BIPM Time Dept database
BIPM Time Department Data Base

Current atomic clocks participation in TAI statistics :

( this table does not reflect the effective current participating clock number :
all clocks not officially declared as 'stopped' by laboratories in the database are visible in this table )

Total H-maserCs clockRubidiumOther
630 247368015


Monthly clock statistics:


Atomic Clocks and PSFS terminology for BIPM clock codes :

Laboratories contributing to TAI have to provide clock data using a BIPM clock identification code.
The rule for BIPM clock code generation is defined here and an automatic tool to provide BIPM clock code is available here.

The list of codes used to generate clock codes can be found below :

Clock type codeClock typeClock model codeClock model
12Commercial Cesium clockHEWLETT-PACKARD 5061A
13Commercial Cesium clockEBAUCHES, OSCILLATOM B5000
14Commercial Cesium clockHEWLETT-PACKARD 5061A OPT. 4
15Commercial Cesium clockDATUM/SYMMETRICOM Cs III
16Commercial Cesium clockOSCILLOQUARTZ 3200
17Commercial Cesium clockOSCILLOQUARTZ 3000
18Commercial Cesium clockMICROSEMI Cs 4000
19Commercial Cesium clockRHODES AND SCHWARZ XSC
21Commercial Cesium clockOSCILLOQUARTZ 3210
22Commercial Cesium clockOSCILLOQUARTZ OSA 3230B
23Commercial Cesium clockOSCILLOQUARTZ EUDICS 3020
24Commercial Cesium clockOSCILLOQUARTZ 3230
25Commercial Cesium clockHEWLETT-PACKARD 5062C
30Commercial Cesium clockHEWLETT-PACKARD 5061B
31Commercial Cesium clockHEWLETT-PACKARD 5061B OPT. 4
32Commercial Cesium clock01OSCILLOQUARTZ OSA 5585B
34Commercial Cesium clockH-P 5061A/B WITH 5071A TUBE
35Commercial Cesium clockMICROCHIP 5071A HIGH PERFORMANCE TUBE.
36Commercial Cesium clockMICROCHIP 5071A LOW/STANDARD PERFORMANCE TUBE
37Commercial Cesium clockOSCILLOQUARTZ OSA 3300
38Commercial Cesium clockChengdu Spaceon Electronics Company TA1000
40UNSPECIFIED HYDROGEN MASER
41HYDROGEN MASER10T4S iMaser 3000 ACTIVE H-MASER
41HYDROGEN MASER20MICROSEMI ACTIVE H-MASER MHM 2010
41HYDROGEN MASER31KVARZ CH1-76 PASSIVE H-MASER
41HYDROGEN MASER30KVARZ CH1-75A ACTIVE H-MASER
41HYDROGEN MASER40OSCILLOQUARTZ OSA 3700 PASSIVE H-MASER
41HYDROGEN MASER50VREMYA-CH VCH-1003A ACTIVE H-MASER
41HYDROGEN MASER51VREMYA-CH VCH-1033 ACTIVE H-MASER
41HYDROGEN MASER52VREMYA-CH VCH-1008 PASSIVE H-MASER
41HYDROGEN MASER32KVARZ CH1-95 ACTIVE H-MASER
41HYDROGEN MASER11T4S pHMaser 1008 PASSIVE H-MASER
41HYDROGEN MASER12T4S iMaser 4000
41HYDROGEN MASER53VREMYA-CH VCH-1003M ACTIVE H-MASER
41HYDROGEN MASER21MICROSEMI ACTIVE H-MASER MHM 2020
41HYDROGEN MASER54VREMYA-CH VCH-1005 ACTIVE H-MASER
41HYDROGEN MASER22MICROSEMI ACTIVE H-MASER MHM 2000/2001
41HYDROGEN MASER01ANRITSU H-MASER
42Commercial Rubidium clock10MuQuans MuClock
42Commercial Rubidium clock20SpectraDynamics cRb-Clock
50Commercial Cesium clockFREQ. AND TIME SYSTEMS INC. 4065A
51Commercial Cesium clockDATUM/SYMMETRICOM 4065 B
52Commercial Cesium clockDATUM/SYMMETRICOM 4065 C
53Commercial Cesium clockMICROSEMI 4310 B
75OPTICAL TRANSITION 27 Al+
76OPTICAL TRANSITION 171 Yb+ (octupole)
77OPTICAL TRANSITION 171 Yb+ (quadrupole)
78OPTICAL TRANSITION 88 Sr+
79OPTICAL TRANSITION 199 Hg+
87OPTICAL TRANSITION 199 Hg
88OPTICAL TRANSITION 171 Yb
89OPTICAL TRANSITION 87 Sr
92GROUND-STATE HYPERFINE TRANSITION OF133 Cs
93GROUND-STATE HYPERFINETRANSITION OF 87 Rb


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The BIPM Time Department makes no representations or warranties about the completeness, accuracy and reliability of the information.


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