The Mass & Force Group, Quantum Measurement Division, NIST, intends to procure a Reciprocity Calibration Apparatus type 5998 to provide high accuracy transfer impedance measurements of laboratory standard microphones in customized measurements. The system must be compatible with laboratory standard microphones and additional standard reciprocity calibration equipment. The system is to be a standalone unit, i.e. an entire reciprocity calibration system 9699 is not required.

The required Reciprocity Calibration Apparatus type 5998 must meet the following technical specifications:

1. Microphone Compatibility: Compatible with LS1P laboratory standard microphones and LS2aP laboratory standard microphones

2. Frequency range: 20 Hz – 25 kHz

3. Repeatability of transfer impedance measurement (2σ)

a. LS1P: ±0.005 dB

b. LS2aP: ±0.008 dB

4. Distortion: < 0.01% THD at 1V, 1kHz

5. Input Noise < 10 microvolts, 20Hz to 25kHz

6. Output Noise < 300 microvolts, 20Hz to 25kHz

7. Gain Stability .001dB/h at 23°C

8. Polarization voltage supply: 200 V, adjustable +/- 0.5 V

9. Polarization voltage long-term stability ±150ppm/year

10. Polarization voltage temperature stability ±20ppm/°C

11. Electrical connections for microphone channels: LEMO 7-pin

12. Electrical Power Supply: Must operate from 60 Hz 120 VAC.

Market research was conducted and the only system able to meet all of the specifications provided above is the system manufactured by Hottinger Bruel & Kjaer, Inc. Hottinger Bruel & Kjaer does not have authorized resellers/distributors.

The North American Industry Classification code for this acquisition is 334516, Analytical Laboratory instrument Manufacturing with 1000 employees.

A determination by the Government not to compete the proposed acquisition based upon responses to this notice is solely within the discretion of the Government. Information received will be considered solely for the purpose of determining whether to conduct a competitive procurement.

No solicitation package will be issued. This notice of intent is not a request for competitive quotations. This notice of intent is not a request for quotations; however, all responsible sources interested may identify their interest and capability to respond to this requirement. Interested parties that believe they can satisfy the requirements listed above must identify their capability in writing before the response date of this notice. Only responses received by 12:00 p.m. Eastern Standard Time on August 22, 2023, will be considered by the government. Responses shall be submitted via email to elizabeth.timberlake@nist.gov with a cc to joni.laster@nist.gov.

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