time and frequency laboratory
E344840
The time and frequency laboratory is a specialized metrology facility that maintains and disseminates ultra-precise time and frequency standards for scientific, industrial, and national timing applications.
All labels observed (1)
| Label | Occurrences |
|---|---|
| time and frequency laboratory canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3278215 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: time and frequency laboratory Context triple: [National Physical Laboratory, hasFacility, time and frequency laboratory]
-
A.
U.S. Naval Observatory Master Clock
The U.S. Naval Observatory Master Clock is the primary time standard of the United States, providing ultra-precise reference time for military, governmental, and global positioning system (GPS) operations.
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B.
IEEE 1588 Precision Time Protocol standard
The IEEE 1588 Precision Time Protocol standard defines a method for highly accurate time synchronization over packet-based networks, widely used in industrial automation, telecommunications, and power systems.
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C.
Physical Sciences Laboratory
The Physical Sciences Laboratory is a research division focused on studying atmospheric and related physical processes within NOAA’s Earth System Research Laboratories.
-
D.
cesium atomic clocks
Cesium atomic clocks are ultra-precise timekeeping devices that use the microwave frequency of cesium atoms’ electron transitions to define and maintain the international standard for the second.
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E.
Mathematical Laboratory
The Mathematical Laboratory was the original name of the University of Cambridge’s computing department, which became a pioneering center for early computer science research and development.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: time and frequency laboratory Target entity description: The time and frequency laboratory is a specialized metrology facility that maintains and disseminates ultra-precise time and frequency standards for scientific, industrial, and national timing applications.
-
A.
U.S. Naval Observatory Master Clock
The U.S. Naval Observatory Master Clock is the primary time standard of the United States, providing ultra-precise reference time for military, governmental, and global positioning system (GPS) operations.
-
B.
IEEE 1588 Precision Time Protocol standard
The IEEE 1588 Precision Time Protocol standard defines a method for highly accurate time synchronization over packet-based networks, widely used in industrial automation, telecommunications, and power systems.
-
C.
Physical Sciences Laboratory
The Physical Sciences Laboratory is a research division focused on studying atmospheric and related physical processes within NOAA’s Earth System Research Laboratories.
-
D.
cesium atomic clocks
Cesium atomic clocks are ultra-precise timekeeping devices that use the microwave frequency of cesium atoms’ electron transitions to define and maintain the international standard for the second.
-
E.
Mathematical Laboratory
The Mathematical Laboratory was the original name of the University of Cambridge’s computing department, which became a pioneering center for early computer science research and development.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
metrology laboratory
ⓘ
scientific facility ⓘ standards laboratory ⓘ |
| disseminates |
frequency standards
ⓘ
time standards ⓘ |
| ensures |
traceability to international standards
ⓘ
traceability to national standards ⓘ |
| hasDomain |
frequency metrology
ⓘ
time metrology ⓘ |
| maintains |
frequency standards
ⓘ
time standards ⓘ ultra-precise frequency references ⓘ ultra-precise time references ⓘ |
| mayBePartOf |
national metrology institute
ⓘ
linked to:
National Metrology Institutes
research organization ⓘ standards organization ⓘ university ⓘ |
| monitors |
clock performance
ⓘ
frequency stability ⓘ time scale stability ⓘ |
| objective |
provide accurate frequency
ⓘ
provide accurate time ⓘ support international time coordination ⓘ support national time scale ⓘ |
| performsActivity |
frequency calibration
ⓘ
frequency dissemination ⓘ time calibration ⓘ time dissemination ⓘ time scale generation ⓘ traceability assurance ⓘ uncertainty evaluation ⓘ |
| supportsApplication |
financial time-stamping
ⓘ
industrial timing applications ⓘ national timing applications ⓘ navigation systems ⓘ power grid synchronization ⓘ satellite systems ⓘ scientific timing applications ⓘ telecommunications synchronization ⓘ |
| usesInstrument |
GNSS receivers
ⓘ
GPS receivers ⓘ atomic clocks ⓘ cesium atomic clocks ⓘ frequency counters ⓘ frequency synthesizers ⓘ hydrogen masers ⓘ optical clocks ⓘ phase comparators ⓘ time interval counters ⓘ time transfer equipment ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: time and frequency laboratory Description of subject: The time and frequency laboratory is a specialized metrology facility that maintains and disseminates ultra-precise time and frequency standards for scientific, industrial, and national timing applications.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.