NPSL PVCS CSS Primary_Redacted.pdf

CSS 24-NI001

CALIBRATION STANDARDS SPECIFICATION

PROCUREMENT PACKAGE

NAVY PRIMARY VIBRATION

CALIBRATION SYSTEM

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

JAN 2024

DISTRIBUTION STATEMENT A: APPROVED FOR PUBLIC RELEASE, DISTRIBUTION IS

UNLIMITED.

CALIBRATION STANDARDS SPECIFICATION

PROCUREMENT PACKAGE

Navy Primary Vibration Calibration System

Prepared by:

J T Schmidt 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

Primary Accelerometer Calibration System CSS 19-NI001

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 Primary Vibration Calibration System. For the purpose of this Calibration Standard Specification (CSS), the Primary Vibration Calibration System shall be referred to as the PVCS. It is intended to be used by Navy personnel in Navy Primary Standard laboratories. Operator control functions shall be clearly identified and marked as well as all functions will be documented in the user’s manual. The PVCS will be used to calibrate secondary vibration systems commonly seen in NAVAIR to calibrate systems 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 from primary calibration methods such as laser interferometry.

This purchase description details two parts to this acquisition: One part is a description of the PVCS 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, a Frequency Stabilized Helium-Neon Laser Source and a Michelson Interferometer, Photo Detector, I/Q Demodulator and support equipment to allow for verification of function of each component. This vibration standard shall be used by the Navy to calibrate reference accelerometers and K9155-D31 series secondary vibration systems. The PVCS shall be used to ensure secondary systems conform to the applicable sections of International Organization for Standardization (ISO) 16063- 21, Vibration by Comparison to a Reference Transducer. The PVCS shall follow methods and guidelines as specified by applicable sections of International Organization for Standardization (ISO) 16063-11 Primary Vibration Calibration by Laser Interferometry.

The second part will be the technical documentation of CSS compliance. 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 PVCS. It should be a primary system capable of directly measuring the displacement and frequency of the shaker using laser interferometry. 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 PVCS shall conform to Class 4 requirements in accordance with MIL- PRF-28800 for Navy shore-based laboratory use as specified in this CSS. It is expected that the system will operate only in laboratories that meet the highest of Navy environmental requirements.

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 PVCS and drawer space required for the storage of all accessories delivered with the PVCS.

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-28800G - Test Equipment for use with Electrical and Electronic Equipment, General Specification for.

MIL-PRF-12830B Performance Specification: Optical components For Fire Control Instruments;

General Specification Governing The Manufacture, Assemble, And Inspection

(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

ANSI-Z136.1 - Safe Use of Lasers

(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-16063-11 - Methods for the calibration of vibration and shock transducers Primary Vibration Calibration by Laser Interferometry

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.

3.1.1 Any equipment that uses lasers shall meet at a minimum Class 2 specification as defined in the ANSI Z136.1 standard for safe use of lasers. Operation of the PVCS shall not subject the operator to prolonged eye contact with a laser beam that cannot be mitigated by blinking or averting their eyesight. Normal operation and routine servicing of the PVCS shall not require disassembly of the laser module or removal of its power supply.

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.

3.2.3.3 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 12 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 PVCS 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. The LRU is defined as any component that the primary manufacturer has assembled in house and expects to sell to the Navy as long as they are in business.

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 PVCS 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 (±10%).

b. The nominal frequencies shall be single phase 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:

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.

THIS UNIT CONTAINS LITHIUM BATTERIES

Battery Manufacturer:

Battery Part Number:

THIS UNIT CONTAINS MERCURY BATTERIES

Battery Manufacturer:

Battery Part Number:

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 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

3.6.1.2 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 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.

3.7 Environmental requirements. The PVCS 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 PVCS shall comply with the specified performance requirements after a 3 0 -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 PVCS shall conform to the specified performance and accuracy requirements after being stored in a dry condition at temperatures ranging from -10 ºC to 50 ºC.

3.7.2.2 Temperature operating. The PVCS 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 PVCS shall conform to the specified performance and accuracy for conditions where the relative humidity is 20 to 60 percent.

3.7.3 Particle Count. The PVCS laser system shall conform to the specified performance and accuracy for conditions where particle count is held below 4 x 105 for particles larger than 1 µm per cubic meter of room volume and below 2 x 106 for particles larger than 0.5 µm per cubic meter. No particles larger than 50 µm.

3.7.4 Acoustic noise. The PVCS 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 PVCS. 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 10 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

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, +/- 0.5% magnitude and 0.7° phase o For 100 Hz &160 Hz, +/- 0.3% and 1.0° phase o For 10 Hz to 1000 Hz, +/- 0.3% and 1.5° phase o For 1000 Hz to 5 kHz, +/- 0.5% and 1.5° phase o For 5 kHz to 10 kHz, +/- 1.0% and 1.5° phase o For 10 kHz to <20 kHz +/- 2.5% and 3.0° phase

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).

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 Laser Primary Vibration Calibration of reference transducer and any other standards used to calibrate the SCVS shall provide 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 ISO16031-21 and NIST Technical Note 1297 along with the other uncertainty components as listed below The measurement uncertainty shall be given following the procedures in the ISO/IEC Guide to Uncertainty in Measurement (GUM).

o Effect of calibration less than reference amplitude o Base Strain Sensitivity of Reference sensor and primary laser system o Nonlinearity of Reference Sensor and primary laser system o Reference signal-to-noise effects o Mounting Surface Perpendicularity to axis of motion o Primary Laser system and 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 o Frequency measurement o Resolution

3.8.6 System Guard Banding. It is understood that the science of accelerometer calibration prevent high test uncertainty ratios. The system shall allow the operator to set guard band limits on the calibration workload to ensure that each system meets a PFA (probability of False Acceptance) under 2% and PFR (Probability of False Rejection) under 15%.

3.8.7 The system shall have an accelerometer sensitivity of 0.094% over the frequency range of 2 Hz to 20 Khz.

3.8.8 The PVCS displacement/stroke (peak to peak) shall be able to deliver up to a minimal of 0.1 g rms acceleration at the lowest required frequency of 2 Hz.

3.8.9 The PVCS shall be capable of handling DUT weights to 100 grams at a maximum acceleration and frequency of 10 g and 20,000 Hz, respectively.

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

3.8.11 Provides amplitude linearity verification check from 0.1 g to 10 g at the DUT’s (listed in Table 2) reference frequency. The system shall be able to show an amplitude linearity of 0.025%.

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

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

3.8.12.2 RMS amplitude range: 1mV to 3 V

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

3.8.13.1 Input for charge and voltage, IEPE (Integral Electronic Piezoelectric

Accelerometer)

3.8.13.2 Frequency range DC to 30 kHz

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

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

3.8.14 Support multiples sensors types: high impedance/charge mode accelerometer, low impedance accelerometers with constant current supply, electromagnetic velocity transducer, piezoresistive, integrated electronics piezoelectric accelerometer (IEPE). Table 2 represents the anticipated workload for the PVCS.

3.9 Calibration Requirement.

3.9.1 Calibration of individual test, measurement and diagnostic equipment (TMDE) that makes up the PVCS shall be accomplished by interlab comparison to external laboratories and their standards. For intrinsic standards, the PVCS shall report parameters for comparison to similar performance systems with traceable to an international standards organization, such as NIST. Subcomponents such as the charge amplifier, or signal conditioner, shall be capable of individual unit calibration. Assessment of health of TMDE will be conducted with standards traceable to NIST. The system should include all cables, connections and support equipment to connect to NIST Traceable TMDE.

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 PVCS 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 PVCS back to its ideal theoretical operational condition within certain defined limits, e.g. corrections shall not cover for a defective PVCS.

3.9.4 Since this is a primary system, all peculiar calibration fixtures and accessories needed for full self-calibration of the PVCS, such as plug-in extension boards, cables, special adapters, and special tools, shall be furnished with each unit delivered. The manufacturer may provide this as an add-on kit that can support multiple units.

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

3.9.6 The company shall provide the uncertainty value for all the electronics and equipment besides the laser interferometer used to calibrate the PVCS.

3.9.7 The calibrations of the PVCS subcomponents 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: 120V @ 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, or equivalent, or more modern system. The calibration software may also run on a virtual machine interface. The calibration software should be intuitive and allow a competent artisan to operate the system with 1 week of training or less.

3.10.4 Calibration Interval: The PVCS shall be able to meet and maintain all performance specification as indicated for a minimum of six months. Since Calibration is performed by interlab comparison, it shall not show significant drift from compared values within that 6-month period.

3.10.5 All operations of the PVCS shall be performed using controller commands or front panel controls on associated test equipment, except for 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 as read laser interferometer transducer signal output on a displayed screen. Software shall provide warning on signal deviation (e.g phase, amplitude) between DUT and laser signal 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 laser system. 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 laser interferometer 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 PVCS software shall have mechanism to prohibit the shaker from exceeding the vibration limits of the given shaker and amplifier.

3.10.14 Time to calibrate. The system shall be capable of performing complete calibration of a high accuracy accelerometer within 4 hours including warm up.

3.10.15 Accelerometer mount reflectivity. The accelerometer mount shall be of a high reflectivity material to allow the interferometer to function. The reflectivity shall comply with MIL-PRF-12830B Appendix B. Section 3.5 and shall have a reflectance equal to or greater than 80% luminous reflectance. A clear space to adhere a reflective material may also be used.

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 PVCS. Contractor shall refer to Table 2 for the requirements listed in item 3.11.2 to 3.11.7 during calibration.

3.11.6 The contractor shall supply together with the PVCS 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 PVCS.

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 contain 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 PVCS 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 PVCS.

3.11.13 The process of using the rubber bands/flexure to adjust and balance the armature shall not exceed 15 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

-hours (PEL- TWA) shall not be exceeded. The 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 The system shall be equipped with mechanical isolation to prevent ambient noise or noise generated by the system from degrading its performance.

3.11.16 The system shall be provided with all necessary physical isolation mounts, additional mass and decoupling to ensure laser interferometer can meet the required accuracies listed in section 3.8.

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 As an intrinsic standard, the system should be capable of ensuring the accuracy and precision of all measurements through interlab comparison. All peculiar support fixtures and accessories needed for system diagnostic and verification of the PVCS and data sharing with inter laboratory network, such as plug-in extension boards and special tools shall be furnished with each unit delivered.

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. The system shall be printer agnostic and will allow multiple printers from multiple vendors to self load onto the system.

3.12.3 Requires an Intel Core i5 of standard power, 9th generation or newer desktop processor or otherwise equivalent or better.

3.12.4 Requires a minimum of 16 GB RAM system memory or better.

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 or USB 4.0 compliant ports.

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

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 and may include slots for SD cards or micro SD.

3.12.11 At a minimum graphic card driven by 3GB GDDR5 that supports Windows Display Driver (WDDM 2.0 Note). This requirement may be waived if the contractor can provide documentation that both Windows and the Calibration software can nominally function on the integrated graphics card that they are proposing.

3.12.12 All software must run under Microsoft Windows 10 Professional as a non-elevated or admin user. This requirement may be met with a VM instances installed on a core operating system.

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 or provided directly by the primary manufacturer or primary contractor.

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 Interferometer. The interferometer type shall be of a Twyman-Green design or equivalent modified Michelson type design utilizing a frequency stabilized helium-neon laser as the light source.

3.15 High Coherence Light Source. The light source for the interferometer shall be at minimum two monochromatic wavelengths provided by frequency stabilized Helium-Neon lasers. The internal mirror He-Ne tubes shall be ‘hard sealed’. The lasers shall be coupled to the interferometer through fiber-optic cabling to isolate heat sources from the measurement chamber.

Laser short-term stability Fringe estimation Flatness and parallelism Phase-change Drift of laser and environmental sensors Calibration of laser and environmental sensors

3.16 Transit Case. The PVCS shall be provided transit cases for each He-Ne laser module. Each transit case shall be a pelican style outer casing with inner cushioning material for reduction of shock, vibration, concentrated forces, and abrasion during handling and shipment. The laser modules shall be form fitted to the interior cushioning without the need for any dunnage material.

3.17 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 non-proprietary 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. Note, maintenance access and repair does not include high technology items such as the laser system or data acquisition card circuit board. These items are exempt from the normal maintenance access requirement.

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 PVCS software file or firmware. Any calibration data entered shall be stored in memory for future recall, display, and printing via the digital interface.

3.18 Calibration. For the purpose of this CSS, calibration refers to the process of comparing a test instrument subcomponent with a calibration standard to determine the indicated error at specified test points. It may also mean the processing of comparing test points from intrinsic standards such as wavelength and frequency for a known collimated light source to the test instrument. Alignment refers to the process of characterizing and adjusting a test instrument to cause it to indicate within its specified accuracy.

1. Intrinsic Standards. For all items that derive their source data from intrinsic properties, the PVCS shall be able to use interlab comparison methods to validate the necessary minimum performance requirements to satisfy the needs of this CSS. The technical information and actions, including software, necessary to calibrate the PVCS shall be provided so that the calibration and interlab comparison can be performed by the Navy.

2. Calibration standards. For all calibrated items used to support the PVCS intrinsic laser system, the PVCS 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 PVCS shall be provided so that the calibration can be performed by the Navy.

3. 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.

3.19 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.

3.20 Laser Reliability. The laser light source can be considered an expendable and replaceable item. It is expected to function without drift for 10 years before replacement.

3.21 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.