NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

EVENTS

2025 NIST Time and Frequency Seminar

Share

NIST Time and Frequency July 29-31, 2025 NIST Boulder

NIST Time and Frequency Division's annual seminar covers precision clocks and oscillators, atomic frequency standards, rf and optical synchronization, optical oscillators, quantum information, optical cooling and heating; making precise frequency, time, phase-noise, and jitter measurements; and establishing measurement accuracy and traceability. This 3-day course is the most comprehensive available.


Tuesday, July 29, 2025
8:00 - 9:00Registration and check-in; 9:00 – 9:10 Welcome by Archita Hati
9:10 - 9:40(CH1) Timekeeping and Time Distribution, Elizabeth Donley
9:40 - 10:10(CH2) Oscillator Measurement Definitions and Concepts – I, David Howe
10:10 - 10:30Break
10:30 - 11:00(CH2) Clock Measurement Definitions and Concepts – II, David Howe
11:00 - 12:00(CH3) Introduction to Time Domain Measurement Standards, Jeff Sherman
12:00 – 12:45Lunch
12:45 - 2:15(CH4) Time-Domain Analysis, Jeff Sherman
2:15 – 2:50(CH5) Time-Domain and Frequency-Domain, David Howe
2:50 – 3:20Break
3:20 - 4:30(CH6) Techniques of State-of-the-Art PM and AM Noise Measurements, Craig Nelson
4:30 – 5:10(CH7) Vibration-Induced Phase Noise: Oscillators and Non-Oscillatory Components, Archita Hati
Wednesday, July 30, 2025
8:30 -8:45Archita Hati / David Howe: Announcements
8:45 – 9:30(CH8) Direct Digital Measurement of Precision Oscillators, Marco Pomponio
9:30 – 10:05(CH9) Optical Frequency Division for Ultralow Phase Noise Microwaves, Frank Quinlan
10:05 – 10:30Break
10:30 – 12:00(CH10) Introduction to GNSS for Position, Navigation, and Timing, Penina Axelrad
12:00 – 12:45Lunch
12:45 – 1:00Go to Bldg. 81 - Convene in Rm 1A116 for live Demonstrations
1:00 – 2:15(CH11) Time and Frequency Measurement Demonstration, Andrew Novick, Ben Pera
2:15 – 2:35Break
2:35 – 4:00(CH12) Data Analysis Demonstration, featuring Stable32
4:00 – 5:00(CH13) Remote Time and Frequency Calibrations Demonstration, Andrew Novick and Ben Pera
6:00 - 8:30Off-site Open House Microchip Technology Inc.
Thursday, July 31, 2025
8:00 - 8:15Questions and Answers
8:15 - 9:00(CH14) Precise and Accurate Network Timing, Jeff Sherman
9:00 - 9:50(CH15) Cs Fountains at NIST, Greg Hoth
9:50 - 10:30(CH16) Optical Atomic Frequency Standards, Andrew Ludlow
10:30 - 10:50Break
10:50 - 11:20(CH17) Chip-Scale Atomic Sensors and Clocks, William McGehee
11:20 - 12:00(CH18) Time Transfer Alternatives to GNSS, Common-view, Jeff Sherman
12:00Conclusion and Discussion
2:00 – 4:00Tours of Time Scale and Primary Standard 

Booking link below:

https://www.marriott.com/event-reservations/reservation-link.mi?guestreslink2=true&id=1744757805846&key=GRP

If you prefer to book over the telephone, 
Please have them call 720-673-8900 and reference code "NIST TIME AND FREQUENCY"

Visitor Access Requirement:

  • For Non-US Citizens:  Please have your valid passport for photo identification.*
  • For US Permanent Residents: Please have your green card for photo identification.*
  • For US Citizens: Please have your state-issued driver's license. Regarding Real-ID requirements, all states are in compliance or have an extension through May 2025.*
    NIST also accepts other forms of federally issued identification in lieu of a state-issued driver's license, such as a valid passport, passport card, DOD's Common Access Card (CAC), Veterans ID, Federal Agency HSPD-12 IDs, and Military Dependents ID.
    *Use of apps, physical photocopies, and/or digital screenshots of your ID, Passport or Green card will not be accepted.
Advanced communications, Quantum communications, Electronics, Electromagnetics, Semiconductors, Sensors, Information technology, Artificial intelligence, Machine learning, Location based services, Networking, Network test and measurement, Software research, Software testing, Manufacturing, Robotics, Navigation / actuation / control, Mathematics and statistics, Experiment design, Modeling and simulation research, Statistical analysis, Uncertainty quantification, Metrology, Electrical / electromagnetic metrology, Optical / photometry / laser metrology, Time and frequency metrology, Physics, Atomic / molecular / quantum, Optical physics and communications, Time and frequency, Standards, Accreditation, Calibration services, Reference instruments and Standards education
Created February 18, 2025, Updated July 25, 2025
Was this page helpful?