Category: Reference
Time and Frequency - High precision time dissem...

Time and Frequency - High precision time dissem...

       iOS Universal

Time rules our life more than ever. Everybody uses clocks everytime, everywhere. But did you ever wonder, how and especially how exactly time can be measured? Then this App is right for you. It provides indepth background information about atomic clocks and the so called "Time Dissemination Services".

The App focuses on the base unit “second” which is one of the seven base units, defined by the “International System of Units” (SI). The other base units are: metre, kilogram, ampere, kelvin, mole and candela.

A second is the output of atomic clocks and defined as follows: “The second is the duration of 9.192.631.770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.”

The Bureau International du Temps et des Mésures at Sèvres, near Paris (France) is the controlling-center of the unit “second”, continuously supplied by about 250 atomic clocks located in 61 time laboratories all over the world.

This App is presenting these time laboratories with their:

■ Acronyms,
■ Addresses,
■ URLs,
■ Geographical Coordinates (Longitude and Latitude) and
■ Technical equipments.

The unit “second” (in other words: “the exact time”) is available to everyone directly from these time laboratories by means of their „Time Dissemination Services”.

The App explains the time dissemination methods such as:

■ Telephone Time Service („Telephone voice announcement“, “Automated Computer Time Service”, “Talking Clock Service“, “Speaking Clock Service” etc.),
■ Web Clock Service
Internet Time Service („Network Time Protocol” (NTP))
■ Wireless Time Services via long- or shortwave radio (Standardfrequency and Time Signal broadcasts).

For a better understanding of these time dissemination methods diagrams, images and even audio files are attached.

Finally the App provides a Glossary with terms like: “ACTS Time Code”, “Daytime Protocol”, “Network Time Protocol”, “Primary Standard”, “Stratum” and others that are commonly used in this fascinating area of science.

This App is based on the German book “Zeit & Frequenz” (“Time & Frequency”) published by Gerd Klawitter of the Verlag für Technik und Handwerk, Baden-Baden, Germany. It is available entirely in English language.

What's new

■ Updated information for the Fukushima Time Server
■ Updated Glossary
■ iPhone 5 4" screen support


Screenshot 1 of 10

Share with Others

Last changed:
Apr 01, 2013
Marcus Roskosch
18.3 MB

Current Version Average Rating:
No data

All Versions Average Rating:
No data
Other Apps By This Developer
Allied Toolbox
Amateurfunk Klasse A - Lernen für die Lizenzprüfung leicht gemacht
Amateurfunk Klasse E - Lernen leicht gemacht
Auto & Verkehr - Die App mit Antworten und Hilfe bei Fragen im Straßenverkehr
Corporate Wording® Thesaurus
Das Funk-Lexikon - für unterwegs!
Electronic Toolbox Pro
Englisch Klasse 7 - Lernkarten in sechs Phasen Vokabeln lernen
Gedichte - klassisch bis modern
ILT-Schule HB3 - Der sichere Weg zur CH-Amateurfunklizenz
ILT-Schule HB9 - Der sichere Weg zur CH-Amateurfunklizenz
Italienisch 1 - Lernkarten in sechs Phasen Vokabeln lernen
LRC - Long Range Certificate leicht gemacht
Latein 1 - Lernkarten in sechs Phasen Vokabeln lernen
Latein 2 - Lernkarten in sechs Phasen Vokabeln lernen
Latein 3 - Lernkarten in sechs Phasen Vokabeln lernen
Lernkarten Editor - Für die Lernkarten Apps
NetworkToolbox - Network scanning and analyzing
Offshore Radio. All ships, all anchorpositions, all programs, all DJs and lots of technical and background Info
Quotes and sayings - Always a good quote!
RF Toolbox Pro
Radio Guide - Rundfunksender in Deutschland, Österreich, Schweiz und mehr
SBF Binnen - Der sichere Weg zum Sportbootführerschein
SBF See - Der sichere Weg zum Sportbootführerschein See
SKS Sportküstenschiffer - Der sichere Weg zum Sportküstenschifferschein
SRC - Short Range Certificate leicht gemacht
Spanisch 1 - Lernkarten in sechs Phasen Vokabeln lernen
Spezial Frequenzliste 2013/14
Sportboot Demo - Die Beispiel App zu SBF Binnen, SBF See, SKS, UBI, LRC und SRC
Synonyme - 100.000 Ersatzwörter in einer App!
UBI - UKW-Sprechfunkzeugnis für den Binnenschifffahrtsfunk
Vokabeln - Lernkarten in sechs Phasen Vokabeln lernen
Was War Am - Geschichte neu erleben
Welt der Spur - Kriminaltechnik leicht gemacht
Zitate und Sprüche - Immer den passenden Spruch parat
iCluster - The DX-Cluster database