CSS 21-3167 R1.pdf

CALIBRATION STANDARDS SPECIFICATION

PROCUREMENT PACKAGE

NULL DETECTOR

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

CSS 21-3167

DISTRIBUTION STATEMENT A. APPROVED FOR PUBLIC RELEASE

26 JANUARY 2023

CALIBRATION STANDARDS SPECIFICATION

PROCUREMENT PACKAGE

NULL DETECTOR

Prepared by:

Norberto Ulloa

Project Engineer

Microwave/Electro-Optic Standards (MS 32)

Measurement Science Department

Naval Surface Warfare Center, Corona Division

P.O. Box 5000

Corona, CA 92878-5000

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

NULL DETECTOR CALIBRATION STANDARD SPECIFICATION CSS 21-2167

i

Table of Contents

1.0 SCOPE

1.1 General

1.2 Usage

1.3 Class

2.0 APPLICABLE DOCUMENTS

2.1 Reference documents

2.2 Order of Precedence

3.0 REQUIREMENTS

3.1 Safety

3.2 Interchangeability

3.3 Materials Restricted for Navy Use

3.4 Operator Adjustments:

3.5 Operator Controls and Indicators

3.6 Connectors, Electric:

3.7 Wiring, Internal:

3.8 Temperature and Humidity

3.9 Vibration

3.10 Bounce, Loose Cargo

3.11 Fungus Resistance

3.12 Bench Handling

3.13 Electrical Power Sources and Connections

3.14 Enclosure Physical Characteristics:

3.15 Warning Markings

3.16 Equipment identification

3.17 Item Unique Identification (IUID):

3.18 Environmental Requirements

3.19 Performance Requirements

3.20 Maintainability

3.21 Calibration

3.22 Calibration Interval

3.23 Reliability

3.24 Warranty Label

3.25 Operating and Service Manuals

3.26 Performance Verification Tests

3.27 Service Provider

DIGITAL NULL DETECTOR CALIBRATION STANDARD SPECIFICATION CSS 21-2167

1.0 SCOPE

1.1 General: This document specifies the minimum requirements for a null detector. This equipment shall be of commercial design. It is intended to be used by Navy personnel in shipboard and shore-based laboratories and for on-site, in-place calibration. The equipment will be used primarily on bench top applications to calibrate various test instruments such as voltage divider and test sets.

1.2 Usage: Equipment covered by this CSS is intended for use in testing equipment and systems in the worldwide controlled environments in which military equipment is operated. Equipment will also be subjected to conditions aboard land, sea, and air vehicles, both military and commercial, during periods of transportation and storage. The requirements of this CSS are tailored to the intended use of the equipment. Specific requirements of MIL- PRF-28800G, as identified in this CSS, are invoked according to the class of equipment.

1.3 Class: The null detector shall conform to Class 4 requirements in accordance with MIL-PRF-28800G for Navy shipboard and shore-based laboratory use as specified in this CSS.

2.0 APPLICABLE DOCUMENTS

2.1 Reference documents: The following documents form a part of this CSS 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, STANDARDS, AND

HANDBOOKS

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

MIL-STD-130 - Standard Practice of Identification Marking of U.S. Military Property

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

INTERNATIONAL ELECTROTECHNICAL COMMISSION (IEC)

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.)

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 CSS shall take precedence.

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

3.0 REQUIREMENTS

3.1 Safety: The null detector shall comply with the safety requirements of IEC 61010-1. For safety, all accessible surfaces of the null detector shall be at ground potential. The power cable shall include a safety ground conductor.

3.2 Interchangeability: A model number shall be designated for all units provided.

All units and the replaceable assemblies, subassemblies, and parts comprising the units shall be interchangeable on a noninterference basis and shall cause no degradation of performance, unless alignment in-situ is required for the replaced components as part of the repair process and such alignment meets all maintainability requirements.

3.3 Materials Restricted for Navy Use: The materials and parts specified in a through g below shall not be used in equipment for the Navy except as specified herein.

a. Mercury, including mercury batteries

b. Radioactive material

c. Lithium batteries except for AA cell size or button type batteries

d. Organic materials prone to decay or promote growth of multi-celled organisms

e. Carcinogens, substances identified in the Occupational Safety And Health Act (OSHA) as cancer-producing substances

f. Flammable Materials

g. Explosive Materials

3.4 Operator Adjustments: The null detector shall include built-in adjustments or compensating devices for any function or parameter that would exceed the specified tolerance within the calibration interval defined in 3.22 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.

3.5 Operator Controls and Indicators: Operator controls and indicators designed to present change-of-state information to the operator or respond to change of http://www.iec.ch/ state conditions by the operator shall be readily accessible to the operator from the front of the null detector. Any readings presented on the controls and indicators shall be available to the operator without conversion or calculation.

3.6 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.

3.7 Wiring, Internal: Internal wiring practices shall be such that the wiring shall not be damaged during normal maintenance and calibration, if access to internal components is required.

3.8 Temperature and Humidity: The null detector shall meet the conditions below:

Temperature (Celsius)

Relative Humidity

Operating 10 to 35 5 to 95

Operating 0 to 50 5 to 75

Non-Operating -40 to 60 Not Applicable

3.9 Vibration: The null detector shall meet the random vibration requirements of MIL-PRF-28800G paragraph 4.5.5.3.1.

3.10 Bounce, Loose Cargo: The null detector shall conform to the specified performance and accuracy requirements after being tested in accordance with MIL-PRF-28800G paragraph 4.5.5.3.3. In the case of the null detector, the loose cargo bounce test is executed in the Vertical linear mode (straight up and down in vertical plane).

3.11 Fungus Resistance: The null detector shall not contain materials that provide nutrients for the growth of fungus as stated in paragraph 3.9.7 of document

MIL-PRF-28800G.

3.12 Bench Handling: The null detector shall conform to the specified performance and accuracy requirements and there shall be no damage to any controls, indicators, or fuseholders, after being tested in accordance with 4.5.5.4.3.

3.13 Electrical Power Sources and Connections:

3.13.1 Nominal and Alternate Power Source: The null detector shall operate at:

a. 120 Vrms

b. Single-phase 50 Hz and 60 Hz

c. Internal chargeable batteries providing at least 40 hours operation from a full charge.

d. Internal batteries trickle charged while instrument operates from line power.

3.13.2 Interruption of Power Source: Voltage interruptions shall not cause damage to the null detector. A power source interruption is when the voltage falls in the range of 0 to 70% of nominal. Null detector performance is not required during interruption of the power source. After power interruptions of any duration, the null detector shall automatically resume operation at either the last operating condition before interruption, or a default power-up condition.

3.13.3 Input Power Cable: The input power cable shall be a detachable power cable normally provided by the manufacturer.

3.13.4 Excessive Current Drain Protection: An automated safety mechanism (circuit breaker/fuse) shall be incorporated to automatically disconnect the null detector in the event of current being drawn that is in excess of the null detector rating.

3.14 Enclosure Physical Characteristics: The physical characteristics of the null detector equipment enclosure shall be in accordance with MIL-PRF-28800G paragraph 3.7 with the deviations specified in paragraphs 3.14.1 through

3.14.4 below.

3.14.1 Weight: The maximum weight of the null detector shall not exceed 10.25 pounds (4.65 kg).

3.14.2 Stacking Provisions: The null detector enclosure shall have a geometric configuration that permits stacking without harm to the enclosure or its contents.

3.14.3 Mechanical Stability: The null detector shall be designed for benchtop use to preclude tipping during normal handling and operation.

3.14.4 Front Cover: The enclosure shall include a front cover that can be stably mounted to protect the front panel when the null detector is not in operation.

3.15 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 null detector, and located as close as possible to the point of danger.

3.16 Equipment identification: An identification plate shall be affixed to the equipment and shall include those items specified in a through d below:

a. Manufacturer name

b. Equipment model number with installed options

c. Equipment nomenclature

d. Serial number

3.17 Item Unique Identification (IUID): DFARS clause 252-211.7003 is invoked. A two dimensional Item Unique Identification (IUID) data matrix conforming to MIL-STD-130 shall be included on the identification plate.

3.18 Environmental Requirements:

3.18.1 Temperature Not Operating: The null detector shall conform to the specified performance and accuracy requirements after being stored at temperature ranging from -20 ºC to 60 ºC.

3.18.2 Temperature Operating: The null detector shall conform to the specified performance and accuracy while operating in temperature ranging from 15 ºC to 30 ºC.

3.18.3 Humidity: The null detector shall conform to the specified performance and accuracy in the condition where the relative humidity is 20% to 50%.

3.19 Performance Requirements:

3.19.1 Input Channels: The null detector shall have at least one set of input terminations, including guard. The input shall be mounted on the front panel to receive input signals with the following characteristics:

a. Input voltage: 1 µV to 1000 Vdc

b. Connector Type. Low thermal EMF binding post terminals.

c. Input Impedance. The input impedance shall be 100 MΩ on 300 mV range and above, 10 MΩ on 100 mV range and below.

3.19.2 Display Requirements: The display shall have the following features:

a. Input Resistance:

100 MΩ on 300 mV range and above

10 MΩ on 100 mV range and below

b. Analog meter: The null detector analog meter shall be a mirror scale calibrated 10-0-10 and 3-0-3. The meter accuracy shall be ± (2% of selected range +

0.1 µV) (1.0 µV to 1000.0 V).

c. Maximum Noise: The meter noise (input shorted) shall be as follow:

Range Noise (peak-to-peak)

1.0 µV 0.20 µV

3.0 µV 0.25 µV

10.0 µV – 1000 V 0.30 µV

d. Analog meter response time: The meter response time to 90% of reading shall be as follow:

Range Time

1.0 µV 5 seconds

3.0 µV 3 seconds

10.0 µV – 1000 V 1.5 seconds

3.19.3 Range Selection: The null detector shall have a range selection knob mounted on the front panel. The range shall be selectable from 1.0 µV to 1000.0 V.

The selected ranged shall be visible on the front panel.

3.19.4 Isolated or Recorder Output: The null detector shall have an output yielding ±1.0 V for full scale deflection. The output accuracy shall be ± 0.5% of full scale range selected. Source impedance, 5 to 7.5 kΩ. Response time is approximately half that of the meter, therefore noise may exceed meter noise by 6 dB.

3.19.5 Series Mode Rejection: The null detector shall meet the following:

DC Common Mode:

Better than 160 dB, input short-circuit 80% relative humidity.

Better than 140 dB, input open-circuit 50% relative humidity.

Better than 120 dB, input open-circuit 80% relative humidity.

AC Common Mode (below 100 kHz):

100 Vrms or 120 dB greater than end scale, whichever is less, will effect reading less than 2% of end scale (Input open- circuit).

AC Normal Mode (60 Hz and above):

AC voltage 60 dB above end scale will effect reading less than 2% of end scale. Maximum AC voltage may not exceed 750 Vrms.

3.19.6 Input Isolation: The null detector input isolation shall be better than 1012 ohms at less than 50% relative humidity and 25º C (regardless of line, chassis or recorder grounding). The null detector input isolation shall be better than 1010 ohms up to 80% relative humidity and 35º C. The null detector drive guard, isolation improves by at least one order of magnitude up to 1013 Ohms. The null detector input terminal may be floated 1100 V off chassis ground.

3.19.7 Overload Protection: The null detector shall provide overload protection up to

1100.0 VDC on any range.

3.19.8 Zeroing: The null detector shall provide zeroing capability. The user shall be able to select the desire range or impedance to zero. Zero control range shall provide a ±5 µV minimum.

3.19.9 Stability of Zero: The null detector shall provide a better than 0.15 µV/hr and a

0.3 µV/day.

3.19.10 Temperature Coefficient of Zero: The null detector shall have a less than

0.1 µV/ºC from 15ºC to 35ºC, less than 0.2 µV/ºC from 0ºC to 20ºC.

3.19.11 Overload Protection: The null detector shall have a protection of up to 1100 Vdc may be applied on any range with a recovery time of 4 seconds (typical).

3.20 Maintainability:

3.20.1 Fault Isolation: The design of the null detector shall permit isolation of faults.

3.20.2 Preventive Maintenance: Preventive maintenance shall not require more than 15 minutes per a 30-day period. Preventive maintenance shall not require breaking of the null detector seams where calibration seals would normally be placed.

3.20.3 Maintenance Provisions: Equipment shall be as specified in a through d to facilitate maintenance:

a. Accessibility for Maintenance: The null detector shall be designed to ensure that any necessary maintenance access can be accomplished utilizing ordinary tools. The null detector 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 (performance verification and adjustment/alignment).

b. Maintenance and Calibration Aids: If required, circuit board extenders, special adapters, special tools, and patch or interface cables required for maintenance or calibration shall be provided with each null detector. They shall be identified as a set with a unique part number. Stowage shall be in a reusable pouch or container.

c. Accessibility for Repair: The null detector shall be designed so that Shop Repairable Assemblies (SRAs) can be removed without removing other hardwired subassemblies or components. There shall be no need to unsolder cables or interconnecting wiring to remove SRAs. Assemblies designed primarily to distribute power and signals to other components are excluded from this requirement. When troubleshooting/repair information is provided and access to both sides of SRAs is necessary, the design of the null detector shall facilitate this directly or through extender cards.

d. Adjustment/Alignment: The null detector shall be provided with any necessary instructions/software (to include programming commands, if not explicitly company proprietary and non-releasable to the Navy or any other commercial customer) needed to adjust/align the null detector so that the null detector meets its performance specifications after repair or due to the null detector failing performance verification.

1. Accessibility for Adjustment: The null detector design shall permit adjustments of components that are changeable without removing any component, printed circuit cards, or subassembly. The use of extender cards is permitted. (Example: Access will be provided to potentiometers that control the accuracy of specified parameters.)

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

i. This alignment information provided shall include any necessary software (preferably software commands) usable via any allowable communications interface specified in this document, e.g. IEEE-488 data bus, and usage instructions required to perform an alignment (to include any necessary setup instructions/software commands to put the null detector into the alignment mode, instructions/software commands necessary to gather new alignment data, along with any software algorithms required to format the alignment data into the appropriate data required by the null detector, and any instructions/software commands necessary to reprogram the null detector with the new alignment data).

ii. If the alignment software operates with external calibration standards, it shall be able to use existing Navy calibration standards that meet all necessary minimum performance requirements to satisfy a traceable calibration without modification. Otherwise, the manufacturer shall supply the explicit instructions/software commands and any necessary algorithms for the Navy to develop its own organic alignment support using existing Navy calibration standards.

3.20.4 Firmware Updates: The null detector shall be designed to allow for the Navy to update the null detector firmware. For the length of the contract and any subsequent warranty period beyond the length of the contract, the manufacturer shall provide to the Navy notification of any firmware updates, instructions on how to perform the update, and free access via appropriate media transfer method supported by the Navy (e.g. CD-ROM/DVD, Website, email) to firmware updates that fix bugs relating to any of the performance requirements cited in this CSS. For the same time period, the manufacturer shall provide to the Navy notification of any improvements relating to any performance requirements cited in this CSS. The firmware update process shall use any common interface path supported by the Navy (e.g. the USB or CD-ROM/DVD drive available with the device).

3.21 Calibration: The null detector shall meet the calibration requirements as specified below in 3.21.1 Calibration Certificate through 3.21.2 Calibration Procedure. 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 the test instrument to indicate within its specified accuracy limits.

3.21.1 Calibration Certificate: The null detector provided under this CSS shall have a current calibration certificate, with a calibration data sheet, traceable to the National Institute of Standards and Technology (NIST).

3.21.2 Calibration Procedure: A calibration procedure in accordance with best commercial practices shall be provided.

3.22 Calibration Interval: Calibration interval requirements shall be in accordance with MIL-PRF 28800G paragraph 3.13. The manufacturer shall substantiate the calibration interval by providing technical justification data. The calibration interval of the null detector shall ensure a minimum of 85% of the instruments remain in tolerance at the end of this interval.

3.23 Reliability: The null detector shall meet the reliability requirements of MIL- PRF-28800G paragraph 3.14. The contractor/manufacturer shall provide a summary of maintenance or warranty records to establish the validity of the statistical assertion. If records of the actual null detector 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-64 used to provide substitute records.

3.24 Warranty Label: The null detector shall have a warranty label that reflects the start and end dates of the warranty. Warranty shall be a minimum of one (1) year.

3.25 Operating and Service Manuals: The manufacturer shall provide an electronic copy (PDF format on CD-ROM) of test equipment manuals; covering general information, installation, electrical specifications, operation, calibration, maintenance, service, storage, physical characteristics, and environmental requirements. The Government reserves the right to reproduce any portion of the manual(s), including any copyrighted material contained within for government use only.

3.26 Performance Verification Tests: The manual(s) shall provide support documentation and step by step instructions for the performance verification tests; including required test equipment and applicable specifications, setup configurations, test points and tolerances.

3.26.1 Adjustment Procedures: The manufacturer shall support automated adjustment procedures of TI using external test equipment. Detailed instructions, setup diagrams, and a list of required test equipment shall be provided.

3.26.2 Maintenance: The manual(s) shall include a maintenance section addressing the philosophy regarding modular component level (circuit card/sub-assembly) repair strategies. Instructions and documents shall be provided for troubleshooting, fault isolation, inspection and cleaning, disassembly and reassembly instructions, assembly drawings and diagrams for modular and sub-assemblies, recommended repair components, and any other preventative or corrective maintenance.

3.27 Service Provider: The manufacturer calibration and repair support facilities shall be located within the continental United States.