For years, cesium beam frequency standards have been constantly improved so as to satisfy the increasingly stringent specification of time and frequency reference equipments. The availability of “easy to operate” instrument of reduced size and weight and of exceptional accuracy and stability provides the user with great flexibility in using cesium standards for meeting the stringent requirements of navigation, communication and timing systems.The Cesium Clock is an atomic frequency standard based on a hyperfine transition in the ground state of the cesium 133 atom. The Cesium Clock is specifically designed and produced with the latest technology in a very compact and reduced size. Taking into consideration its unique reduced volume, this offers a set of operation features and performance without comparison on the market. Available with a long life cesium tube, this will meet the requirements where performances are needed over a long period of time.

Cesium performances characteristics

  • Frequency accuracy ±1×10-12
  • Reproducibility ±1×10-12
  • Short Term Stability : ADEV
    1s 1.2×10-11
    10s 8.5×10-12
    100s 2.7×10-12
    1’000s 8.5×10-13
    10’000s 2.7×10-13
    100’000s 8.5×10-14
  • Floor 5×10-14
  • Stability: Resolution <1×10-15
    Range ±1×10-9
  • Warm-up time 45 minutes @ 25°C


  • Direct outputs:                5MHz                                               10MHz
  • Amplitude                              1Vrms 0,2@50                             1Vrms 0,2@50
  • SSB Phase
    1Hz                                          – 95dBc/Hz                                      – 90dBc/Hz
    10 Hz                                       -125dBc/Hz                                     -120dBc/Hz
    100Hz                                      -140dBc/Hz                                    -135dBc/Hz
    1’000Hz                                   -150dBc/Hz                                    -145dBc/Hz
  • Auxiliary outputs           Analog                                       Timing Outputs
    Number                                        1                                                           3
    Frequency                              0.1-50MHz                                    1PPS/1/5/10MHz
    Output level:                             Typ.500mVrms@50Ω           ≥ 3V @ 50Ω
    (min. 250mVrms)
    Output shape                          Sine                                               square or pulse
    Connector                                BNC                                                     BNC
    Synchronization input
    Number                                      2 (1x front + 1x rear side)
    Input type and connector       1PPS TTL (≥ 3V)-BNC
    Signal expansion (optional)
    Programmable analog output
    Number                                          1
    Programmable Frequency          0.1 – 50 MHz
    Output level                                   Typ.500mVrms@50Ω
    (min. 250mVrms)
    Connector                                       BNC
    Programmable Telecom outputs
    Number                                           4
    Frequency Configurable:             2.048 MHz /E1 / T1 / 1PPS / 10MHz
    Output level                                   According to G703
    Connector                                       BNC 75Ω (T1: DB-9 100Ω)
    Power Supply
    1x230VAC (88V-264VAC 50-60Hz)
    1x48VDC nominal floating (20V to 60V)
    Power feeds Dual
    Power consumption 60W @25°C (warm-up max. 70W)
    Optional battery backup
    Optional internal battery for 45 minutes of operation without power source
    Communication port
    Port: RS-232C on DB-9 (1x front + 1x rear side) for local management and / or remotely using SyncView PlusTM
    Relay contacts: 3 x alarm indication
    Front panel LED indication
    Monitoring: 6x LED’s (3x front + 3x rear) for monitoring Power Supply Status,Operation, Alarms
    Management and Clock expansion(optional1)
    Communication port
    Management Port                         Ethernet TCP/IP port on RJ45
    TOD (Time Of Day)                      1 x TOD input on DB-9 (m)
    1x TOD output on DB-9 (f) with programmable shift
    Display                                             5.7’’ tactile LCD display on front side
    19’’: 3U 132 x 436 x 400 mm (HxWxD) with rear and front access connectors. Adapters for 23’’ rack standard
    Table-top case Optional table-top case
    Weight <15kg (excluding packing)
    Environmental Conditions
    Operating conditions           EN 300 019-1-3, class 3.2 (temperature range extended from -5°C to +55°C)
    Transportation                      EN 300 019-1-2, class 2.2
    Storage                                   EN 300 019-1-1, class 1.1
    Humidity                                Up to 95%
    Altitude (operating)              0 – 15’000m
    DC magnetic field                 ±2 Gauss maximum
    Safety                                      EN 61010-1
    EMC & ESD                           EN 50081-1, EN 50082-1
    IEC                                          801 parts 2, 3, 4, 5 and 6
    CE compliant

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