PD_Rev4_16E-159A-DC_20_April_2016.docx

16E-159A-DC

PURCHASE DESCRIPTION

Transconductance Amplifier

1.0 SCOPE: This purchase description describes a Transconductance Amplifier that will be used by the Air Force Primary Standards Laboratory (AFPSL) and the Air Force Precision Measurement Equipment Laboratories (PMEL) to support AC and DC current measurements up to 100 Amps from DC to 100kHz.

2.0 DEFINITION: The following will discuss the minimum performance, design, functional, environmental, reliability requirements, and quality assurance provisions for this Transconductance Amplifier. The Transconductance Amplifier shall be capable of outputting highly accurate and stable currents from 0 to 100 amps with very low distortion. The Transconductance Amplifier shall output current with a frequency range of 0 to 100kHz, with a compliance voltage of 0 to at least 7V AC and DC.

3.0 SALIENT CHARACTERISTICS:

3.1 Output Current: The Transconductance Amplifier shall have an output current that is directly proportional to the input over the entire frequency range and shall meet or exceed the following output current specifications:

Current Range (Full Scale)

(Siemens)

3.2 Stability: The Transconductance Amplifier shall meet or exceed the following 10 minute stability specifications:

Frequency (Hz) +/- % of reading + % of range (0% to 100% of Full Scale) +/- % of reading (100% to 200% of Full Scale)

3.3 Accuracy: The Transconductance Amplifier shall meet or exceed the following 1 year measurement uncertainties and shall be valid for intervals of operation not less than 1 year:

Frequency (Hz) 1 Year 95% Uncertainty ± % of reading + % of range (0% to 100% of Full Scale) 1 Year 95% Uncertainty +/- % of reading (100% to 200% of Full Scale)

3.4 Total Harmonic Distortion: The Transconductance Amplifier shall meet or exceed the following distortion specifications:

3.5 Compliance Voltage: The Transconductance Amplifier shall have a compliance voltage of 0 to at least 7V AC and DC with an accuracy of +/-0.1V

3.6 Noise: The Transconductance Amplifier shall have a noise specification of no greater than 0.05% of the current range from DC to 100kHz.

3.7 Instrument Operation: The Transconductance Amplifier shall have front panel controls for manual operation and an IEEE-488.2 interface for remote operation.

3.7.1 Remote Interface/Programming: The Transconductance Amplifier 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.

3.8 Dimensions: The Transconductance Amplifier shall be no larger than 17 inches (43.2 cm) high, 22 inches (55.9 cm) deep, and 19 inches (48.3 cm) wide.

3.9 Weight: The Transconductance Amplifier shall not exceed 80 lbs (36.4 kg).

3.10 Operating Environment: The instrument shall perform to all specifications within the following environment:

3.10.1 Temperature Range: 22.8ºC ±3.3ºC.

3.10.2 Humidity Range: 20% to 50%RH

3.11 Storage Environment: Damage to the unit shall not occur as a result of storage in the following environment:

3.11.1 Temperature Range: -20ºC to 60ºC

3.11.2 Humidity Range: 15% to 80% RH

4.0 GENERAL REQUIREMENTS:

4.1 Rack Mount Kit: The Transconductance Amplifier shall come with the necessary hardware for mounting in a standard 19 inch electronic enclosure.

4.2 Portability: The accuracies and stability shall not be altered from normal handling and transportation of the Transconductance Amplifier.

4.3 Shipment Orientation: Damage or accuracy deterioration to the Transconductance Amplifier shall not result due to normal shipment of the unit.

4.4 Commercial Air Transportability: The Transconductance Amplifier shall be suitable for commercial air transport and shall meet all regulations that apply.

4.5 Special Hardware/Software/Licenses Requirements: Any special equipment, fixtures, tools, standards, etc., required for the calibration and verification and not common to a Primary Calibration Laboratory shall be supplied with the Transconductance Amplifier. Any unique accessories including software required for calibration and verification of the Transconductance Amplifier shall be furnished by the contractor. Units that fail calibration/verification and are recommended to be aligned or adjusted, either manually or using an automated alignment/adjustment software, the special hardware, manual instructions, software, software instructions and software license (where required by the manufacturer and shall be valid for the life of the instrument) needed to perform the alignment/adjustment process shall be included with the Transconductance Amplifier. A list of peripheral support equipment required to accomplish the calibration/alignment/adjustments of the unit shall be provided with the Transconductance Amplifier.

4.6 Mechanical and Physical Requirements:

4.6.1 Design and Construction: The Transconductance Amplifier shall be designed and constructed of material that meet the requirements of this specification and in accordance with the best commercial practices for industry approved equipment. It will be the contractors responsibility to assure the Government that such design objectives as reliability, accuracy of operation, maintainability, and ease of operation have been given due consideration in the manufacture of this equipment. The equipment shall be able to withstand the conditions met in shipping, storage, installation and service. All material and parts for this equipment shall be capable of withstanding the environmental requirements of this specification.

4.6.2 Metals: Metals shall be of corrosion resistance type or suitably treated to resist corrosion due to atmospheric conditions likely to be met in storage, service or transportation.

5.0 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 instruments shall comply with the requirements of this purchase description. All components, subassemblies, and final assembly shall comply with the examination and tests in section 11.0.

6.0 SAFETY: The design, materials and manufacture of the Transconductance Amplifier shall follow the best commercial safety standards and practices to ensure that it is safe for the operator and maintenance personnel throughout the life of the equipment.

7.0 LICENSING: Where licensing issues apply to any part of the Transconductance Amplifier, 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.

8.0 ANCILLARY/ACCESSORIES: An L-C connector to screw terminal adaptor shall be included with the Transconductance Amplifier. Any and all ancillary equipment/items and accessories (not otherwise specified) needed to perform as described shall be provided by the contractor. This would include, but not limited to, special tools, cables, fixtures, programs and standards.

9.0 FIRMWARE: Where firmware technology is employed, when a firmware upgrade is anticipated by the manufacturer during the life 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 at the same version, revision and revision date at the completion of the contract.

10.0 INTERCHANGEABILITY: All replaceable 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.

11.0 QUALITY ASSURANCE: This item shall be inspected and evaluated at destination, as specified elsewhere in this contract. This item will be evaluated with test equipment with parameters equal to or better than those required to assure specified performance requirements are met. Test equipment used is traceable to a National Metrology Institute or other AFMETCAL approved equivalent laboratory when/where required. Evaluations will be performed to assure the item meets the requirements of this purchase description. Such evaluation at destination does not relieve the contractor of performing all inspections and quality checks at the point of fabrication, as specified elsewhere in this contract, or as necessary, to ensure performance, as specified herein. In addition to all elements of this purchase description, all commercially available components provided with this item and the item itself shall, as a minimum, satisfy all commercially published performance specifications (and shall be provided by the contractor). Evaluations will also be performed to assure the item meets the requirements of the commercially published performance specifications.

12.0 Model and Serial Number Identification (IUID): This item 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