PD_16E-182A-RF_data_attachment.pdf

16E-182A-RF

21 July 2015

Rev 2

DIRECTORATE OF METROLOGY

PURCHASE DESCRIPTION

FOR

High Precision Step Attenuator

1.0 SCOPE: This purchase description describes a High Precision Step Attenuator to be used by the Air Force’s Precision Measurement Equipment Laboratories (PMEL) and Air

Force Primary Standards Laboratory (AFPSL) to support a variety of attenuation measurement systems and equipment including attenuation measurement receivers, spectrum analyzers, signal analyzers, and vector network analyzers.

2.0 PERFORMANCE REQUIREMENTS: The High Precision Step Attenuator must meet or exceed the following 1 year measurements uncertainties with a 95% confidence level.

2.1 Frequency range: DC to 1.2 GHz

2.2 Attenuation range: 0 to 110 dB

2.3 Resolution: 10 dB steps

2.4 VSWR: <=1.1 on all ports with no pads

2.5 Repeatability: <=0.006 dB at 10 dB setting + 0.004 dB per 10 dB step, max to min difference

2.6 Impedance: 50 Ohms

2.7 Maximum Power: 1 Watt (average)

3.0 FUNCTIONAL REQUIREMENTS: Automated and Manual Control: Automated and manual operation shall be provided.

3.1 Manual Control: All attenuation settings shall be viewable and controllable manually through interfaces such as panel or rotary knobs.

3.2 Automated Control: All attenuation settings shall be capable of being fully automated with an integrated switch driver.

3.2.1 I/O Communication Interface: This item shall be programmable via an IEEE 488 interface connection by an external controller. It shall adhere to Standard Commands for

Programmable Instruments (SCPI) and IEEE-488.2. Complete command set documentation shall be included.

4.0 MECHANICAL & PHYSICAL REQUIREMENTS:

4.1 Connectors: N-Type female connections

4.2 Dimensions: The High Precision Step Attenuator can be of benchtop configuration or rack mount. The High Precision Step Attenuator shall not exceed fitting into a standard

19 inch rack width and be less than 7 inches tall.

4.3 Weight: The High Precision Step Attenuator shall not exceed 50 lbs.

4.4 Mounting: If a rack mounted instrument is provided, standard 19 inch mounting hardware shall be included.

4.5 Cables: A communication cable between switch driver and attenuator (if applicable) shall be included.

5.0 TRANSIT CASE: A reusable Transit Case shall be included with each High Precision

Step Attenuator that will house the step attenuator and all accessories. The Transit Case will be a “clam shell” type case and must meet the following requirements:

5.1 Materials: The case body and covers shall be constructed of fire retardant, molded fiberglass, reinforced plastic, or other composite materials suitable for the purpose intended.

5.2 Clasps: Heavy duty, corrosion resistant clasps or latches shall be attached to the case.

The clasps or latches shall prevent any separation of the closure or unlocking of the clasps when the case is subjected to shipping conditions.

5.3 Hinges: The case hinges shall have corrosion/erosion resistant properties and allow for easy opening and closing of the case.

5.4 Handles: An appropriate number of handles shall be attached to the case for the purpose of lifting the total weight of the case plus the weight of the High Precision Step

Attenuator and accessories.

5.5 Cushioning: The top and bottom shells of the case shall be lined with polyurethane foam cushioning material. The minimum thickness shall be 2 inches.

5.6 Crushproof: The case shall be crushproof to 400 lbs. applied uniformly to the largest face without damage.

6.0 CONTROL REQUIREMENTS:

6.1 Software Programming: The High Precision Step Attenuator attenuation value shall be set using a fixed number of "send" type commands without having to evaluate any "read" commands.

6.2 Firmware: When a firmware or software upgrade is anticipated by a manufacturer during the life cycle of this contract, the contractor shall contact AFMETCAL for concurrence. If AFMETCAL concurs with the proposed upgrade all previous units shall be updated to this upgrade. All firmware or software provided under this contract shall be of the same version, revision, and revision date at the completion of the contract.

7.0 GENERAL REQUIREMENTS:

7.1 Safety: Protection shall be provided from, but not limited to, safety hazards as specified herein.

7.1.1 Accessible Potentials: Operating and maintenance personnel shall be protected from hazardous potentials by shielding, marking, or other suitable measures. Parts of equipment which become accessible upon removing a cover, opening a door, adjusting a control, setting a supply circuit voltage mechanism, replacing a fuse, attaching and detaching an interconnecting cable assembly, etc. and are intended for access by the operator during normal use shall not render an electric shock.

7.1.2 Grounding: During operation of the fully assembled test equipment, all electrically conductive external surfaces except trim and identification plates shall be at earth ground potential. Ground connection shall be of sufficient mechanical strength to minimize the possibility of ground disconnection. Such ground path shall have sufficiently low impedance and ample capacity to conduct safely any operating or fault currents imposed on it.

7.1.3 Thermal Hazards: Protection shall be provided from equipment temperatures which could constitute a hazard to personnel.

7.1.4 Mechanical Hazards: Suitable protection shall be provided to prevent contact with moving mechanical parts when the equipment is complete and operating. Sharp projections on enclosures shall be avoided.

7.2 Parts, Materials, and Processes: Parts, materials, and processes associated with the equipment shall meet the following requirements.

7.2.1 Coaxial Cable Electrical Insulation: Materials used in electronic cable and connector technology shall be selected such that they degrade by a mechanism other than elimination and shall be resistant to corrosion and reductions in performance.

7.2.2 Selected Components: Matched and selected components as well as specially built, nonstandard components shall not be used.

7.2.3 Metals: Metals shall be of the corrosion-resistant type or shall be metallurgically processed or suitably treated to resist corrosion due to atmospheric conditions likely to be met in storage, service, and/or transportation. Dissimilar metals in close contact with each other shall not be present.

7.2.4 Design and Construction: The equipment shall be designed and constructed of materials that meet the requirements of this specification and in accordance with the best commercial practices for industry approved equipment. It shall be designed and manufactured to achieve reliability, maintainability, accuracy of operation, and ease of operation. All parts such as shafts, bearings, regulators, switches, controls, etc., shall have proper clearance and adjustments. They shall work together so that the equipment will supply the rated requirements without unnecessary strains, vibrations, or overheating. They shall be able to withstand the conditions met in shipping, storage, installation, and service. All material and parts of this equipment shall be capable of withstanding the environmental requirements of this specification.

7.3 Electrical Power Sources and Connections:

7.3.1 Power Requirements: The equipment shall operate within the specified performance and accuracy requirements under nominal power conditions of either commercial, military, and/or shipboard single-phase power sources of 110 volts (rms) or 220 volts

(rms) plus or minus 10%, at 50 and 60 Hz plus or minus 5% single phase input power.

7.3.2 Input Power Switch: There shall be an input power on / off switch located on the front panel of the equipment.

7.3.3 Power Cord: An assembled power cord of at least 6 feet in length for operation at the appropriate voltage shall be provided with each High Precision Step Attenuator.

7.3.4 Fuses or Circuit Breakers: Fuses or circuit breakers shall be provided to automatically disconnect the equipment from the source in the event of excessive current drain. If circuit breakers are used, both sides of the power source shall be automatically disconnected from the equipment in the event of excessive current. If fuses are used, only the high side of the input power line shall be fused. Fuses and circuit breakers shall be readily accessible.

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

7.3.6 Polarization: The polarization of all cable connectors shall be accomplished by a mechanical or visual method that prevents inadvertent mating in more than one position.

7.3.7 Plug-in Cabling: All plug-in cabling shall be capable of being connected and disconnected without disassembly or removal of adjacent components.

7.4 Enclosure: The High Precision Step Attenuator shall have an enclosure. The enclosure shall be constructed of aluminum, plastic, or fiberglass. The enclosure shall provide protection from mechanical shock and conditions associated with bench-top use and shall have no openings on the top surface.

7.5 Warm-Up, Continuous Operation, Environmental Requirements:

7.5.1 Warm-Up Period: After a warm-up period not to exceed 90 minutes, the High Precision

Step Attenuator shall meet all specifications contained in this PD unless otherwise specified.

7.5.2 Continuous Operation: After the required warm-up period, the High Precision Step

Attenuator shall meet all specifications of this purchase description and shall not display any intermittent characteristics or overheating for an extended period of not less than 8 hours of continuous operation.

7.5.3 Operating Temperature Range: The High Precision Step Attenuator shall meet the specified performance and accuracy requirements over the operating temperature range of

73 ± 6 degrees Fahrenheit.

7.5.4 Operating Relative Humidity Range: The High Precision Step Attenuator shall meet the specified performance and accuracy requirements over the operating relative humidity range of 20 to 50%.

7.5.5 Non-operating Storage Temperature: Damage to the the High Precision Step

Attenuator shall not occur as a result of storage at temperatures ranging from 15 to 140 degrees Fahrenheit (-9 to 60 Celsius).

7.5.6 Non-operating Storage Relative Humidity: Damage to the The High Precision Step

Attenuator shall not occur as a result of storage at Relative Humidity levels of 15 to 80%.

7.6 Ancillary/Accessories: Any and all ancillary equipment/items and accessories (not otherwise specified) necessary for normal operation of the High Precision Step

Attenuator shall be supplied.

7.7 Metric Products: Products manufactured to metric dimensions will be considered on an equal basis with those manufactured using inch/pound units, provided they fall within the specified tolerances using conversion tables contained in the latest revision of Federal

Standard No. 376, and all other requirements of this purchase description are met.

8.0 WORKMANSHIP: The workmanship shall be first class, of neat general appearance, and comply with standard commercial practices. The standards of workmanship shall be such that the instrument shall comply with the requirements of this purchase description.

All components, subassemblies, and final assembly shall comply with the examination and tests in section 10.0.

9.0 INTERCHANGEABILITY: All replacement assemblies, subassemblies, components, and parts of a designated model provided under a single contractor or ordered from any one manufacturer shall be fully interchangeable without interference or degradation of performance.

10.0 TESTING: The High Precision Step Attenuator shall be inspected and accepted at destination as specified elsewhere in the contract. The item will be checked with test equipment whose parameters are equal to or better than those required to ensure specified performance requirements are met. Test equipment used, where required, has first echelon certification directly traceable to a National Metrology Institute or other

AFMETCAL approved equivalent laboratory. Tests shall be performed to ensure the

High Precision Step Attenuator meets the requirements of this purchase description, OEM commercial manuals, and/or any AFPSL check standards with documented historical data deemed appropriate by the government. Such testing at destination does not relieve the contractor of performing all inspections and quality checks at the point of fabrication, as specified elsewhere in the contract, or as necessary, to ensure performance as specified herein.

11.0 LICENSING: Where licensing issues apply to any part of the High Precision Step

Attenuator, such licensing and associated documents shall be obtained and provided by the contractor. Licenses shall not contravene federal law, federal procurement regulations, or the requirements of this acquisition.

12.0 MODEL & SERIAL NUMBER IDENTIFICATION (IUID): The High Precision

Step Attenuator shall be clearly labeled with a model, serial number, and manufacturer’s name. Unique item identification labeling shall follow the Item Identification and

Valuation clause as stated in the contract.

Attachment:

Data Requirements

Attachment to

Purchase Description 16E-182A-RF

High Precision Step Attenuator

DATA REQUIREMENTS

MANUALS: A complete user and service manual and calibration procedure shall be provided with each unit in contractor format. Manuals shall be on CD/DVD-ROM in Indexed Portable Document Format

(iPDF). The manuals shall comply with Data Item Description (DID) DI-TMSS-80527C and the Contract

Data Requirements List (DD Form 1423).

CALIBRATION CERTIFICATE: A calibration certificate, traceable to the National Institute of Standards and Technology (NIST) or other national metrology institutes (NMIs) shall be provided with each instrument. This calibration certificate must comply with Data Item Description (DID) DI-QCIC-80798B and the Contract Data Requirements List (DD Form 1423).