Attachment 02_Primary Lab Wattmeter Calibration System CSS 01-3246.pdf

CSS 01-3246

CALIBRATION STANDARDS SPECIFICATION

PROCUREMENT PACKAGE

PRIMARY LAB WATTMETER CALIBRATION SYSTEM

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

15 JULY 2025

CALIBRATION STANDARDS SPECIFICATION

PROCUREMENT PACKAGE

PRIMARY LAB WATTMETER CALIBRATION

SYSTEM

Prepared by:

Ignacio Espinosa

Microwave/Electro-Optic Standards (MS 32) Measurement Science Department

Naval Surface Warfare Center, Corona Division Corona, CA 91718-5000

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

PLWCS CALIBRATION STANDARD SPECIFICATION CSS 01-3246

i

Table of Contents

1 SCOPE

1.1 Classification

2 APPLICABLE DOCUMENTS

2.1 Reference documents

2.2 Order of precedence

3 REQUIREMENTS

3.1 Safety

3.2 Interchangeability

3.3 Design and construction

3.3.1 Operator adjustments and controls

3.3.1.1 Operator adjustments

3.3.1.2 Operator controls

3.3.2 Connectors, electric

3.3.3 Wiring, internal

3.3.4 Internal cooling

3.3.4.1 Cooling devices

3.3.5 Self-test capability

3.4 Digital interface

3.4.1 Digital interface requirements

3.5 Electrical power sources and connections

3.5.1 Electrical power source

3.5.1.1 Nominal and alternate power source

3.5.1.1.1 Interruption of power source

3.5.1.1.2 Battery restrictions

3.5.2 Electrical power connections

3.5.2.1 Input power cable

3.5.2.2 Input power switch

3.5.2.3 Excessive current drain protection

3.5.2.4 Indicators

3.6 Enclosure physical characteristics

3.6.1 Dimensions

3.6.2 Weight

3.6.3 Enclosure requirements

3.6.3.1 Enclosures, console cabinet

3.6.3.2 Work surfaces, console cabinet

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3.7 Marking and identification

3.7.1 Marking

3.7.1.1 Warning markings

3.7.1.2 Panel markings and processes

3.7.2 Equipment identification

3.8 Environmental requirements

3.8.1 Warm-up

3.8.2 Temperature and humidity

3.8.3 Acoustic noise

3.9 Performance requirements

3.9.1 Wattmeter Calibration

3.9.2 Transfer Standard Calibration

3.9.2.1 Transfer Standard Calibration Points

3.9.3 Calorimeter Calibration

3.9.3.1 AC Reference Standard

3.9.3.2 DC or AC power supply

3.9.3.3 Vector network analyzer (VNA)

3.9.4 PLWCS Precision RF Power and Frequency Outputs

3.9.4.1 Output Control

3.9.4.2 Frequency Range

3.9.4.3 Frequency Accuracy

3.9.4.4 Frequency Resolution

3.9.4.5 Harmonics, Non-harmonics, and Sub-harmonics

3.9.4.6 Power Output Range and Accuracy

3.9.4.7 Power Resolution/ Adjustability

3.9.4.8 Stability (drift)

3.9.4.9 Power Display Resolution/Units

3.9.5 Connector output

3.9.6 PLWCS components

3.9.6.1 Impedance

3.9.6.2 High Power RF Load

3.9.6.3 RF Cable

3.9.6.4 Lab Jacks

3.9.6.5 Low and high power transfer standard

3.9.6.5.1 Low Power Transfer Standard

3.9.6.5.1.1 Input Power

3.9.6.5.1.2 Power Measurement Range

3.9.6.5.1.3 Connector input/output

3.9.6.5.1.4 Impedance

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3.9.6.5.1.5 Power Display Resolution/Units

3.9.5.5.1.7 Dimensions

3.9.5.5.1.8 Weight

3.9.6.5.2 High Power Transfer Standard

3.9.6.5.2.1 Input Power

3.9.6.5.2.2 Power Measurement Range

3.9.6.5.2.3 Connector input/output…

3.9.6.5.2.4 Impedance

3.9.6.5.2.5 Power Display Resolution/Units

3.9.5.5.2.7 Dimensions

3.9.5.5.2.8 Weight

3.9.6.5.3 Transit Case

3.9.6.5.3.1 Transit case cover

3.9.6.5.3.2 Transit case stacking provisions

3.9.6.5.3.3 Transit case handles

3.9.6.5.3.3.1 Hard transit case handles

3.9.6.5.3.4 Transit case accessory stowage

3.9.6.5.3.5 Transit case corners

3.9.6.5.3.6 Transit case insert

3.9.6.5.3.7 Transit case identification plate

3.10 Maintainability/Usability

3.10.1 Fault isolation

3.10.2 Preventive maintenance

3.10.3 Calibration

3.10.3.1 Calibration Test Process

3.10.3.2 Access for Calibration

3.10.4 Maintenance provisions

3.11 Workmanship

3.12 Wattmeter Workload

3.13 Wattmeter workload test point support

NOTE:

For 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 limits.

1 SCOPE

General. This document specifies the minimum requirements for a Primary Lab Wattmeter Calibration System (PLWCS). For the purpose of this calibration standards specification (CSS), the Primary Lab Wattmeter Calibration System shall be referred to as the PLWCS. This PLWCS may be of commercial design.

It is intended to be used by Navy personnel in primary-based laboratories. The PLWCS includes a wattmeter calibration system (WCS) used to calibrate and align both analog and digital radio frequency (RF) 50 ohm impedance thru line wattmeters workload. The PLWCS shall be non-portable and be capable of generating up to 1050 watts at 2 to 400 MHz, and up to 105 watts at 2 to 1000 MHz. Among other PLWCS components, the PLWCS system shall include a low and high modular (removable from the PLWCS) coaxial thru line RF power standard, herein referred to as the low and high power transfer standard. The PLWCS shall also include a high power RF calorimeter system that will be used to calibrate its transfer standard(s). The RF calorimeter system shall be traceable to the National Institute of Standards and Technology (NIST) or the International Systems of Units (SI) using the AC substitution approach. Detailed performance requirements are provided in this document. The PLWCS shall include all necessary components and accessories required to calibrate its RF calorimeter system, its transfer standards, and RF 50 ohm impedance thru line wattmeters.

1.1 Classification. The PLWCS shall conform to Class 4 requirements in accordance with MIL-PRF-28800G for Navy primary-based laboratory use as specified in this

CSS.

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

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

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

IEEE 802.3 Standard - IEEE Standard for Ethernet (Std 802.3TM-2022)

(Copies of IEEE documents are available online at https://ieeexplore.ieee.org)

INTERNATIONAL ELECTROTECHNICAL COMMISSION (IEC)

IEC/IEEE 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.)

LAN EXTENSIONS FOR INSTRUMENTATION (LXI) CONSORTIUM

LXI Device Specification - LAN Extensions for Instrumentation (LXI) (Revision 1.6-2022) Device Specification

(Copies of LXI documents are available online at http://www.lxistandard.org or LXI Consortium, PO Box 1016, Niwot, CO 80544-1016.)

STANDARD COMMANDS FOR PROGRAMMABLE INSTRUMENTS (SCPI)

CONSORTIUM

SCPI Volume I -1999 - Standard Commands for Programmable Instruments (SCPI)

(Copies of SCPI documents are available online at http://www.ivifoundation.org or IVI http://www.iec.ch/ http://www.lxistandard.org/ http://www.ivifoundation.org/

Foundation Corporate Office, PO Box 1016, Niwot, CO 80544-1016.)

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

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

(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)

DOCUMENT MANAGEMENT

ISO/IEC 32000-1:2008 - Portable Document Format (PDF)

(Copies of ISO/IEC 32000-1:2008 are available at: https://www.iso.org/standard/51502.html)

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. The power cable shall include a safety ground conductor. This is also true of drawer assemblies; disconnecting the safety ground shall also disconnect the power conductors. A safety feature shall be included that will limit the power output to no more than 1050 Watts (60.211 dBm) at the power output port.

3.2 Interchangeability. A model number shall be designated for all units provided. All units and all user replaceable assemblies, subassemblies, components, and parts of a designated model provided shall be fully interchangeable without interference or degradation of performance.

http://www.iso.org/iso/home.html http://www.iso.org/standard/51502.html)

3.3 Design and construction. The test equipment shall be designed and constructed to permit compliance with all applicable requirements of class 4, as defined in this CSS and MIL-PRF-28800G.

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 manufacturer defined 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 from the front of the equipment. The readings presented on the controls and indicators shall be available to the operator without conversion or calculation.

3.3.2 Connectors, electric. Provisions 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 Self-test capability. The PLWCS shall perform an automatic diagnostic self-test at startup and shall indicate whether the PLWCS is functional or identify equipment malfunctions.

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 that conforms to IEC 60488-2:2004 /IEEE 488.2-1992; or an IEEE 802.3 Ethernet connection (using an RJ-45 connector) that conforms to either the 10/100/1000 Base-T communications sections of IEEE 802.3 Standard or the LAN Extensions for Instrumentation (LXI) Device Specification.

3.4.1 Digital interface requirements. The digital interface shall have the programmable capability to externally control the various PLWCS functions listed in the 3.9 Performance Requirement (and 3.10 Maintainability/Usability, as applicable) including all ranges, modes, levels, settings, measurement data, etc. Any commands used to access (read/write) the PLWCS function settings, measurement data, or calibration/alignment processes via the PLWCS shall to the fullest extent possible conform to the syntax, and requirements of programming commands described in the Standard Commands for Programmable Instruments (SCPI) reference. Any PLWCS functions (both read/write) that are involved in executing a measurement, establishing measurement settings, calibrating/aligning PLWCS, or transmission of measurement data shall be available through the PLWCS. The digital interface shall also provide the capability to internally control (read/write) external devices to the PLWCS. The hardware protocol and programming command sets shall be documented and provided via electronic media. An additional 4 USB digital interface ports conforming to the Universal Serial Bus Specification (USB) shall also be required from PLWCS for communicating with external devices. 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 sources and connections. The electrical power sources and connections shall be as specified below in 3.5.1 Electrical Power Sources through

3.5.2 Electrical Power Connections.

3.5.1 Electrical power source. The equipment shall operate from the input power conditions specified in 3.5.1.1 Nominal and alternate power source through

3.5.1.1.1 Interruption of power source. When multiple power source requirements are invoked, all selectable power setting controls shall be externally accessible, and the equipment shall operate within each required range without changing manually operated devices such as tapped transformers (variable setting transformers) and other similar devices for compensation.

3.5.1.1 Nominal and alternate power source. Operating power of the PLWCS can be any one of, or all of the following:

1) 108 to 132 Vrms, 50 and 60 Hz source, single phase, 30 Amps max (High power/special capability)

2) 187 to 264 Vrms, 50 and 60 Hz source, 3 phase, 30 Amps/phase (High power/special capability)

3) 108 to 132 Vrms, 50 and 60 Hz source, 1 phase, 20 Amps/phase

The vendor shall provide detailed information on the system electrical power requirements.

THIS UNIT CONTAINS LITHIUM BATTERIES

Battery Manufacturer:

Battery Part Number:

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 as specified in 3.5.1.1.2.1 Lithium batteries.

3.5.1.1.2.1 Lithium batteries. Commercial UL approved equipment that contains lithium batteries (size AA or button cell type) used for memory backup are approved for use under a general blanket approval waiver. Tadiran liquid cathode batteries, SO2 (sulfur dioxide) batteries or lithium vinyl chloride “liquid cathode” batteries are strictly prohibited. For the purpose of this specification, a lithium (size AA or button cell type) battery as described above is approved. The Equipment shall incorporate safety precautions. A label containing the following caution and information shall be affixed to the outside of the unit, as applicable:

3.5.2 Electrical power connections. The electrical power connections shall be as specified below in 3.5.2.1 Input power cable through 3.5.2.4 Indicators. When single-phase operation is specified, the equipment shall operate with a ground at the primary power source on either or neither side of the single phase input power line.

3.5.2.1 Input power cable. A 6 foot (1.8 m) minimum length, detachable power cable that can be connected or disconnected without disassembly or removal of adjacent components shall be provided by the vendor. When equipment is specified for operation from 120 Vrms and 240 Vrms power sources, separate 120 Vrms and 240 Vrms power cables shall be provided.

3.5.2.2 Input power switch. The operator shall be able to energize the equipment from the front panel. 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 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 Enclosure physical characteristics. The physical characteristics of the equipment shall be as specified in 3.6.1 Dimensions through 3.6.3.2 Work surfaces, console cabinet.

3.6.1 Dimensions. PLWCS maximum dimensions shall not exceed 84 inches in height, 164 inches in width, and 50 inches in depth.

3.6.2 Weight. The weight of the PLWCS including all covers and accessories shall not exceed 4,200 lbs [based on Navy calibration laboratory maximum floor occupancy load constraint of 125 lbs/ft2, and maximum occupancy space of 33.3 ft2 = 4,800 in2 (96 inches x 50 inches)].

3.6.3 Enclosure requirements. The PLWCS enclosure shall be as specified in 3.6.3.1 Enclosures, console cabinet through 3.6.3.2 Work surfaces, console cabinet.

3.6.3.1 Enclosures, console cabinet. The equipment shall be fitted with a console cabinet. The console cabinet enclosure shall provide protection for the contained equipment from the specified environmental conditions. Access to the interior of the enclosure shall be provided.

3.6.3.2 Work surfaces, console cabinet (MIL-PRF-28800G classification requirements not applicable). The equipment fitted with a console cabinet shall have a work surface provided by an attached benchtop. The work surface benchtop will be used to calibrate either wattmeter or transfer standards using the PLWCS.

Personnel work surfaces shall be constructed of nonconducting material. Any work surface that projects from the console cabinet shall not be damaged during or interfere with transport or shipping. Work surface benchtop dimensions can measure between 36 to 42 inches in height, measure 38 inches in depth, and measure 19 inches in width. The depth dimension of the work surface benchtop was determined based on a wattmeter with width dimensions of 12 inches and a high power RF load (see 3.9.5.2) with depth dimensions of 17.5 inches. If other width dimensions for the wattmeter and depth dimensions for the high power RF load are used other than the ones noted, the vendor shall add the wattmeter width and high power RF load depth delta inches difference to the overall depth dimensions of the requested work surface benchtop. Note that work surface dimensions were determined assuming the combination of wattmeter and high power RF load are greater than that of the transfer standard.

3.7 Marking and identification. Marking and identification of test equipment shall be as specified below in 3.7.1 Marking through 3.7.2 Equipment identification.

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

3.7.1.1 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.

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

3.7.2 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. Manufacture name

b. Equipment model number with installed options

c. Equipment nomenclature

d. Serial number

3.8 Environmental requirements. The PLWCS environmental performance requirements shall be as specified below in 3.8.1 Warm-up through 3.8.3 Acoustic noise. It shall conform to the specified performance when subjected to the environmental conditions of this specification.

3.8.1 Warm-up. The PLWCS shall comply with the specified performance requirements after a 30-minute warm-up period preceded by a 2-hour not operating temperature stabilization period.

3.8.2 Temperature and humidity. The temperature ranges and humidity limits for both operating and not operating conditions shall be as specified below.

Temperature (°C) Relative Humidity (%)

Operating 20 to 30 20 to 60

Non-Operating -40 to 70 Not Controlled

3.8.3 Acoustic noise. The PLWCS shall not generate acoustic noise in excess of 55 dBA sound pressure level (SPL) when measured at the operator and bystander positions, in accordance with ISO 7779.

3.9 Performance requirements. The PLWCS shall have the capability to calibrate wattmeters and have the capability to calibrate the transfer standards that are part of the PLWCS cited in 3.9.5.5. The PLWCS shall have a calorimeter system to provide measurement traceability to the SI or NIST and meet the performance accuracy requirements cited in 3.9.4.

3.9.1 Wattmeter Calibration. The PLWCS shall include all necessary components and accessories to automatically and semi-automatically generate, control, measure and record power measurements over the range and within the accuracies cited in 3.9.4 to calibrate the workload wattmeters cited in 3.13.

The PLWCS shall be capable of operating in both a semi-automated mode and a fully automatic mode. In both modes the PLWCS shall receive all necessary inputs from the operator, automatically generate power, settle at the test point(s), record and display test results. The semi-automated mode shall require the operator to input the wattmeter data at each test point and then command the PLWCS to proceed to the next test point.

3.9.2 Transfer Standard Calibration. The PLWCS shall include all necessary components and accessories to generate, control, measure, and record power measurements to automatically calibrate the low and high power transfer standards cited in 3.9.5.5. All components along the transmission path of the PLWCS shall provide 50 ohm TI matching impedance. The PLWCS must provide the needed performance capabilities to be able to calibrate the transfer standard(s) to performance specifications so that when the transfer standard (s) is re-connected to the PLWCS, the PLWCS will provide the performance specifications as cited in 3.9.4.1 Output Control thru 3.9.4.8 Stability (drift).

3.9.2.1 Transfer Standard Calibration Points. In order to minimize the transfer standard calibration time with the high power calorimeter, the transfer standards shall have the minimum amount of calibration points needed to provide the performance specifications cited in 3.9.4.1 Output Control thru 3.9.4.8 Stability (drift) for the calibration of wattmeters listed in paragraph 3.13 at the test points listed in paragraph 3.14.

3.9.3 Calorimeter Calibration. The PLWCS shall include all necessary components (see component items 3.9.3.1 through 3.9.3.3) and accessories to calibrate its calorimeter system. When the calorimeter calibrates the PLWCS transfer standard(s), and the transfer standard(s) is re-connected to the PLWCS, the PLWCS will provide the accuracies cited in paragraph 3.9.4.

3.9.3.1 AC Reference Standard. A quantity of three AC Reference Standards are required to serve as working and check standards. The AC Reference Standards shall require either a NIST or an OEM calibration.

3.9.3.2 DC or AC power supply. A quantity of one DC or AC power supply is required as a working standard to provide power to the calorimeter load.

3.9.3.3 Vector network analyzer (VNA). A quantity of one VNA is required to characterize the calorimeter load VSWR.

3.9.4 PLWCS Precision RF Power and Frequency Outputs

3.9.4.1 Output Control. The PLWCS shall have front panel manual control of all power output functions cited in 3.9.4.2 Frequency Range through 3.9.4.6 Power Output Range and Accuracy, and 3.9.4.7 Power Resolution/Adjustability.

3.9.4.2 Frequency Range. Power outputs cited in 3.9.4.6 shall be capable of being set as follows:

2 to 1000 MHz (0.95 to ≤105 W)

2 to 400 MHz (>105 to 1050 W)

3.9.4.3 Frequency Accuracy. The accuracy of the frequencies cited in 3.9.4.2 shall be as follows: ±0.001% of set value.

3.9.4.4 Frequency Resolution. The frequencies cited in 3.9.4.2 shall be adjustable to at least 1 kHz resolution.

3.9.4.5 Harmonics, Non-harmonics, and Sub-harmonics. Harmonics, non-harmonics, and sub-harmonics on output signals shall be kept to 50 dB below carrier frequencies cited in 3.9.4.2.

3.9.4.6 Power Output Range and Accuracy. The PLWCS shall be capable of selectable power outputs with the shown accuracy at the power output ports as follows:

Power 1 Range: 0.95 to ≤105 W (29.777 to ≤50.211 dBm), 2 to 1000 MHz Accuracy: ±1.50% of set value to be calibrated

Power 2 Range: >105 to 1050 W (>50.211 to 60.211 dBm), 2 to 400 MHz Accuracy: ±1.50% of set value to be calibrated

Default preset power level shall be set to 0.95 W. Default output state for power is off.

Power 1 output to Power 2 output shall be selectable.

The accuracy includes mismatch error between PLWCS and the PLWCS wattmeter workload [the effective SWR as seen by the PLWCS output connector is a combination of the PLWCS wattmeter workload input SWR (PLWCS wattmeter workload input VSWR is ≤1.05 for frequencies ≤400 MHz, and >1.05 to ≤1.15 for frequencies >400 to 1000 MHz) and the load SWR (PLWCS wattmeter workload output will be connected to a load)].

3.9.4.7 Power Resolution/Adjustability. The power outputs cited in 3.9.4.6 shall have at least 0.001 dB resolution and be adjustable in at least 0.01 dB increments (power level fine tune increment adjustment at the PLWCS power output connector).

3.9.4.8 Stability (drift). The power outputs cited in 3.9.4.6 shall not drift more than 0.015 dB within a 3 minute span after less than or equal to 120 minutes of settling.

The system software will monitor the process for a level of stability and determine when to proceed with set power in order to maintain the power accuracies as cited in 3.9.4.6.

3.9.4.9 Power Display Resolution/Units. The PLWCS shall display power values as cited in the ranges noted in 3.9.4.6 (only 0.95 to 1050 W) in both log and linear.

At least 5 significant digits of resolution shall be provided when power values are displayed in linear (e.g. 100 uW digit present when displaying a 1 W power level), and at least 0.001 dB resolution when power values are displayed in log (dBm).

3.9.4.10 Connector output. The PLWCS shall be able to calibrate the wattmeter workload with Type-N male or female connectors to the performance requirements as cited in 3.9.4.2 Frequency Range through 3.9.4.8 Stability (drift). To reduce the number of PLWCS output connectors, N-type barrel adapters (as needed male or female) can be used to connect to the PLWCS output connectors but shall meet all performance requirements at the other side of the connector.

To support the wattmeter workload that measure power using an analog display, and to minimize parallax error, output connectors of the PLWCS shall be placed in such a position to when connecting to the calibrating wattmeter, PLWCS output connectors are in line with the calibrating wattmeter’s display and input/output connectors. See the following figure for further description.

Additionally, due to the PLWCS having to support wattmeter’s measuring power using an analog display, the PLWCS power output control (via knob, softkey, hardkey, etc.) and output connectors shall be placed in such a position to where the technician can simultaneously manually adjust PLWCS power output while seeing and aligning the wattmeter display pointer to the wattmeter graticule line.

For ease of connecting the PLWCS to the wattmeter, all PLWCS output connectors are required to protrude ≥ 1 1/4 inches from the PLWCS interface panel and are also required to be positioned 6 to 8 inches above the work surface benchtop.

3.9.5 PLWCS components. The PLWCS shall consist of the following components:

3.9.5.1 Impedance. All PLWCS components along the transmission path shall provide a 50 ohm wattmeter matching impedance.

3.9.5.2 High Power RF Load. A high power RF load shall be provided with the PLWCS.

The high power RF load shall be external to the PLWCS and will be used when calibrating PLWCS wattmeter workload. The input of the high power RF load will be connected to the output of the PLWCS wattmeter workload [using a RF cable (3.9.5.3)], and shall provide the specification requirements as indicated below:

Frequency: 2 to 1000 MHz

SWR: ≤1.05:1

Power Rating: 1500 Watt CW Connector type: N-type female

Note that the PLWCS power output accuracy required in 3.9.4.6 is dependent on the high power load specifications noted above.

Wattmeter output connector

Wattmeter display

PLWCS output connector

Wattmeter input connector

PLWCS

3.9.5.3 RF Cable. A RF cable shall be provided with the PLWCS. The RF cable shall be external to the PLWCS and will be used when calibrating PLWCS wattmeter workload using the PLWCS. The RF cable will be used to connect the output of the PLWCS wattmeter workload to the input of the high power RF load (cited in 3.9.5.2). The RF cable shall be of N-type male connectors (both ends), and at a minimum will be 3 feet in length. Its performance specifications will be such that when connecting it between the high power RF load and the PLWCS wattmeter workload, and connecting the PLWCS wattmeter workload to the PLWCS, the PLWCS output connector will provide the power output range and accuracy as required in 3.9.4.6.

3.9.5.4 Lab Jacks. (MIL-PRF-28800G classification requirements not applicable). One medium and three large stainless steel lab jacks shall be provided with the PLWCS. Specifications requirements for the jacks are indicated below:

Medium Jack:

Surface Area: 6” x 6” (length x width)

Size: 3” to 9” (lift height)

Weight capacity: minimum of 15 lbs

Large Jacks:

Surface Area: 8” x 8” (length x width)

Size: 3.5” to 9” (lift height)

Weight capacity: minimum of 30 lbs

3.9.5.5 Low and high power transfer standard. The PLWCS shall consist of a low and high power modular (removable from the PLWCS) transfer standard. The PLWCS coaxial thru line RF power measurement system may be of any of the following configurations, and what is considered the low and high power transfer standard will vary depending on the configuration used.

Coaxial thru line RF power measurement system configuration #1: A directional coupler connected at its output coupling port to a RF power meter using a thermistor mount.

Coaxial thru line RF power measurement system configuration #2: A thru line RF power sensor connected to a RF power meter (each unit is individual from one to another).

Coaxial thru line RF power measurement system configuration #3: A thru line RF power sensor connected to a RF power meter (units are integrated and treated as one unit).

If the first configuration is used, either a directional coupler and thermistor mount or a RF power meter, directional coupler, and thermistor mount can be considered the transfer standard.

If the second configuration is used, either a thru line RF power sensor or RF power meter and RF power sensor can be considered the transfer standard.

If the third configuration is used, both the thru line RF power sensor and RF power meter are considered the transfer standard.

Performance requirements for the transfer standards shall be in accordance with sub-paragraphs 3.9.5.5.1 through 3.9.5.5.2 as mentioned below. Note that the output of the low and high power transfer standard is the output of the parent PLWCS, and when connected (along with the RF power meter, if applicable) shall provide all performance requirements as cited in 3.9.4 PLWCS Precision RF Power and Frequency Outputs.

It is acceptable to provide a single transfer standard to replace the low power and high power transfer standards, as long as all requirements as cited in sections 3.9.5.5.1 and 3.9.5.5.2 are met in the one transfer standard. It is also acceptable to provide more than one of each of the low and high power transfers, as long as all cited requirements cited in 3.9.5.5.1 and 3.9.5.5.2 are met.

3.9.5.5.1 Low Power Transfer Standard.

3.9.5.5.1.1 Input Power. Capable of handling power levels from 0.95 to ≤105 W (29.777 to ≤50.211 dBm), 2 to 1000 MHz

3.9.5.5.1.2 Power Measurement Range. When connected to its appropriate RF power meter, the transfer standard shall be able to measure throughout the following power/frequency range inputs:

0.95 to ≤105 W (2 to 1000 MHz)

3.9.5.5.1.3 Connector input/output. Input connector shall be Type-N female. Note that the transfer standard output connector is the output of the parent PLWCS, and when connected to the PLWCS, the transfer standard shall meet the connector requirement as cited in 3.9.4.10.

3.9.5.5.1.4 Impedance. The low transfer standard components shall be nominal 50 ohm impedance.

3.9.5.5.1.5 Power Display Resolution/Units. The transfer standard “RF meter” shall display power values as cited in the ranges cited in 3.9.5.5.1.2 in both log and linear. At least 5 significant digits of resolution shall be provided when power values are displayed in linear (e.g. 100 uW digit present when displaying a 1 W power level), and at least 0.001 dB resolution when power values are displayed in log (dBm).

3.9.5.5.1.6 Dimensions. The dimensions of the low power transfer standard dimensions shall not exceed 14 inches in depth, 19 inches in width, and 5.5 inches in height.

3.9.5.5.1.7 Weight. The weight of the low power transfer standard shall not exceed 15 lbs.

3.9.5.5.2 High Power Transfer Standard.

3.9.5.5.2.1 Input Power. Capable of handling power levels from >105 to 1050 W (>50.211 to 60.211 dBm), 2 to 400 MHz

3.9.5.5.2.2 Power Measurement Range. When connected to its appropriate RF power meter, the transfer standard shall be able to measure throughout the following power/frequency range inputs:

>105 to 1050 W (2 to 400 MHz)

3.9.5.5.2.3 Connector input/output. Input connector shall be Type-N female. Note that the transfer standard output connector is the output of the parent PLWCS, and when connected to the PLWCS, the transfer standard shall meet the connector requirement as cited in 3.9.4.10.

3.9.5.5.2.4 Impedance. The high transfer standard components shall be nominal 50 ohm impedance.

3.9.5.5.2.5 Power Display Resolution/Units. The transfer standard “RF meter” shall display power values as cited in the ranges cited in 3.9.5.5.2.2 in both log and linear. At least 5 significant digits of resolution shall be provided when power values are displayed in linear (e.g. 100 mW digit present when displaying a 1000 W power level), and at least 0.001 dB resolution when power values are displayed in log (dBm).

3.9.5.5.2.6 Dimensions. The dimensions of the high power transfer standard dimensions shall not exceed 14 inches in depth, 19 inches in width, and 5.5 inches in height.

3.9.5.5.2.7 Weight. The weight of the high power transfer standard shall not exceed 15 lbs.

3.9.5.5.3 Transit Case. A hard transit case shall be provided for each transfer standard to protect the transfer standard and accessories during shipment. The transit case is not an integral part of the test equipment. It need not provide for operational capability of the equipment when enclosed. The physical characteristics of the transit case shall be as specified herein.

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

3.9.5.5.3.2 Transit case stacking provisions. The transit case shall have a geometric configuration that permits stacking without harm to the enclosure or its contents. The maximum stacking height shall be 4 units.

3.9.5.5.3.3 Transit case handles. One or more handles shall be provided. The number and location of handles shall be such that the load distribution per handle shall not exceed 20 kg (44 lbs). Handles shall be located above the equipment center of gravity to ensure carrying stability.

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

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

3.9.5.5.3.5 Transit case corners. All hard-edged corners shall be designed to preclude injury to personnel or damage to material. All corners shall be adequately reinforced to protect the instrument from damage during shipping, handling and storage.

3.9.5.5.3.6 Transit case insert. A custom cut, high density, polyethylene black poly plank foam case insert shall be provided to organize and provide robust protection of the equipment while stored in the transit case.

3.9.5.5.3.7 Transit case identification plate. The equipment transit case shall include a permanently affixed identification plate that contains the following information:

• Nomenclature of the transfer standard

• Model or part number of the transfer standard

• CAGE of the transfer standard

An acceptable method of attachment is to use 1/8” diameter solid or semi-tubular rivets and backup washers.

3.10 Maintainability/Usability. Maintainability/Usability shall be as specified below in

3.10.1 Fault isolation through 3.10.4 Maintenance provisions.

3.10.1 Fault isolation. The design of the equipment shall permit isolation of faults, and repair down to the component item or lowest replaceable unit with the maintenance provisions furnished. Refer to MIL-PRF-28800G paragraph 6.6.17 Nonrepairable subassembly for a definition of a nonrepairable subassembly.

3.10.2 Preventive maintenance. Preventive maintenance shall not require more than 15 minutes per a 30-day period. Preventive maintenance shall not require breaking of the equipment seams where calibration seals would normally be placed.

3.10.3 Calibration. The PLWCS shall meet the calibration requirements as specified below.

3.10.3.1 Calibration Test Process. For periodic calibration of the PLWCS, a test process that does and does not require software (e.g., computer based calibration process) is desired for flexibility in operating environments (Alignment may require a software based approach to update EEPROMS or equivalent type circuits.). If needed, the calibration test process may encompass individual PLWCS component calibration.

3.10.3.2 Access for Calibration. Access to major PLWCS components (i.e.

calorimeter, signal generator, amplifier, filters, and power meters) input and output connectors shall be provided to perform individual calibration of these components.

3.10.4 Maintenance provisions. Equipment shall be as specified herein 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 will occur and no permanent distortion to any structural member will be caused during maintenance, calibration, and adjustment/alignment.

b. Accessibility for repair. The equipment shall be designed so that any user replaceable assemblies (URAs) available can be removed without removing other hardwired subassemblies or components. There shall be no need to unsolder cables or interconnecting wiring to remove URAs.

Assemblies designed primarily to distribute power signals to other components are excluded from this requirement. When troubleshooting/repair information is provided and access to both sides of

URAs is necessary, the design of the equipment shall facilitate this directly or through extender cards.

c. Adjustment/Alignment. The equipment shall be provided with any necessary instructions/software needed to adjust/align the equipment so that the equipment meets its performance specifications after repair or due to the equipment failing calibration.

1. Accessibility for adjustment. The equipment design shall permit adjustments of components (excluding EEPROM or other digital alignment implementations) that are changeable without removing any component, printed circuit cards, or subassembly. The use of extender cards is permitted. (Example: Access shall be provided to potentiometers that control the accuracy of specified parameters.)

2. Alignment instructions/software. If the equipment has alignment data stored in memory (example: 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. The alignment process shall be able to use calibration standards that meet all necessary minimum performance requirements to satisfy a traceable calibration.

3.11 Workmanship. The manufacturer, assembly and packaging of the items covered by this CSS shall be representative of the best commercial practices and shall conform to the requirements of this CSS. All items shall remain securely held in place during normal transit. Adequate protection shall be afforded for the equipment on all sides to avoid transient damage.

3.12 Wattmeter Workload. At a minimum the PLWCS shall support the following wattmeter workload models:

3.12.1 Lear Siegler 164B

3.12.2 Bird Electronic 43

3.12.3 Bird Electronic 4304A

3.12.4 Bird Electronic 4410

3.12.5 Bird Electronic 4410A

3.12.6 Bird Electronic 4410A2

3.12.7 Bird Electronic 4412

3.12.8 Telewave 44A

3.12.9 Bird Electronic 6154

3.12.10 Coaxial Dynamics 81000A

3.12.11 Electro Impulse DPM3

3.12.12 Instrument Flight Research TS4317GRM

3.12.13 Bird Electronic 4301

3.12.14 Bird Electronic 4311

3.12.15 Bird Electronic 4381

3.12.16 Bird Electronic 4131

3.12.17 Bird Electronic TS4291P

3.12.18 Bird Electronic 4314

3.12.19 Bird Electronic 4391

3.12.20 Bird Electronic 4391M

3.12.21 Bird Electronic 6104

3.12.22 Bird Electronic 612

3.12.23 Bird Electronic 6156

3.12.24 Lexan Industries 1219-D-001-G

3.12.25 Bird Electronic 4372

3.12.26 Bird Electronic 61

3.12.27 Bird Electronic 611

3.12.28 Bird Electronic 6835

3.12.29 Bird Electronic 694

3.12.30 Electro Impulse Laboratory ANURM43C

3.12.31 Bird Electronic ANURM86A

3.12.32 Electro Impulse Laboratory ME11BU

3.12.33 Electro Impulse Laboratory ME11CU

3.12.34 Electro Impulse Laboratory TS1771U

3.12.35 Lexan Industries ANURM120

3.12.36 Bird Electronic 4421

3.12.37 Lexan Industries TS1285URM120

3.12.38 Bird Electronic 6151

3.13 Wattmeter workload test point support. PLWCS power/frequency outputs (at the accuracy cited in 3.9.4.6) needed to support all wattmeter workload models cited in 3.12.

1 W

2.5 W

3 W

5 W

8 W

10 W

25 W

30 W

50 W

80 W

100 W

250 W

300 W

500 W

800 W

1000 W

2 MHz

X

2.5 MHz

30 MHz

35 MHz

40 MHz

50 MHz

60 MHz

100 MHz

125 MHz

150 MHz

250 MHz

300 MHz

400 MHz

800 MHz