:

Nomenclature Model/Part # CAGE

Velocity Transducer 4-128-0006 09384

Voltage Mode Piezoelectric 308B 52581

Voltage Mode Piezoelectric 728A 53126

Voltage Mode Piezoelectric M1020 54526

Voltage Mode Piezoelectric 1020S 54526

Voltage Mode Piezoelectric MOD1020S 54526

Voltage Mode Piezoelectric 1576AS537-1 47181

Voltage Mode Piezoelectric 6021C 54526

Voltage Mode Piezoelectric 6036C 54526

Voltage Mode Piezoelectric 7251-100 95411

Voltage Mode Piezoelectric 7251A-100 95411

Voltage Mode Piezoelectric 13955 99866

Voltage Mode Piezoelectric 6050 54526

Voltage Mode Piezoelectric 4514-B-004 R0009

Voltage Mode Piezoelectric 5310M1 2W033

Voltage Mode Piezoelectric 7751-500 95411

Voltage Mode Piezoelectric 353B17 52681

Voltage Mode Piezoelectric 8742A5 58679

Velocity Transducers- Piezoelectric Type 7310 99866

Velocity Transducers- Piezoelectric Type

(H1/CH46/C130/P3) 99866

Velocity Transducers- Piezoelectric Type 797V 3X699

Velocity Transducers- Piezoelectric Type 69-100-0074 3X699

Velocity Transducers- Piezoelectric Type 1576AS537-1 07571

Velocity Transducers- Piezoelectric Type 4-131-0147 09384

Accelerometer - Piezoelectric Charge Mode 2213 95411

Accelerometer - Piezoelectric Charge Mode 2213E 95411

Accelerometer - Piezoelectric Charge Mode 2213M5 95411

Accelerometer - Piezoelectric Charge Mode 2215D 95411

Accelerometer - Piezoelectric Charge Mode 2215E 95411

Accelerometer - Piezoelectric Charge Mode 2217E 95411

Accelerometer - Piezoelectric Charge Mode 2220C 95411

Accelerometer - Piezoelectric Charge Mode 2220D 95411

Accelerometer - Piezoelectric Charge Mode 2221F 95411

Accelerometer - Piezoelectric Charge Mode 2222B 95411

Accelerometer - Piezoelectric Charge Mode 2224C 95411

Accelerometer - Piezoelectric Charge Mode 2226C 95411

Accelerometer - Piezoelectric Charge Mode 2233E 95411

Accelerometer - Piezoelectric Charge Mode 2270 95411

Accelerometer - Piezoelectric Charge Mode 2271A 95411

Accelerometer - Piezoelectric Charge Mode 2271AM20 24235

Accelerometer - Piezoelectric Charge Mode 2272 95411

Accelerometer - Piezoelectric Charge Mode TL3122-6 24235

Accelerometer - Piezoelectric Charge Mode 3023M1 07571

Accelerometer - Piezoelectric Charge Mode 3030 07571

Accelerometer - Piezoelectric Charge Mode 4371 27591

Accelerometer - Piezoelectric Charge Mode 4381 R0009

Accelerometer - Piezoelectric Charge Mode 4383 R0009

Accelerometer - Piezoelectric Charge Mode 6222M20 95411

Accelerometer - Piezoelectric Charge Mode 6222M46 95411

Accelerometer - Piezoelectric Charge Mode 6222S100 95411

Accelerometer - Piezoelectric Charge Mode 6222S100A 95411

Accelerometer - Piezoelectric Charge Mode 6233 95411

Accelerometer - Piezoelectric Charge Mode 6233C50 95411

Accelerometer - Piezoelectric Charge Mode 7201-50 95411

Accelerometer - Piezoelectric Charge Mode 7704A-50 95411

Accelerometer - Piezoelectric Charge Mode 4371V 27591

Accelerometer - Piezoelectric Charge Mode 144-202-000-303 S3960

Accelerometer - Piezoelectric Charge Mode 510TX 07571

Accelerometer - Piezoelectric Charge Mode 6240M4 95411

Accelerometer - Piezoelectric Charge Mode 302-031 56492

Accelerometer - Piezoelectric Charge Mode 7240B 95411

Accelerometer - Piezoelectric Charge Mode 7240C 95411

Velocity Transducer - Electromagnetic Type 4-102-0001 09384, 14028

Velocity Transducer - Electromagnetic Type 4-103-0001 09384, 14028

Velocity Transducer - Electromagnetic Type 4-106-0001 09384, 14028

Velocity Transducer - Electromagnetic Type 4-106-0002 09384, 14028

Velocity Transducer - Electromagnetic Type 4-123-0001 09384, 14028

Velocity Transducer - Electromagnetic Type 4-125-0001 09384, 14028

Velocity Transducer - Electromagnetic Type 4-125-0112 09384, 14028

Velocity Transducer - Electromagnetic Type 4-125-L207 09384

Velocity Transducer - Electromagnetic Type 4-125-0111 09384, 14028

Velocity Transducer - Electromagnetic Type 4-128-0001 09384, 14028

Velocity Transducer - Electromagnetic Type 4-128-0002 09384, 14028

Velocity Transducer - Electromagnetic Type 4-128-0008 09384

Velocity Transducer - Electromagnetic Type 4-131-0123 09384

Velocity Transducer - Electromagnetic Type 4-131-0147 09384

Velocity Transducer - Electromagnetic Type 4-137-0106 09384

Velocity Transducer - Electromagnetic Type 544 97240

Velocity Transducer - Electromagnetic Type 4-137-0007 09384

Accelerometers - Triaxial Voltage Mode Piezoelectric 1576AS305-1 47181, 07571,53126, 30003

Accelerometers - Triaxial Voltage Mode Piezoelectric DI103 47181

Accelerometers - Triaxial Voltage Mode Piezoelectric 2258A-100 95411

Accelerometers - Triaxial Voltage Mode Piezoelectric T049149-3 2W033 Accelerometers - Triaxial Voltage Mode Piezoelectric 46A16 95411 Accelerometers - Triaxial Voltage Mode Piezoelectric 46A17 95411

3.11.2 Contractor shall provide the necessary test instrument mounting fixture(s) with the hole pattern and thread size that will be compatible for mounting multiple DUT types as listed in Table 2 and is flexible, replaceable. Mounting plate material shall not compromise the specification on test accuracy and uncertainty measurement.

3.11.3 The size of the mounting plate shall be large enough such that there is no overhanging of the DUTs. If the SCVS happens to be a multiple shaker set-up, the minimum accelerometer mounting surface diameter should be 3.25 inch for the particular shaker(s) that supports the larger, heavier vibration transducer.

3.11.4 Contractor shall provide the DUT Accessory Kit that corresponds with the DUT’s provided in Table 2. The kit shall contain all the necessary combination of cables, mounting hardware (e.g. connector, adapter, screws, studs, pins connector), accelerometer mounting plates, external power supply, resistors to appropriately connect the DUT to the SVCS and to generate output reading.

3.11.5 Provide the appropriate support fixture for the Engine Vibration Monitoring (EVM) accelerometer with heavy integrated cable that is non-removable in Table 2. The fixture shall minimize cable movement during calibration but still provide sufficient slack in the cable to allow for the travel of the shaker table and accelerometer.

3.11.6 The contractor shall supply together with the SVCS all the necessary low noise, coaxial, BNC, microdot and power cable for connection compatibility between the DUT listed in Table 2 with the signal conditioner and power amplifier for the SVCS.

3.11.7 All items from 3.11.2 to 3.11.6 must be provided in a corrosion resistant tool box with appropriate labeling by the nomenclature of each component.

3.11.8 The system shall contains all necessary electronics and equipment such that the user would not have to utilize external voltage/power source, current supply, matching impedance resistors in conjunction with the DUTs listed in Table 2 during calibration.

3.11.9 Mounting plate flatness shall be within 5 um.

3.11.10 Perpendicularity of mounting holes to mounting surface shall not exceed 10 um.

3.11.11 Mounting surface shall be perpendicular to axis of motion.

3.11.12 If the SVCS consists of multiple exciters, there shall not be a need for the operator to disassemble parts or interchange cabling when operating between the different exciters. It is required that all the exciters are compatible to a single user controller interface on the SVCS.

3.11.13 The process of using the rubber bands/flexure to adjust and balance the armature shall not exceed 5 minutes.

3.11.14 Shaker Material:

3.11.14.1 If beryllium is utilized in the shaker design, it is required that:

3.11.14.2 The company shall provide appropriate engineering control and personal protective equipment (PPE) to comply with OHSA’s beryllium standard. Per OSHA’s beryllium standard, 29 CFR 1910.1024, the permissible exposure limit of 0.2 micrograms per cubic meter of air (μg/m3), averaged over 8-hours (PEL- TWA) shall not be exceeded. The short term exposure limit (STEL) of 2 μg/m3 over a 15-minute sampling period shall not be exceeded by the user for operation or allowable maintenance activities.

3.11.14.3 The beryllium mounting plate and/or insert shall be coated with a nontoxic material.

3.11.15 Physical material properties of the armature:

3.11.15.1 Maximum allowable coefficient of thermal conductivity referenced at 23 °C is

220 W/(m K) shall not be exceeded.

3.11.15.2 Maximum allowable coefficient of thermal expansion referenced to 23 °C is

11.3 × 10-6/K shall not be exceeded.

3.11.16 The system shall be equipped with mechanical isolation to prevent ambient noise or noise generated by the system from degrading its performance.

3.11.17 The system must be equipped with electric isolation to prevent formation of grounding loops. Grounding shall be designed to guarantee good ground isolation and the prevention of ground loops.

3.11.18 All peculiar calibration fixtures and accessories needed for full calibration of the SVCS, such as plug-in extension boards and special tools shall be furnished with each unit delivered.

3.11.19 It is required that the reference transducer set(s) can be removed from the exciter for laser calibration at a higher echelon laboratory without damaging any of the exciter internal components.

3.12 Controller Requirement

3.12.1 A rack mounted desktop controller is required that can efficiently operate under the Microsoft 10 Professional operating system. The Controller must meet or exceed Windows 10 Professional hardware requirements

3.12.2 Requires a color laser printer with at least 600 dpi resolution.

3.12.3 Requires an Intel Core i5 desktop processor or otherwise equivalent or better generation.

3.12.4 Requires a minimum of 8 GB system memory

3.12.5 At a minimum, the following types of input/output interface connections must be available on the controller or via port replication:

3.12.6 At a minimum contains one 100/1000 BaseT Ethernet RJ45 port.

3.12.7 Four integrated USB 3.0 compliant ports

3.12.8 Minimum 25-inch LCD Color Display Panel with at least 1920 x 1080 resolution

3.12.9 At a minimum 1 TB Hard Disk Drive.

3.12.10 Reads and writes to a variety of media formats, including DVD+R/RW, DVD- R/RW and CD-R/RW.

3.12.11 At a minimum graphic card driven by 3GB GDDR5 that supports Windows Display Driver (WDDM 2.0).

3.12.12 All software must run under Microsoft Windows 10 Professional as a non-elevated or admin user.

3.12.13 Any additional hardware required to make this system function to the specifications in this CSS document shall be provided by the contractor.

3.12.14 All major components of the system must be commercially available and fully supportable by commercial sources.

3.13 Fault isolation. The design of the equipment shall permit isolation of faults, and repair down to the component item or lowest replaceable unit (LRU) with the maintenance provisions furnished. Refer to MIL-PRF-28800F paragraph 6.5.2.18 Non-repairable subassembly for a definition of a non-repairable subassembly.

3.14 Maintenance provisions. Equipment shall be as specified in a through d to facilitate maintenance:

a. Accessibility for maintenance. The equipment shall be designed to ensure that any necessary maintenance access can be accomplished utilizing ordinary tools. The equipment shall be constructed so that no damage to any component shall occur and no permanent distortion to any structural member shall be caused during maintenance and calibration.

b. Calibration and alignment software instructions. For any equipment requiring the ACS display during calibration, the calibration and alignment software and instructions shall be stored in the SVCS software file or firmware. Any calibration data entered shall be stored in memory for future recall, display, and printing via the digital interface.

3.15 Calibration. For the purpose of this CSS, calibration refers to the process of comparing a test instrument with a calibration standard to determine the indicated error at specified test points. Alignment refers to the process of characterizing and adjusting a test instrument to cause it to indicate within its specified accuracy.

1. Calibration standards. For all calibrated items the SVCS shall be able to utilize existing commercially available calibration standards that meet necessary minimum performance requirements to satisfy an adequate traceable calibration. The technical information, including software, necessary to calibrate the SVCS shall be provided so that the calibration can be performed by the Navy.

2. Alignment data. If the equipment has alignment data stored in memory (e.g.: EEPROM, data files, DACs, etc.) that is necessary for the equipment to meet its performance specification, and modification of this alignment data is necessary after repair or a calibration failure, the equipment shall be designed so that the alignment can be performed by the Navy.

3.16 Reliability. The design of the equipment shall be such that under normal use, operation and planned preventive maintenance, the equipment does not fail within one year or 1500 hours of operation, whichever comes first, with a statistical certainty of 95%. The manufacturer shall provide a summary of maintenance records to establish the validity of the statistical assertion. If records of the actual equipment model offered are not available, records from a similar model may be substituted. The manufacturer shall be able to reasonably establish the claim that the offered equipment shall provide reliability similar to the model used to provide substitute records. Routine periodic cleaning of equipment is considered planned preventive maintenance.

3.17 Workmanship. The manufacture, assembly and packaging of the items covered by this CSS shall conform to the requirements of this CSS. All items will remain securely held in place during normal transit. Protection shall be afforded for the equipment on all sides to avoid transient damage.