MODIFICATION
66 -- Transducer Calibration and Wide-Band Dynamic Signal Analysis System (TCDSAS)
- Notice Date
- 7/28/2010
- Notice Type
- Modification/Amendment
- NAICS
- 333314
— Optical Instrument and Lens Manufacturing
- Contracting Office
- Department of Commerce, National Institute of Standards and Technology (NIST), Acquisition Management Division, 100 Bureau Drive, Building 301, Room B129, Mail Stop 1640, Gaithersburg, Maryland, 20899-1640
- ZIP Code
- 20899-1640
- Solicitation Number
- SB1341-10-RQ-0545
- Archive Date
- 9/30/2010
- Point of Contact
- Joni L Laster, Phone: 301-975-8397, Todd D Hill, Phone: 301-975-8802
- E-Mail Address
-
joni.laster@nist.gov, todd.hill@nist.gov
(joni.laster@nist.gov, todd.hill@nist.gov)
- Small Business Set-Aside
- N/A
- Description
- The purpose of this amendment is to address vendor questions/answers and incorporate a due date/time for all questions to be submitted. 1. Questions/Answers: Line Item 1, Requirement 3 states "TCDSAS shall be capable of performing automated measurements for SI traceable calibrations of vibration transducers by comparison or by substitution as well as vibration transducer signal conditioning amplifiers (both charge and voltage) according to procedures consistent with ISO 16063 Part 21, as well as to perform general purpose measurements of which the PC and Dynamic Signal Analyzer are capable." The following questions are related to the 2003 revision of ISO 16063 Part 21 (most recent revision) 1.1 Question: ISO 16063 does not contain any reference to calibration by substitution. Please provide a detailed technical description of the method requested or reference a released and public available description of the method. Answer: General: this system, consisting of control software and a Fast Fourier Transform Analyzer (Dynamic Signal Analyzer), is intended to replace existing software and a Dynamic Signal Analyzer (DSA) currently in use with existing vibration generators, primary and secondary reference transducers, signal conditioners, and power amplifier for use in the secondary calibration of accelerometers by comparison. As such, the system will consist only of control and calibration software, a DSA, signal conditioners, and associated computer. Therefore, the performance specifications of the hardware contained in the RFQ apply only to the DSA and signal conditioning amplifiers and their calibration not to the calibration system in its entirety. 1.2 Question: The Scope of ISO 16063 (Section 1) is for calibration of "vibration transducers by comparison". The methods described in this document do not apply to vibration transducer signal conditioning. Please provide a detailed technical description of the method requested or reference a released and public available description of the method. Answer: ISO 16063-21:2003 was published as a revision of ISO 5347-3:1993 in 2003 and unanimously reaffirmed in 2008 by the participating members of ISO TC108/SC3 with ISO 16063-21/Cor 1:2009 published in 2009. The reference to this standard refers specifically to "procedures consistent with ISO 16063 Part 21" not the equipment and their specifications contained in the standard in its entirety. ISO 16063-21/Cor 1:2009 contains predominantly minor editorial changes to equations appearing in Annex A (normative) and Annex D (informative). 1.3 Question: ISO 16063 (Figure 1) shows an example of a measuring system for vibration calibration. The minimum set of hardware components for this type of calibration are: a. Exciter b. Power Amplifier c. Reference Transducer d. Signal amplifiers (for the reference and test sensor) e. Voltmeter (or Dynamic Signal Analyzer [DSA] in this case) The solicitation provides detailed information for the Signal Amplifiers and DSA, but NO information for the reference transducer, power amplifier or exciter. These components are required to fulfill the purpose of this system and can have an enormous impact on the price of a proposed system. Please provide specifications for the additional required system components. Answer: The calibration of charge amplifiers is through the use of an existing calibrated standard capacitor coupled to the input of a charge amplifier and then measuring the Frequency Response Function of the drive voltage to the capacitor to the output voltage of the charge amplifier and obtaining gain by multiplying the FRF by the calibrated values of the standard capacitor as a function of frequency. The calibration of IEPE amplifiers is through the use of an existing impedance matching network coupled to the input of the IEPE amplifier and then measuring the Frequency Response Function of the drive voltage to the impedance matching network to the output voltage of the IEPE amplifier. The values of these gains are to be stored and utilized in obtaining calibrated charge and voltage sensitivities of piezoelectric and IEPE accelerometers. 1.4 Question: The solicitation has no mention of calibration uncertainty requirements. Since there is a direct correlation between uncertainty and price, we request a statement of desired calibration uncertainty for this solicitation. Answer: The substitution method is typically used to obtain a calibrated response function for back-to-back transducers when used to calibrate a unit under test. The idea is to obtain a frequency response function for a back-to-back transducer relative to a single ended reference transducer and then substitute a single ended unit under test for the reference transducer and obtain a frequency response function for the unit under test relative to the back-to-back transducer. Multiplying these two frequency response functions yields a response function for the unit under test relative to the reference accelerometer. This process then compensates for any mass loading and resonance effects that might be present in the response of the back-to-back transducer. 1.5 Question: The evaluation Criteria lists "past performance and experience" as two aspects that, when combined, are more important than price. We have not seen these criteria in a public solicitation before and would like more information on how these aspects will be evaluated. Answer: The evaluation criteria list all three of the non-price factors as more important than price, not just past performance and experience. The combination of the three shall be more important than price. Of course price will be evaluated for reasonableness. Should all quoters be considered equal in the areas of the non-price factors, price shall be the determining factor. 2 Quoter's must submit all questions concerning this solicitation in writing to joni.laster@nist.gov. Questions should be received no later than 7 calendar days after the issuance date of this solicitation. Any responses to questions will be made in writing, without identification of the questioner, and will be included in an amendment to the solicitation. Even if provided in other form, only the question responses included in the amendment to the solicitation will govern performance of the contract.
- Web Link
-
FBO.gov Permalink
(https://www.fbo.gov/spg/DOC/NIST/AcAsD/SB1341-10-RQ-0545/listing.html)
- Place of Performance
- Address: 100 Bureau Drive, Gaithersburg, Maryland, 20899, United States
- Zip Code: 20899
- Zip Code: 20899
- Record
- SN02220597-W 20100730/100728235251-12dbfba1ada7930412a3901026dcbe52 (fbodaily.com)
- Source
-
FedBizOpps Link to This Notice
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