BIPM Time Department Data Base

Atomic clocks participating in TAI statistics :

Total H-maserCs clockRubidiumOther
601 166403032


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
34Commercial Cesium clockH-P 5061A/B WITH 5071A TUBE
35Commercial Cesium clockMICROSEMI 5071A HIGH PERFORMANCE TUBE.
36Commercial Cesium clockMICROSEMI 5071A LOW PERFORMANCE TUBE
37Commercial Cesium clockOSCILLOQUARTZ OSA 3300
40UNSPECIFIED HYDROGEN MASER
41HYDROGEN MASER01T4S iMaser 3000 ACTIVE H-MASER
41HYDROGEN MASER02MICROSEMI ACTIVE H-MASER MHM 2010
41HYDROGEN MASER03KVARZ CH1-76 PASSIVE H-MASER
41HYDROGEN MASER04KVARZ CH1-75A ACTIVE H-MASER
41HYDROGEN MASER05OSCILLOQUARTZ OSA 3700 PASSIVE H-MASER
41HYDROGEN MASER06VREMYA-CH VCH-1003A ACTIVE H-MASER
41HYDROGEN MASER07VREMYA-CH VCH-1033 ACTIVE H-MASER
41HYDROGEN MASER10KVARZ CH1-95A ACTIVE H-MASER
42Commercial Rubidium clock09MuQuans MuClock
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