Please contact the technical staff before shipping instruments or standards to the address listed below.
Fees are subject to change without notice.
NIST provides an on-site calibration service of the accuracy of phase modulation (PM) noise and amplitude modulation (AM) noise and noise floor of the measurement systems at the customer's site by use of two separate portable PM/AM secondary noise standards. One noise standard is for carrier frequencies of 5 MHz, 10 MHz, and 100 MHz, designated as model 510100 and the other for carrier frequencies of 10 GHz, 20 GHz and 40 GHz, designated as model 102040. The first PM/AM noise standard (Model – 510100) produces two output signals at 5 MHz, 10 MHz, and 100 MHz carrier frequencies with approximately +10 dBm to +15 dBm. For these three carrier frequencies, the residual double sideband PM noise [Sφ(ƒ)] between the two outputs is typically less than -187 dBrad2/Hz for a Fourier frequency offset from the carrier of 100 kHz. The calibrated PM or AM noise is typically constant with Fourier frequency offset to +0.1 dB out to 3 % of the carrier frequency.
NIST provides calibration services of the PM noise of oscillators, amplifiers and other components. For frequencies of 5 MHz to 40 GHz, Sφ(ƒ)of oscillators and components can be determined for Fourier frequency offsets from the carrier of 0.1 Hz to a maximum of 10 MHz or 10% of the carrier. The PM noise is measured for only a few user-specified frequency offsets (typically 3 points per decade). All measurements of PM noise are made relative to 1 rad2/Hz. Typical noise floors of the measurements are shown in the table below
NIST also provides calibration services of double sideband AM noise [Sα(ƒ)] of oscillators and other components. For frequencies from 1 MHz to 40 GHz, Sα(ƒ) of oscillators and components can be determined for Fourier frequency offsets from the carrier of 0.1 Hz to a maximum of 10 MHz or 10% of the carrier. The AM noise is measured for only a few user-specified frequency offsets (typically 3 points per decade). All measurements of AM noise are made relative to a normalized average amplitude of unity, or 1/Hz.
References—PM and AM Noise Measurements
Secondary Standard for PM and AM Noise at 5, 10, and 100 MHz, F. L. Walls, IEEE Trans. I&M 42, 126 (Apr. 1993).
Calibration uncertainty for the NIST PM/AM noise standards, A. Hati, C.W. Nelson, N. Ashby, and D.A. Howe, NIST Spec. Publ. 250-90, (July 2102).
Properties of Signal Sources and Measurement Methods, D. A. Howe, D. W. Allan, and J. A. Barnes, in Characterization of Clocks and Oscillators, edited by D. B. Sullivan, D. W. Allan, D. A. Howe, and F. L. Walls, Natl. Inst. Stand. Technol. Tech. Note 1337, 14-16 (1990).
Characterization of Clocks and Oscillators, D. B. Sullivan, D. W. Allan, D. A. Howe, and F. L. Walls, eds., NIST Tech. Note 1337 (Mar. 1990).
Frequency and Time-Their Measurement and Characterization, S. R. Stein, Precision Frequency Control, Vol. 2, edited by E. A. Gerber and A. Ballato (Academic Press, NY), 191-232 (1985).Calibrations Phone: 301-975-2200, Fax: 301-975-2950 NIST, 100 Bureau Drive, Stop 8363, Gaithersburg, MD 20899-8363